An increased water content in hydraulic systems dramatically changes the oil's characteristics. Load-bearing capacity is reduced, temperature resistance decreases, and viscosity is altered. In addition, humidity accelerates the depletion of additives and promotes the formation of foam and varnish. The consequences are far-reaching and include loss of performance, cavitation in pumps, uncontrolled valve movements, and accelerated oil aging due to oxidation.

These problems lead to reduced output, damage to components, and costly repairs. Possible causes of water ingress include radiator leaks, ambient humidity, splash water, and already contaminated fresh oil. To avoid economic damage, the oil must either be protected from water, or any existing water must be removed as quickly as possible. Effective oil dewatering can extend the service life of the entire machine up to four times.

In this article, learn about the dewatering systems ARGO-HYTOS offers for water separation in hydraulic systems and how you can significantly extend the service life of your hydraulic systems.

What dewatering systems are available for water separation, and why are they indispensable?

Various dewatering systems are available for removing water from hydraulic oil. Their application depends on the degree and type of contamination. Common methods include:

• Centrifugation
• Coalescence
• Absorption filtration
• Vacuum dehydration

Each method offers specific advantages and disadvantages in terms of efficiency, cost, and maintenance requirements.

Among the methods mentioned, vacuum dehydration in combination with specialized filter elements such as the EXAPOR®AQUA series from ARGO-HYTOS is considered the most effective solution. This technological approach makes it possible to remove both free and dissolved water and keep the residual water content extremely low. This also significantly extends the service life of hydraulic oil.

The combination of these technologies achieves optimum fluid cleanliness, reduces component wear, and increases the overall reliability of hydraulic systems.

How do EXAPOR®AQUA filter elements work to effectively separate water?

EXAPOR®AQUA filter elements enable fast and efficient dewatering of hydraulic and lubricating oils by means of absorption filtration. This technology is particularly valuable in systems that use hygroscopic oils. It is also useful in environments with permanent water ingress, such as hydraulic and other mobile machines like, construction, reach stackers, forest machinery, municipal etc..

The special feature of EXAPOR®AQUA is its dual performance. The elements consist of special water-absorbing filter layers and a micro-filter material. This effectively removes water from the oil while also ensuring the removal of solid contaminants. This allows the elements to be used even in hydraulic systems with the highest oil cleanliness requirements.

The filter elements can be used flexibly and offer the following advantages:

• Permanent protection: Built into ARGO-HYTOS offline filter units or filter systems, the elements can be permanently installed in the system to continuously remove water.
• Temporary dewatering: To remove residual water - for example, after refilling - EXAPOR®AQUA elements can also be used in portable offline filter units during service.
• Integration: On request, suction or return filters can also be equipped with EXAPOR®AQUA technology.

The efficiency of the dewatering process can be checked visually on site. As long as cloudiness is visible in the cooled oil, the water content is in most cases unacceptably high. If the oil sample appears clear, the water content is usually within the permissible range. However, an exact determination of the water content must always be carried out by Humidity sensors such as LubCos H20+ or oil analysis in laboratory.

The OPS2 vacuum drainage system: Comprehensive oil conditioning for demanding requirements

Vacuum dehydration is the most effective method for removing large quantities of water (whether free, emulsified, or dissolved). ARGO-HYTOS' mobile Oil Purification System uses this advanced technology for comprehensive conditioning of hydraulic and lubricating fluids.

The operating principle of vacuum drainage

The oil is heated to a defined temperature in the dewatering unit. It is then fed into a vacuum chamber. The negative pressure generated in the reactor causes the water to evaporate long before the normal saturation limit is reached. The resulting vapor is cooled, condensed, and collected in a collection tank. In this way, the OPS system not only removes water, but also degasses the hydraulic fluids.

Downstream, a built-in filtration module with fine filters ensures that solid contaminants are also removed. Powerful filter elements such as EXAPOR®MAX or the conductive EXAPOR®SPARK PROTECT elements can be used for this purpose.

The advantages of the OPS2 series

The OPS2 010 mobile dewatering unit offers a 20 percent increase in water removal speed. The dewatering rate for free water is typically around 1.2 liters per hour for 200 liters of oil with a water content of over 10,000 ppm.

Comprehensive process control with data management and operation

The mobile dewatering units of the OPS2 series offer complete control over the fluid conditioning process to ensure maximum reliability and transparency. The dewatering process is constantly monitored. Integrated sensors continuously measure important fluid parameters such as humidity, temperature, and conductivity during treatment.

This constant monitoring makes OPS2 a flexible device. The unit can either be controlled manually by the operator or operate in fully automatic modes with predefined settings and parameters. It is operated via an intuitively designed touch panel that clearly summarizes all settings and displays.

For data management, all measurement results are stored in the internal memory of the OPS2 system. The data can be printed out immediately during the cleaning process using the integrated printer, enabling quick documentation on site. Alternatively, the data can be copied to a USB stick at any time for further processing.

The XML format of the data allows for easy further processing in external devices. The results can also be assigned to individual profiles (e.g., specific customers or machines) to enable transparent management. These functions help to increase system availability and reduce operating costs.

The modular base system can be expanded with optional components as needed. These include a particle monitor for continuous cleanliness measurement or an additional heater to further increase dewatering efficiency.

ARGO-HYTOS: Your partner for fluid conditioning

The demands on the availability and service life of modern hydraulic systems are constantly increasing. Maintaining a high level of fluid cleanliness through reliable dewatering is an extremely important factor in this regard. Given the negative effects that water has on the chemical integrity and performance of hydraulic oil, consistent dewatering is essential.

Efficient oil conditioning can increase the service life of components up to fourfold, thereby drastically reducing operating costs and downtime. ARGO-HYTOS offers customized and integrated solutions with its EXAPOR®AQUA absorptive filter elements and powerful OPS2 vacuum drainage systems. These solutions maximize the reliability, efficiency, and service life of your hydraulic systems.

Do you want to optimize your machine platforms, minimize risks, and increase operational safety? Then we are at your side as a partner for project development and application-specific engineering. Get in touch with our experts! They are available for personal consultation on ARGO-HYTOS solutions with no obligation.

However, they only work effectively if selection, installation, and maintenance are precisely coordinated. In this article, you will learn

• which criteria are decisive when selecting a filter element,
• how to monitor the condition of the filter correctly, and
• which maintenance intervals ensure the operational reliability of your hydraulic systems.

The objectives are to achieve consistently high oil cleanliness, maximum service life, and trouble-free plant operation.

Clean oil as basis for reliable hydraulic systems

In every hydraulic system, performance depends directly on the cleanliness of the fluid used. Filter elements perform the key task of removing solid particles from the oil, thereby protecting pumps, valves, and cylinders from premature wear. Even the smallest contaminants can cause friction, leaks, or loss of performance in fine control gaps, thereby impairing the entire process.

Filtration ensures that the required oil cleanliness is maintained and that the system remains fully functional. It therefore not only contributes to the longevity of the components, but also to the energy efficiency of the system. This is because a clean oil flow is more consistent, and pressure losses are reduced.

There are basically two types of filter elements in hydraulics:

• Depth filters
• Surface filters

Depth filters consist of a fiber mesh (made of glass or polyester fibers, for example) and separate particles within the filter structure. They are characterized by high retention capacity but cannot be cleaned.

Surface filters work with precisely defined mesh openings (usually made of metal or plastic mesh) that retain larger particles on the surface. This design allows for cleaning and multiple use.

How are filter elements constructed in hydraulics and how do they work?

Filter elements in hydraulics are complex components whose performance depends on the right combination of several layers. Each layer fulfills a specific task: pre-filter layers retain coarser particles, while finer layers separate the smallest contaminants. Support and protective fabrics stabilize the pleated structure, prevent the filter layers from sticking together, and ensure the free flow of oil.

This multi-layer design ensures that the oil flows evenly through the element. In addition, the differential pressure remains as low as possible throughout the entire life cycle. Mechanical stability is ensured by precisely bonded end edges that prevent fibers from escaping. Metal support tubes are laser-welded using modern processes to permanently strengthen the structure.

Important parameters for the operation of filter elements in hydraulics are differential pressure stability and flow fatigue resistance. Return filters can withstand differential pressures of over 10 bar, while pressure filters can withstand loads of more than 20 bar. With changing loads, the high fatigue resistance ensures that the filter element remains dimensionally stable even after millions of load cycles. In addition, it maintains its filtration performance consistently over its entire service life.

Selection criteria for the correct filter design

The selection of a suitable filter element is based on clearly defined technical parameters. The filter fineness, which specifies the particle sizes that are separated, plays a central role. It is specified in micrometers (approximately 5, 10, or 16 µm) and depends on the sensitivity of the components to be protected.

The beta value (β value) describes the ratio of the number of particles before and after the filter element. A beta value of 200 means that out of 200 particles of a certain size, only one particle passes through the filter barrier. Thus, β = 200 corresponds to a separation efficiency of 99.5%. This key figure enables an objective evaluation of the filter performance.

Closely related to this is the separation efficiency (η), which quantifies the filter's ability to retain particles of a defined size. Together with the beta value, it provides a basis for determining the oil cleanliness in the system.

Dirt holding capacity and service life are also crucial for practical operation. The dirt holding capacity describes how many particles the filter element can retain before the maximum permissible differential pressure is reached. The service life refers to the operating time up to this point. Both values depend on the volume flow, viscosity, and degree of contamination of the oil.

In addition, the differential pressure stability is important. It shows how resilient the filter structure remains when the back pressure increases. Insufficient stability can cause the filter medium to collapse and unfiltered oil to enter the circuit. Therefore, the operating conditions (pressure, temperature, and flow rate) should always be considered when making your selection.

What does maintenance and servicing of filter elements in hydraulics involve?

The performance of filter elements in hydraulics depends directly on consistent maintenance. The condition of the filter element can be determined by the differential pressure, which increases as the load increases. A clogging indicator on the filter signals when the preset limit value has been reached – either visually via a display window or electrically via a sensor signal.

For filters with a clogging indicator, the filter elements are replaced based on their condition. Replacement is only necessary when the indicator responds continuously at the normal operating point, i.e., at operating temperature and nominal volume flow. A brief signal when the oil is cold can be ignored, as the increased viscosity temporarily leads to higher pressure loss.

Filters without clogging indicators are serviced preventively. It is recommended that they be replaced after approximately 1000 operating hours or at least once a year. The same interval applies to ventilating filters, which are replaced rather than cleaned due to environmental influences.

Surface filters, on the other hand, can be cleaned and reused several times. To do this, they are treated in an ultrasonic bath for a few minutes or immersed in cleaning fluid for about 15 minutes. The loosened dirt is then removed from the outside. The element is then rinsed from the inside out with clean fluid and blown out with compressed air. This procedure can be repeated up to three times.

Suction filters without a seal to the environment can be cleaned regularly to ensure low differential pressures. Models with a seal, on the other hand, should be replaced at least every 2000 operating hours or every two years. This is because the seals lose their elasticity over time.

Safe operation through consistent maintenance

A reliable maintenance schedule ensures that filter elements perform their function without interruption. If a filter is changed too late, the differential pressure increases significantly. This can cause the integrated bypass valve to open, allowing unfiltered oil to enter the circuit – with corresponding consequences for sensitive system components.

The combination of preventive and condition-based maintenance allows optimal utilization of the dirt holding capacity while minimizing the risk of downtime. A permanently stable differential pressure is associated with consistent filtration performance and protects the system from unnoticed contamination.

During each maintenance check, seals, O-rings, and housing connections should be inspected and replaced if necessary. The filter system will only remain permanently sealed if the sealing surfaces are clean and mounted without tension. It is equally important to use approved spare parts, as only these can guarantee the specified filtration performance and mechanical stability. Replica components can deform under load or be subjected to uneven flow, which significantly reduces the filtering effect.

A regularly maintained filter system not only ensures oil cleanliness, but also the cost-effectiveness of the entire hydraulic system. Reduced downtime, extended oil change intervals, and a longer service life for components are direct results of proactive maintenance.

Your contact to our experts

The selection and maintenance of filter elements requires technical understanding and experience with the system parameters. ARGO-HYTOS supports you in defining suitable filter finenesses, determining maintenance intervals, and designing complete filtration concepts for hydraulic and lubrication systems.

If you want to increase the reliability of your machines and extend the service life of your hydraulic components, we recommend regular inspection of your filter system. Ensure long-term operational reliability through professional filter maintenance and the correct selection of your filter elements!

Contact the experts at ARGO-HYTOS for individual advice - for permanently clean oil and maximum system availability.

This transformation requires our customers to fundamentally rethink their machine concepts. Our role is to provide them with the right tools in the field of hydraulic system solutions. Many of these tools are innovations developed by ARGO-HYTOS.

How do you define “innovation” in the context of your company?

Innovation is a core element of our corporate strategy. It determines whether we will still meet market demands in the future. While our current portfolio addresses today’s needs, innovation must anticipate and meet the requirements of tomorrow.

We take a holistic approach to innovation, considering all relevant areas: product, process, and business model. For example, we develop new manufacturing technologies to make our products more efficient and sustainable. At the same time, we work on products with enhanced functionalities – enabled by modern software and hardware – and explore new business opportunities, such as those arising from the increasing electrification of the off-highway sector. In doing so, we also benefit from the expertise of our parent company, VOITH.

How is innovation structured within your organization?

We have established structured innovation processes that combine creativity with clear workflows. Ideas are systematically generated, evaluated, and implemented – always with a strong focus on customer value. Our innovation efforts thrive on the dynamic interplay between internal expertise and external inspiration. Collaboration with VOITH colleagues amplifies our capabilities and accelerates innovation. In addition, start-ups, academic institutions, suppliers, and customers actively contribute to shaping our innovation landscape. The key principle for us is “Innovate to the needs” – aligning our solutions precisely with customer requirements.

We also foster an innovation-friendly culture that encourages employees to contribute ideas. Of course, dealing with setbacks is part of the process: not every invention becomes an innovation. We analyze failed projects, learn from them, and continuously improve our success rate. And yes – alongside a good idea and targeted execution, a bit of luck is sometimes needed.

What skills are particularly in demand today?

Today, even traditional hydraulics companies must address new topics: e.g. electrification, sensor technology, software development, functional safety, and artificial intelligence. The demands are growing steadily, and we are investing specifically in building these competencies.

AGRITECHNICA is just around the corner. What are your expectations for the trade fair?

AGRITECHNICA is the world’s leading trade fair for agricultural technology and a key driver of innovation. Its location in Hanover highlights the importance of the industry within the European economic landscape. I expect exciting impulses related to the major industry trends: sustainable machine concepts, digitalization, automation, and process optimization.

How is ARGO-HYTOS responding to these trends? What solutions will you be presenting?

We offer innovative solutions that deliver real added value for our customers. Let me give you a few examples.
Our AirEx technology for filters enable faster oil deaeration, which reduces tank size and oil volume – a clear contribution to resource conservation.
With SHC 2.0, we offer an advanced boom guidance system for field sprayers, laying the foundation for precise and demand-driven application of crop protection agents and fertilizers.

In the field of digitalization, we differentiate between products with digital features and general digital services.
Our LubCos sensors and OPCom Particle Monitor series use machine learning for condition monitoring and predictive maintenance. The EL7 electronics set new standards in valve control and data transmission via CAN, Bluetooth, or analog interfaces.
We support the FLUID 4.0 movement and the use of standardized digital twins. Through the “Asset Administration Shell,” customers can optimize processes, avoid errors, and reduce energy consumption and CO₂ emissions.
With our MHPS system – a modular solution for hydropneumatic suspension – we enhance operator comfort for agricultural machinery.
In the area of drive systems, we focus on alternative concepts supported by clever (decentralized) hydraulic supply (HPoD) and high-performance components such as PRM8 valve technology. 

What message would you like to share with AGRITECHNICA visitors?

Visit us in Hall 17 Booth D13 and let’s talk about the future of your machines. We look forward to engaging in meaningful conversations and developing new solutions together.

Finally, how do you envision the future of hydraulics?

In my opinion the future of hydraulics is digital, sustainable, and intelligent. Technologies such as digital twins, energy-efficient hydraulic solutions, additive manufacturing, and predictive maintenance will fundamentally reshape the industry. They open up new application possibilities, enhance system performance and efficiency.

A pressure reducing valve lowers the system pressure in the partial circuit and keeps it constant. This protects components, increases process stability, and improves the efficiency of the overall system.

In the proportional version, the function goes one step further. The pressure downstream of the valve is not set mechanically but is controlled by an electrical signal. This allows for continuous adjustment – dynamically, precisely, and in real time. This is indispensable, especially in applications with variable loads.

Whether in mechanical engineering, mobile machinery, or test benches, proportional pressure reducing valves create the basis for precise movements, reproducible processes, and a long service life for hydraulic components. ARGO-HYTOS offers a wide range of products for this purpose, from compact direct-acting variants to powerful pilot-operated valves with integrated electronics.

What is the function of pressure reducing valves in hydraulics?

Pressure reducing valves regulate the pressure in a section of a hydraulic system to a defined value. They thus ensure the supply to consumers that may only be operated at reduced pressure.

While pumps and main circuits are often designed for high pressure levels, cylinders, motors, or control blocks often require lower values in order to operate reliably and with low wear. Without this control, overloads would occur that would damage components and jeopardize the stability of the system.

A classic pressure reducing valve works mechanically by throttling or shutting off the oil flow when the set pressure is reached. In the proportional version, this function is enhanced by an electrical input signal. The output pressure adjusts continuously depending on the signal strength. This allows pressures to be flexibly and dynamically adjusted to changing load situations.

This technology is used in particular in mechanical engineering, mobile machinery, test benches, and proportional hydraulics. Typical applications include clutch controls, clamping systems, and consumers with variable pressure requirements. Proportional pressure reducing valves increase the service life of sensitive components, improve process quality, and contribute significantly to the energy efficiency of modern hydraulic systems.

What is the difference between direct-acting and pilot-operated pressure reducing valves?

Directly controlled proportional pressure reducing valves have a simple design. The electromagnet acts directly on the valve cone or slide. The electrical input signal determines the magnetic force, which in turn influences the opening of the valve. The advantages of this design are its fast response and compact construction, which are particularly impressive for small and medium volume flows. The limitation lies in the flow capacity, which is restricted as requirements increase.

Pilot-operated valves, on the other hand, consist of a pilot stage and a main stage. The pilot stage controls the control pressure that moves the main piston. This allows larger volume flows to be regulated and greater accuracy to be achieved. Due to their more complex design, they are ideal for demanding applications with high performance requirements. Both valve types are available in versions with external control electronics or with integrated electronics.

The plug-and-play solution integrates signal processing and diagnostic functions directly into the valve housing. This simplifies installation, reduces cabling requirements, and enables direct integration into control systems. ARGO-HYTOS offers both designs, covering the entire spectrum from compact standard valves to powerful precision solutions for large-scale systems.

How does signal-controlled pressure regulation work?

The function of a proportional pressure reducing valve is based on control by an electrical input signal. This signal generates a magnetic force that acts directly on the valve mechanism. Depending on the strength, the opening cross-section through which the oil flows into the secondary circuit changes.

The valve is open when de-energized. The oil then flows unhindered over the control edge into the consumer circuit. As soon as the target pressure is reached on the consumer side, the control edge closes and interrupts the oil flow. In this way, the desired pressure builds up in the secondary circuit and remains constant, even if higher values prevail in the main circuit.

Feedback systems are used to stabilize and control pressure. When the pressure reducing valve is closed (e.g., because the secondary pressure has been reached), pressure can continue to build up in the valve's control chamber. A feedback system returns this pressure to the tank or to the low-pressure side to prevent overload. By returning the control oil flow, the control pressure is kept constant, resulting in more precise pressure control. This increases accuracy and response speed and is particularly important in sensitive applications.

Especially in dynamic processes such as clutch engagement or fast clamping operations, these features ensure maximum reliability and process quality.

Why are precision and dynamics crucial factors for pressure reducing valves?

In modern hydraulic systems, consistent process quality, energy efficiency, and operational safety are key requirements. Proportional pressure reducing valves contribute to this by precisely adjusting the output pressure to the requirements.

This is particularly important when sensitive actuators have to be operated within a narrow pressure range. Precise control prevents unnecessary wear and tear and increases the service life of the components.

Dynamic behavior is equally crucial. Valves from ARGO-HYTOS are characterized by short response times and low hysteresis. This allows even fast load changes or transient processes, such as when controlling clutches, to be reliably controlled. This ensures stable processes and prevents pressure peaks that would put strain on the systems.

In addition, the valves are designed for integration into modern control concepts. They are compatible with PLCs, industrial controllers, and networked Industry 4.0 environments. Interfaces such as CANopen or analog signal paths enable direct integration into automated systems. Diagnostic functions support predictive maintenance. This makes proportional pressure reducing valves a key technology for the automation and digitalization of hydraulic applications in mechanical engineering, industry, and mobile hydraulics.

Overview of the advantages of proportional pressure reducing valves

• Stepless, dynamic pressure control via electrical signal
• Protection of sensitive consumers through constant pressure reduction
• High accuracy thanks to feedback and closed control loops
• Fast response and low hysteresis for variable loads
• Available in direct and pilot-operated designs
• Variants with integrated electronics for easy integration
• Compatible with PLC and Industry 4.0 environments

What is the practical significance of proportional pressure reducing valves?

Proportional pressure reducing valves ensure that subcircuits are supplied with precisely defined pressures. This is independent of the supply pressure in the main circuit. This allows complex systems with multiple parallel functions to be implemented without the need for additional pumps or power units. Typical areas of application are:

• Construction machinery
• Agricultural equipment
• Test benches
• Industrial manufacturing equipment

In construction machinery, for example, they precisely control the steering or auxiliary hydraulics. In agricultural engineering, they protect attachments from overload. On test benches, they enable defined pressure curves for test series. In industry, they ensure process quality in injection molding machines, presses, or machine tools.

Thanks to their precision, dynamics, and flexibility, they help to save energy, reduce wear, and increase machine availability. With solutions such as PP2P3-W3 and SP4P2-B3, ARGO-HYTOS offers efficient solutions that meet practical requirements in all areas.

ARGO-HYTOS: Your partner for precise pressure control

Proportional pressure reducing valves combine protection, precision, and efficiency in a single component. They regulate pressures in subcircuits, prevent overloads of sensitive components, and increase the stability of the entire system. Thanks to continuous, signal-controlled adjustment, pressures can be controlled dynamically. This is a basic requirement for modern machines in the age of automation.

ARGO-HYTOS offers direct-acting and pilot-operated designs (optionally with integrated electronics), covering all areas of application from mobile equipment to industrial plants. Machine builders and operators benefit from durable, robust, and precise solutions that improve both process reliability and efficiency. Would you like to learn more or discuss a specific project with us? Then get in touch with our experts.

• how reliably hydraulic systems operate,
• how clean the medium remains.

In the design of modern machines and systems, the tank is not considered in isolation, but as part of an overall system. Factors such as space availability, weight, oil volume, and ease of maintenance play just as important a role as requirements for efficiency and durability. Even small differences in design can have a noticeable impact on system performance.

This means that developers are focusing more closely on the hydraulic tank. It is no longer viewed as a simple container, but rather as a complex component that influences energy consumption, service intervals, and operating costs. The following article shows which design principles, technologies, and details determine this influence.

Injection Molded Tank or Hybrid Tank: Differences in the Manufacturing Concept

In hydraulic systems, tank design is increasingly decisive for efficiency and operational safety. The tank is not only an oil reservoir, but also has a direct effect on flow behavior, air separation, and the cleanliness of the medium. Two design principles have become established for mobile applications:

• the fully injection-molded tank
• the Hybrid Integrated Tank (HIT)

Both are based on high-performance plastics such as polyamide, but differ in terms of manufacturing process, functional integration, and area of application.

Injection-molded tanks are made from glass fiber-reinforced plastic, which is processed into a homogeneous housing in molds. The process delivers high dimensional accuracy and repeatable quality, which is a major advantage, especially in series production with large quantities. At the same time, injection molding allows for very precise integration of various functions such as filter housings, oil baffles, connections, and mounting points.

This design is particularly suitable for compact systems with medium volumes and clearly defined interfaces. Due to the necessary injection molding tools and the associated investment costs, it is particularly economical for larger quantities.

The hybrid tank combines rotational molding technology with injection molded parts. The rotationally molded base body provides high volume capacities and mechanical stability, while strategically placed injection molded modules perform functions such as filter housings, quick-connect fittings, or oil level gauges.

This combination opens up design freedom, as modules can be positioned or added variably without the need for new basic tools. The number of external interfaces is significantly reduced, which minimizes the risk of leaks and simplifies assembly. Thanks to the choice of materials (high-performance plastics), the tank remains dimensionally stable even at temperatures up to 100 °C. This makes it suitable for heavy-duty mobile machines.

This means that two solutions are available to meet different requirements:

• Injection molding for standardized series with high-cost pressure for larger quantities
• Hybrid for larger tank volumes, higher thermal loads, and diverse machine platforms, even for smaller annual quantities.

In both cases, the tank is transformed from a static reservoir into an integral system component that makes a decisive contribution to overall performance.

How does air separation affect the size of the hydraulic tank?

The air content in hydraulic oil has a direct impact on the stability and efficiency of the entire system. Air bubbles alter the compressibility of the medium, lead to pressure fluctuations, and impair the response behavior of pumps and actuators. At the same time, noise levels increase and there is a higher risk of cavitation.

In addition, oxygen ingress, among other things, accelerates the aging of the oil, which shortens its service life and increases operating costs. In classic designs, this problem is mitigated by large tanks. A higher oil volume ensures longer dwell times, allowing air bubbles to rise and escape. However, this method is space- and resource-intensive: large containers mean more installation space, higher weight, greater oil requirements, and ultimately higher costs.

This is where ARGO-HYTOS' AirEX system comes in. A special flow guide in the return filter combines individual air bubbles into larger bubbles, which separate from the oil more quickly. In addition, targeted flow calming reduces turbulence when entering the tank. In practice, this significantly reduces the air content, and degassing is up to 70% faster than with conventional return filters.

As a result, the required tank volume can be reduced by up to 50% without compromising operational safety. This saves oil, weight, and installation space, and creates design freedom for other assemblies. AirEX modules are available in both top-entry and bottom-entry versions and can be integrated into ARGO-HYTOS tank systems.

What role does functional integration play in hydraulic tanks?

The classic tank with separate attachments for filters, filler necks, ventilation, and oil level control is hardly competitive anymore. Modern systems rely on complete functional integration within the tank module. The direct integration of return filters, ventilators, filling strainers, oil drain valves, and suction strainers not only saves space. It also drastically reduces the number of potential leakage points.

For example, the filter system is housed directly in the tank body, eliminating the need for external sealing surfaces. This is complemented by an internal baffle plate that calms oil movements and further promotes degassing. Integrated oil level gauges provide reliable information on the filling status without the need for external sensors. Optionally, electronic or optical contamination indicators can be added for filter monitoring, allowing condition-based maintenance. Optional electronic or optical clogging indicators can be added for filter monitoring, allowing condition-based maintenance.

What are the benefits of Quick-Connect for hose assembly?

When installing hydraulic hose lines, screw connections are still a frequent source of errors – whether due to insufficient tightening torque, tensioning, or leakage after vibration. Quick-connect couplings circumvent this problem with a tool-free, releasable connection technology that is easy to visually inspect. A retaining clip ensures that the connection is locked in place, while at the same time allowing the connection to rotate and facilitating tension-free installation.

The system really comes into its own in confined installation conditions. The connections can be reliably closed even in areas that are difficult to access. The material is robust, temperature-resistant up to +120°C, and suitable for both mineral oil-based and biodegradable hydraulic fluids. Electrically conductive variants are available if required to prevent electrostatic discharge in the system.

How do material selection and temperature behavior affect system performance?

ARGO-HYTOS uses high-performance plastics with high thermal stability for its tanks. Variants such as PA6GF30 offer a wide operating temperature range from -30°C to +100°C, and even up to +120°C for short periods. This property allows operation even under demanding thermal conditions – for example, in mobile machines with high power density and harsh operating conditions.

Compared to metal tanks, the low specific weight of plastics also reduces the system weight. This offers advantages in terms of emissions and payload, especially in mobile applications. Chemical resistance to biodegradable hydraulic oils (HEES, HETG) is also ensured. Complemented by precisely manufactured O-ring seals, the system remains permanently leak-tight even under changing temperatures.

Important system advantages at a glance

• Ready-to-install complete modules with integrated functions
• Reduced tank volume thanks to AirEX filter technology with improved air separation
• Minimized risk of leakage due to elimination of external sealing surfaces
• Efficient hose installation thanks to tool-free quick-connect system
• Lower system weight with high thermal load capacity
• Optional functions: clogging indicators for filters, oil drain valves, dipsticks, temperature sensors

How does the hydraulic tank affect the overall performance of a system?

An efficiently designed tank acts as a system component, not as a passive container. It ensures continuous deaeration of the oil, thereby protecting the pump from cavitation. Thanks to integrated filtration, the oil is cleaned directly as it enters the tank. This extends the service life of downstream filter units.

Flow simulations during tank development ensure optimized inflow and distribution of the oil in the tank and prevent dead zones.

Developing customized tank solutions

growing — and with them the importance of well-designed tanks. If you want to increase performance, ease of maintenance, and system reliability, modular plastic tanks with AirEX and Quick-Connect offer a scalable solution. ARGO-HYTOS has the experience, technology, and system expertise to implement precisely these solutions for your specific project.

If you want to optimize your machine platforms, talk to us. Together, we will develop tanks that are precisely tailored to your hydraulic systems. Get in touch with us now!

ARGO-HYTOS has been producing tank-mounted return filters with integrated ventilating filters since 1971. And this innovation continues to set standards today. The filters perform several tasks simultaneously:

• They protect components from contamination.
• They prevent oil foaming through correctly guided return flow.
• They increase the operational reliability of the entire system.

Thanks to their modular design, integrated bypass valves and variable connection solutions, they can be flexibly integrated into a wide variety of hydraulic concepts – whether in mobile machines or stationary systems.

What is a return filter?

A return filter is a special filter. It is installed in the return line of hydraulic systems to clean the returning hydraulic oil before it is returned to the tank. From a technical point of view, it is a working filter that operates in full flow.

This means that the entire return flow volume passes through the filter element without any partial flow being bypassed. Its main task is to reliably remove dirt particles such as metal abrasion, seal residues, production residues or externally introduced contaminants.

The return filter thus acts as the last barrier before the oil storage tank and prevents contaminated medium from re-entering the circuit. A return filter thus fulfils two key protective functions. On the one hand, it protects downstream components such as pumps, control blocks and valves from wear. On the other hand, it protects the system from long-term contamination, which would increase uncontrollably due to circulating particles.

Modern return filters consist of

• a filter housing,
• a replaceable filter element (usually made of glass fiber fleece, paper or metal mesh)

and additional functions such as integrated tank ventilation, clogging indicator or oil separator complement the functional design.

Compared to suction or pressure filters, the return filter operates at lower pressures. This allows finer filter elements to be used without causing cavitation in the inlet or excessive pressure losses in the system. The result is high oil cleanliness with low flow resistance.

Which parameters are crucial for return filters?

The size of a return filter must never be determined solely based on the pump capacity. The decisive factor is the maximum volume flow that can occur in the system return. Depending on the application, this can exceed the pump flow rate many times over. Particularly in the case of differential cylinders with a large surface ratio between the piston and piston rod sides, the return flow can be up to four times greater than the pump flow.

A practical example to illustrate this: a cylinder with a diameter of 80 mm and a piston rod with a diameter of 56.57 mm generates a return flow of 80 l/min with a stroke of 800 mm – with a pump flow rate of only 40 l/min. If this maximum value is underestimated when designing the filter, dangerous back pressures can occur in the system.

Excessive back pressure in the return flow not only endangers the pump, but also the seals of hydraulic motors or pistons. This is particularly critical when leaking oil lines are connected. The permissible back pressure must not overload the respective sealing systems of the components, such as shaft seals or piston seals. This can also result in the unintentional extension of cylinders, for example due to back pressure effects.

The installation position of the return line is also crucial for stable return of the oil to the tank. The oil outlet must always be below the oil level to prevent foaming. If the return line is extended into the interior of the tank, a distance of at least two to three times the pipe diameter from the tank bottom should be maintained. This prevents settled particles from being stirred up and stabilizes the flow.

What are the advantages of the ARGO-HYTOS return filter concept?

ARGO-HYTOS return filters are designed not only to perform the filtering process, but also to fulfil several system-relevant tasks at the same time. The concept focuses on the complete cleaning of the entire return volume using the so-called full-flow principle.

In return flow filters, the hydraulic oil generally flows from the outside to the inside through the filter element. In the RFI series of return flow filters, however, the flow direction is reversed – the oil flows from the inside to the outside. This calms the oil flow. In conjunction with large-dimensioned outlet openings, this results in very low outlet velocities of less than 0.5 m/s. The oil enters the tank close to the surface and below the oil level, which improves air separation and reduces the tendency for oil foaming.

Another advantage of the RFI series is its compact design. The filter inlet is located at the bottom of the filter bowl and can be connected either from below or via a side pipe bend. Only the cover remains on the top of the tank – a plus in terms of clarity and access during maintenance work.

The filter cover can be opened without special tools. Depending on the series, an integrated holder ensures precise guidance of the element. Depending on the filter type, the bypass valve can also be integrated into the filter element itself. This prevents sedimented dirt from entering the tank from the housing when the bypass is opened.

Depending on the application, the filter modules can be equipped with a variety of additional functions, such as:

• Integrated tank ventilation filter with 2 micrometer filter fineness
• Oil separator to prevent spillage losses
• Optical or electrical clogging indicators
• Pipe extensions for guided oil return

The available filter elements cover a wide range of fineness from 5 to 100 micrometers. Depending on requirements, they are available in glass fiber fleece, paper or stainless-steel versions.

The advantages of ARGO-HYTOS return filters at a glance

• Full-flow filtration to protect pumps and valves by systematically removing dirt particles
• Smooth return flow thanks to sophisticated flow control and large outlet openings
• Easy maintenance thanks to removable bowl, tool-free cover and integrated indicators
• In certain series, the bypass valve is integrated into the filter element. This design directs the bypass flow past the element and prevents contaminants deposited at the bottom of the housing from mixing back into the oil flow.
• Modularity for every system requirement: pipe extension, outlet diffuser, second return connection and much more.

What types of return filters does ARGO-HYTOS offer in detail?

The ARGO-HYTOS return filter portfolio covers a wide range of applications. It ranges from compact solutions for small volume flows to high-performance filters for industrial hydraulic systems with up to 960 liters per minute. The range distinguishes between tank-mounted filters and variants for line and tank installation.

Both versions have a removable filter bowl. During servicing, this is removed together with the element, which significantly reduces the risk of recontamination from dirt deposits in the housing.

In the lower performance range, for example, the E 043 type offers a compact solution for applications up to 35 l/min with a G½ thread connection. The filter is equipped with an aluminum housing and plastic cover and can be optionally supplemented with a visual or electrical clogging indicator.

Variants such as type E 072 and type E 103 are available for medium volume flows. Both are designed for tank installation and are optionally equipped with a ventilation filter, oil dipstick and integrated oil separator.

For applications with higher return flow requirements, the range includes the E 222, which can handle return flows of up to 220 l/min. Additional functions such as a second return connection or a filling filter can be integrated.

The E 703 type is used in the high-performance range. This variant is designed for maximum flows of up to 900 l/min. It has flange connections and large steel filter bowls and can be equipped with an outlet diffuser and several return connections.

In the new RFI series, such as the RFI 206, the oil flows from the inside to the outside through the filter element. Large outlet openings keep the outlet velocity low and promote the degassing of air. The entire filter insert is located in the tank cap, with only the cover remaining visible. This ensures a compact design, a tidy tank surface and makes servicing much easier.

The RFT-150 is also available as a robust tank mounting variant. It is designed for return flow rates of up to 180 l/min and combines full-flow filtration with a compact 4-hole mounting. The lower part of the housing, including the filter element, can be completely removed for servicing, which reduces downtime and prevents recontamination.

All filter types are characterized by modular expandability, high ease of maintenance and robust materials. They are tailored to the specific requirements of mobile machinery and industrial hydraulic systems.

What are the specific benefits of using a return filter for your system?

A correctly dimensioned return filter is a key element for trouble-free operation. Its effectiveness is not only evident in clean oil. Significantly extended maintenance intervals, lower energy consumption thanks to friction-optimized components and demonstrably increased system availability are also good arguments.

For OEMs, this means:

• Lower complaint rates
• More stable process quality
• Measurable increase in the value of your own machine

For operators, this means:

• Predictable maintenance
• Reduced downtime
• Long-term stable hydraulic system

Discover ARGO-HYTOS return filters now

Would you like to learn more about optimal return filtration in your hydraulic system? Or do you need assistance with dimensioning and selecting a suitable return filter? Our experts will be happy to help you. Visit our contact page and arrange a consultation. With ARGO-HYTOS, you can rely on decades of expertise in filtration technology – for durable, efficient and safe hydraulic systems.

The focus is on consistently designed modules that can be seamlessly integrated into existing machine architectures – both mechanically and in terms of control technology. Predefined interfaces, compact geometries, and flexibly combinable assemblies enable short development times, easy installation, and consistently stable system performance. At the same time, the effort required for wiring, piping, and commissioning is significantly reduced.

ARGO-HYTOS supplies ready-to-connect solutions that are designed for specific requirements and are immediately ready for use. Here are some examples of applications:

• Spray boom control in agricultural engineering
• Safety hydraulics for earth-moving machines
• Load-dependent control for changing operating profiles

The following article shows how such system solutions can be implemented in practice and what added value they can generate in daily operation.

What makes integrated system solutions for hydraulics effective?

ARGO-HYTOS is specialized in developing functional complete solutions whose individual components are precisely coordinated with each other. Integrated system solutions for hydraulics combine control, sensor technology, valve technology, and fluid management into a precisely regulating system. This transforms hydraulics from a power transmission system into an intelligent controller that is tailored to the actual load requirements, environmental conditions, and applications.

The modular design of the solutions makes it possible to implement customer-specific requirements without costly new developments. Instead of heterogeneous isolated solutions, a consistent, maintenance-friendly system is created that saves space, reduces weight, and massively increases energy efficiency. At the same time, both commissioning times and the risk of system incompatibilities are reduced.

ARGO-HYTOS relies on pre-developed function modules that can be reconfigured depending on the application – with a significantly reduced time-to-market. It is important to note that not only technical components, but also control and safety logic are integrated into the design.

OEMs and system integrators thus receive reliable packages that have already been thought through in terms of practicality during development and documentation. This reduces development risks and creates freedom. How does the Spray Height Control System ensure precision in agriculture?

The Spray Height Control System (SHC) was developed to optimally control the application of pesticides and liquid fertilizers under changing field conditions. The integrated system solution combines ultrasonic sensors, hydraulic lifting mechanics, and an intelligent control unit.

The sensors continuously measure the distance between the spray nozzle and the plant surface – even when the vehicle is swaying or on uneven terrain. The real-time data is forwarded to the central ECU, which adjusts the spray boom height in milliseconds. This keeps the distance to the plant constant, which is one of the key factors for uniform distribution and minimal loss of product.

The result is lower resource consumption, significantly reduced environmental impact, and consistently high effectiveness. The system can also switch between different driving modes – for example, for slopes, edge zones, or parcel changes. This eliminates the need for constant manual intervention by the machine operator.

In addition to its precise control, the SHC impresses with its robustness. The fully enclosed sensor system is dust- and splash-proof in accordance with IP67 and designed for continuous use in the field. In combination with other modules such as load-sensing valves or filter systems, the SHC can be integrated into existing machine architectures as a scalable complete solution. It is completely ready to connect and can be expanded at any time as needed.

What safety functions does the HS-BR brake release block perform?

The HS-BR brake release block offers a highly secure, ready-to-connect solution for mobile machines with hydraulically vented spring-applied brakes. The compact module enables controlled brake release even when hydraulic pressure from the main system is not available. This is useful in the event of machine downtime or emergencies, for example.

Three versions of the brake release block are available:

• with integrated hand pump system
• with priority valve
• with automatic reset

The module handles the entire safety logic, including valve control, pressure accumulator connection, and optional signal transmitter. As soon as the block is activated, it independently builds up the pressure required for brake release. It complies with ISO 3450, the central safety standard for earth-moving machines.

Its compact design allows the brake release block to be installed even in confined spaces. Thanks to factory pre-assembly, installation effort is significantly reduced. Patented components and CE-compliant documentation ensure maximum system stability.

The HS-BR is a typical example of the system solution approach taken by ARGO-HYTOS. Hydraulics, control, safety, and operation are combined in a single module. This module is functionally tested and ready for immediate use, and is delivered to end users with an integrated redundancy concept.

What makes the modular hydro-pneumatic system so versatile?

The modular hydro-pneumatic system (MHPS) from ARGO-HYTOS combines the advantages of hydraulic power transmission with the energy storage capacity of pressure accumulators. This combination produces progressive damping characteristics that dynamically adapt to load changes, speed, and direction. MHPS provides greater comfort, better driving stability, and less wear, especially in vehicles or equipment with variable loads.

The system consists of preconfigured modules – such as hydraulic accumulators, proportional pressure control valves, sensors, and compact connection housings. These modules can be combined depending on the application – from small linear units to multi-axis gantries. Integration is achieved via defined mechanical or hydraulic interfaces.

Sensors record movement profiles in real time and adjust the pressure conditions in the system. The electronics communicate via CANopen or SAE J1939 and can be easily integrated into existing control concepts.

A smaller solution (MSC) is also available as an option for simple applications. MHPS is an example of a scalable modular system that offers maximum flexibility and maximum safety. At the same time, it can be deployed without any development effort.

What other integrated system solutions for hydraulics increase energy efficiency?

In hydraulic engineering, efficiency gains are achieved through measures such as optimizing the volume flow. The Modular Load Sensing System from ARGO-HYTOS supplies only as much oil as the machine actually needs.

To do this, it uses a pressure sensor to detect the highest load pressure in the system and regulates the pump's flow rate via control blocks and electronic modules.

This principle saves fuel, reduces oil temperatures, and extends the service life of components. Modular Load Sensing is ideal for machines with changing movement requirements, such as telescopic loaders, forestry machines, or municipal vehicles.

The control blocks used can be adapted and expanded to suit specific applications. A typical system consists of:

• Pressure sensor
• Electronic evaluation device
• Control block with proportional valves
• Interfaces to the vehicle control system

This elegantly solves the balancing act between dynamic performance and resource-efficient operation. For systems with even higher dynamics, we recommend combining them with power-on-demand units or electronic controls from the ARGO-HYTOS portfolio.

Which supplementary modules round off the system portfolio?

At ARGO-HYTOS, system solutions always mean thinking in terms of functional chains rather than individual components. Two key areas complete this principle:

• System filtration: With HIT tank, Quick Connect, and integrated filtration, oil cleanliness, storage, and transport can be considered as a single unit. Return filters, suction filters, and particle counters are combined in such a way that they reduce cleaning intervals and ensure fluid quality throughout the entire life cycle.
• Hydraulic power units & power on demand: ARGO-HYTOS' powerful power units only supply energy when it is needed. This saves resources, reduces noise, and lowers the temperature load on the system. This is ideal for mobile or intermittent applications.

Both systems have already been tried and tested in the field many times, can be combined with existing machine layouts, and are documented in accordance with current standards. The consistent modularization of all components allows for individual configuration of these integrated system solutions for hydraulics - from compact filter tanks to intelligent pressure supply systems.

Developing system solutions together now

ARGO-HYTOS stands not only for hydraulic expertise, but also for collaborative project development. OEMs, system integrators, and plant manufacturers benefit from application-specific engineering, pre-assembled modules, tested safety standards, and flexible interfaces. The path to efficient, integrated hydraulic system solutions begins with a conversation. Let's work together to find the perfect solution for your needs! Contact us now.

Whether in mobile machines, stationary systems or complex systems with hydrostatic drives: suction filters are key elements in fluid management. They make a significant contribution to avoiding cavitation, preventing failures and reducing operating costs in the long term. ARGO-HYTOS offers a broad portfolio of suction filters that meet the highest technical and functional requirements.

What do suction filters do to protect a hydraulic pump?

Pumps perform a central function in the hydraulic system. They supply the entire system with energy by drawing in the fluid and pressurizing it. If contaminated oil gets into the suction path, there is a risk of serious consequences - from loss of performance and increased wear to total failure. This is precisely why the use of a high-performance suction filter is essential.

It prevents solids such as metal chips, plastic residue or seal abrasion from entering the pump. These can not only cause mechanical damage but also impair the function of downstream valves and other system components.

The filter also reduces the risk of cavitation. This is because even microscopically small particles or air pockets can lead to the formation of vapor bubbles when the flow rate changes rapidly. If these implode, pressure peaks occur that damage the surface of impellers and seals.

ARGO-HYTOS relies on the principle of full-flow filtration for its suction filters. The entire oil flow that is fed to the pump passes through the filter element. This prevents unfiltered oil from reaching the sensitive components.

The required cleanliness classes can be precisely matched to different system requirements. Among other things, ARGO-HYTOS offers screen filters with a mesh size of 40 to 280 µm for filtering coarser particles as well as filter media made of fleece or paper with a fineness of up to 16 µm(c).

What variants of suction filters does ARGO-HYTOS offer?

Different suction filter types are available depending on the installation situation, tank geometry and line concept. ARGO-HYTOS has developed suitable solutions for all these requirements - from internal tank and tank top mounting to external line installation.

Tank-mounted suction filters

These filters are installed directly at the suction port inside the tank. Their compact design and simple attachment make them particularly space-saving. They are often used in applications with limited installation space - for example in mobile machines.

Suction filter for in-line installation

Here, the filter is integrated into the suction line between the tank and pump. The types are equipped with threaded or hose connections and are particularly easy to replace during maintenance. They are optionally available with plastic or metal housings.

Suction filter for tank top mounting

The great advantage of tank top filters is their ease of maintenance. The filters are generally very easily accessible, so that any necessary service work can be carried out quickly and without loss of oil. At the same time, the risk of leaks is significantly reduced.

Variants with bypass valve or clogging indicator

Equipment options such as integrated bypass valves or combined optical/electrical clogging indicators are used particularly in demanding operations or with sensitive hydraulic systems.

Your advantages with ARGO-HYTOS suction filters at a glance

• Effective pump protection, reliably prevents damage caused by solid contamination
• Maximum oil cleanliness to ensure high cleanliness classes thanks to fine filter elements
• Flexible installation solutions, including internal tank and tank top mounting through to external pipe installation.
• Long service life and easy maintenance
• Clogging indicator for optimum utilization of dirt absorption

How can the maintenance effort for suction filters be minimized?

Suction filters work invisibly during normal operation. However, their condition determines the service life of the pump. We therefore recommend regular inspection and replacement of the suction filters with a sealing point to the environment after no more than 2000 operating hours or two years - whichever comes first.

For suction filters without a sealing point to the environment, cleaning is often sufficient by removing dirt from the outside with a paintbrush or soft scrubbing brush. It is important not to damage the structure of the fabric. After repeated cleaning (usually a maximum of two to three times), a screen filter should also be replaced so as not to impair the filter performance.

Maintenance is even more efficient with an integrated clogging indicator. It measures the pressure upstream of the filter element and gives a visual or electrical warning when the load limit is reached. This means that the change can be planned precisely - without unnecessary downtime, but also without the risk of reacting too late.

What role does the filter fineness play in the overall performance?

Not every system requires the same filtration performance. Depending on the pump, pressure level, tolerances and cleanliness class specifications, the filter element must be selected individually.

• Screen filters made of stainless steel mesh (40 to 280 µm) offer basic protection against coarse particles and for robust systems.
• Paper or non-woven filter elements (up to 16 µm(c)) are suitable for demanding control circuits or high-pressure components.
• Multi-layer media combinations are the first choice for high dirt absorption with low pressure losses.

The right fineness prevents abrasive particles from reaching the pump or proportional valves. It also reduces energy loss due to pressure drop and ensures a consistently stable oil quality during operation. However, filtration that is too fine can lead to high pressure loss. For this reason, each system must be individually adjusted.

How do different industries benefit from the use of ARGO-HYTOS suction filters?

Suction filters from ARGO-HYTOS are not standard off-the-shelf components. They are developed specifically for the requirements of a wide range of industries. Mobile machines such as excavators, tractors or forestry equipment are subject to confined spaces, high mechanical loads and changing operating temperatures. This is where the suction filters score points with their compact design, robust materials and vibration-resistant housings.

Easy accessibility for maintenance and cleaning is a decisive criterion, particularly in agricultural technology, when downtime in the field or in the forest must be avoided at all costs.

In industrial hydraulic systems, such as in machine tools, presses or conveyor systems, the focus is on fine control. High-performance filters are used here, which remove even the smallest particles from the oil circuit with a precise fineness of up to 16 µm(c). The filter systems protect sensitive components such as proportional valves or control blocks and make a significant contribution to process stability.

With hydrostatic drives, the focus is on protecting the filling and charging pumps. Integrated bypass valves prevent cavitation, especially at low temperatures when the viscosity of the hydraulic oil rises sharply. They also ensure the oil supply to the system during cold starts. In offshore or energy applications, there is a further challenge: corrosion caused by salty or aggressive environments.

ARGO-HYTOS meets this challenge with filter housings made of specially alloyed materials. On request, we can also integrate combined clogging indicators that provide both visual and electrical feedback on the filter status.

The wide range of filter media, connection types and accessory solutions means that a precisely coordinated filtration strategy can be created for every application. This intelligently combines operational reliability, ease of maintenance and durability.

Contact us now for maximum filtration reliability

The reliability of a hydraulic system does not start with the control system, but with the cleanliness of the medium. And this is exactly where ARGO-HYTOS suction filters come in. They prevent damage before it occurs and retain particles before they get into sensitive components. They also protect your pump from cavitation, overloading and premature wear.

Whether in agricultural machinery, industrial operations or energy parks: our solutions ensure the function of your system - permanently, efficiently and with minimal maintenance.

But no two hydraulic systems are the same. Different operating conditions, space conditions, viscosities or cleanliness classes require individual solutions. This is why ARGO-HYTOS does not focus on the product, but on your specific application.

Our experts support you in finding the optimum combination of filter fineness, design, installation position and additional functions such as bypass valve or clogging indicator.

Benefit from our decades of experience in fluid technology and from a partner who not only supplies but also contributes its own ideas. We support you from the initial discussion through to implementation - practical, solution-oriented and in close coordination with your technology.

Let us advise you now - on suction filters that not only protect, but also keep your system permanently efficient. Your contacts at ARGO-HYTOS look forward to hearing from you.

The physical basis: How hydraulics transform pressure into movement

Hydraulic drives are based on clear, fundamental physical principles. They use pressurized fluids (usually hydraulic oil) to convert hydraulic energy into mechanical movement. This can be a linear movement in a cylinder or a rotating movement via a hydraulic motor.

The basis are three elementary laws of fluid mechanics:

• Pascal's law
• Bernoulli's equation
• the continuity equation

Pascal's law states that pressure exerted on an enclosed fluid (i.e. a liquid or gas) in a closed system spreads evenly and unchanged in all directions. This means that a change in pressure at one point in the fluid has the same effect immediately and everywhere in the system - regardless of the shape of the container. One example of this is the hydraulic jack: a large load can be moved with little force.

Bernoulli's equation describes the relationship between pressure, velocity and height in a flowing medium. It is based on the principle of conservation of energy: the sum of the static pressure, the dynamic pressure and the hydrostatic pressure along a flow line remains constant. In practice, this means that if a fluid flows faster, the pressure decreases.

The continuity equation describes the principle of mass conservation in a flowing fluid. It states that the volume flow in a closed system remains constant, regardless of changes in the cross-section of the pipe, only the flow velocity changes. This means that the amount of fluid entering a system is equal to the amount leaving the system.

The interaction of these physical principles forms the basis for the function of hydraulic systems.

The main elements of hydraulic drives are the pump, motor and cylinder:

A pump converts mechanical energy into hydraulic energy and pressurizes the fluid. Cylinders and motors convert the energy back into movement in a targeted manner. The resulting work output can be calculated using the following formula:

W = P × Q × η

• W stands for the power of the drive in watts,
• P for the pressure in the system in Pascal,
• Q for the volume flow in cubic meters per second and
• η for the overall efficiency of the drive

This equation can be applied for everyday use:

(l/min × bar) / 600 = kW

Hydraulic drives are characterized by

• high power density
• stepless controllability
• remarkable robustness
• comparatively simple design

What are the advantages of hydraulic drive technology?

One of the key advantages of hydraulic drive technology is its exceptionally high energy density. Compared to electric or pneumatic systems, hydraulic power units enable the implementation of large forces with comparatively small sizes.

Hydraulic drives also impress with their infinitely variable controllability. Both pressure and volume flow can be precisely and dynamically adapted to changing load requirements. This means that hydraulic drives are not only powerful, but can also be controlled sensitively.

The components used - pump, valves, cylinders and motors - are technically mature, modular and designed for harsh environmental conditions. Their robust design makes them resistant to thermal, mechanical and chemical loads.

Added to this is the inherent energy efficiency of the system. Losses can be minimized thanks to the ability to provide power as required and to buffer load peaks in a targeted manner. At the same time, the simple and service-friendly design reduces maintenance costs. This combination of power, control, durability and efficiency gives hydraulic drives their outstanding position in industrial practice.

What are typical areas of application for hydraulic drives?

Wherever high forces are required in a confined space, hydraulic drives are in play. Their versatility, coupled with their power density, makes them the first choice in numerous industries.

Whether on construction sites, in agricultural machinery or in automated production lines: Hydraulic systems show their strength where mechanical solutions reach their limits. In mobile machinery, they control lifting, turning and swivel movements. They make it possible to move loads weighing several tons - precisely and in a controlled manner, even with sensitive operation.

Hydraulic drives are also used across the board in industry - especially where high process forces, precise motion sequences or repeatable positioning are required. In pressing plants, they ensure uniform force transmission, in plastic injection molding systems for millimeter-precise control, in machine tools for fast and precise axis adjustment.

Thanks to their compact design, hydraulic actuators can also be used where space is limited. At the same time, the closed circuit reduces the risk of leaks and minimizes maintenance costs. The combination of power, precision, efficiency and durability makes hydraulic systems a mainstay of modern machine concepts. This applies not only today, but also with a view to future requirements.

Technology with vision: What do modern hydraulic drives have to achieve?

Hydraulic drive technology is constantly evolving. New requirements for efficiency, connectivity and environmental compatibility are constantly driving development forward. Speed-controlled drives are a key topic here. They make it possible to regulate the flow rate according to demand. The system only supplies as much energy as is actually needed. This reduces energy consumption, protects the components and improves the eco-balance of the overall machine.

With increasing digitalization, standardized interfaces are coming to the fore. Modern hydraulic drives can now be easily integrated into complex automation architectures. IoT-enabled sensors, control units and cloud platforms are used to permanently monitor the condition of the system. Predictive maintenance replaces traditional maintenance and prevents unplanned downtime. Industry 4.0 has long since arrived in hydraulics and ensures greater transparency, availability and efficiency.

At the same time, the design of drive units is changing. Electrified and hybrid systems are increasingly being used - especially in mobile machines. Lighter components, compact designs and modular concepts offer new degrees of freedom in design.

Sustainability is increasingly becoming an integral part of development. Efficient use of resources, reduced emissions and long product life cycles are no longer a side effect, but a technological objective. Anyone developing hydraulic drives today must not only guarantee performance, but also take responsibility.

Hydraulic drives from ARGO-HYTOS: Get advice now

ARGO-HYTOS offers you sustainable, economical and convincingly powerful solutions in the field of hydraulic drives. Our teams of experts support you in the selection, design and integration of your systems - regardless of whether you are modernizing existing systems or developing new machines.

Visit our contact page and let our experts advise you without obligation. Together, we can create efficient, robust and innovative hydraulic drive solutions that meet your requirements.

Instead of interconnecting individual valves with extensive cabling and piping, control blocks combine all functions in a compact installation space. This reduces leakage risks, minimizes pressure losses and creates space for individual system solutions.

Especially in mobile machinery, where weight, robustness and ease of maintenance are crucial, the combination of technical precision and structural compactness is indispensable. Find out all about the use of control blocks in hydraulics in this article.

What are control blocks in hydraulics?

A control block is the functional center of many hydraulic systems. As a compact metal body - usually made of aluminum or steel - it combines different valves and their connections in a single component. All channels, holes and interfaces run directly inside the control block.

The results are

• shorter paths for the hydraulic fluid,
• less pressure loss,
• less installation effort and
• significantly higher operational reliability.

Control functions, energy distribution and control processes come together in a control block. The component

• takes over the targeted forwarding of the pressure medium,
• controls the opening and closing of individual circuits and
• enables the precise control of actuators - i.e. cylinders, motors or hydraulic pumps.

In contrast to conventional solutions with external pipe and hose connections, a control block reduces the space required and at the same time eliminates numerous potential leakage points. This makes it the preferred component in mobile machines as well as in high-performance industrial systems. It is therefore relevant wherever the focus is on reliability, functionality and compactness.

What is important when designing control blocks?

The design of a control block determines the performance, efficiency and service life of the entire hydraulic system. Control blocks in hydraulics are solid metal bodies in which all fluid connections are implemented using precise drill holes.

Depending on requirements, control blocks can accommodate one or more valves. The continuous integration of all control functions in one block reduces connection points and therefore potential sources of leakage. Monoblock versions - made from a single piece of metal - are particularly robust and resistant to vibrations, pressure peaks and thermal loads.

Cast control blocks are often used for complex geometries or higher quantities. These enable a flow-optimized design of the internal channels, which further minimizes flow resistance. This reduces pressure losses and increases energy efficiency.

Numerous technical factors need to be taken into account when designing a control block. The choice of suitable material depends on the pressure level, temperature range and media compatibility. At the same time, flow rates, the load capacity of the valves and their exact positioning in the block must be coordinated.

The connection configuration, including ISO-compatible interfaces, is determined in close consultation with the customer. Aspects such as ease of installation, maintenance access and environmental conditions at the installation site are incorporated into the overall design.

How do control blocks work in hydraulics?

A control block directs, regulates and secures the flow of hydraulic fluid within a hydraulic system. The pressure is directed to consumers such as cylinders or hydraulic motors via a system of channels, bores and integrated valves. The target direction of the volume flow as well as the pressure level and flow rate are decisive.

Precisely positioned holes inside the block ensure low-loss routing of the hydraulic fluid. The holes serve as conduits and as receptacles for screw-in valves.

CETOP valves can also be integrated in modular designs, which creates an enormous variety of configuration options. Modular systems are also used in many applications, allowing flexible expansion without having to change the entire hydraulic layout.

A control block has even got more functions: It controls the pressure, enables direction changes, activates individual functions and protects the system in the event of an overload.

The interaction of these factors enables low-maintenance operation, from which modern hydraulic systems benefit significantly.

What are the advantages of control blocks?

Control blocks are a space-saving solution for valve technology with numerous advantages. One of the biggest advantages is their compact design. Especially in mobile machines where installation space is limited, control blocks enable a high functional density in a minimum of space. This reduces weight and space requirements and simplifies routing of the lines and therefore the overall design of the hydraulic system.

Added to this is their enormous versatility. Whether in agriculture, construction or industrial automation: control blocks can be precisely tailored to a wide range of operating conditions in order to meet specific requirements.

Thanks to the combination with modular systems, the system remains flexible and future-proof - even if the hydraulic system is expanded at a later date.

Another plus point is the high operational reliability. The integrated design reduces leakages and increases resistance to mechanical influences. At the same time, users benefit from simplified installation and a maintenance-friendly structure. This saves time and reduces operating costs in the long term. All in all, control blocks are the answer to the increasing demands for dynamics, compactness and reliability in modern hydraulic systems.

What role do control blocks play in energy efficiency?

A well-designed control block makes a direct contribution to the energy efficiency of a hydraulic system. The focus here is on optimized flow routing. Precisely drilled and flow-optimized channels minimize resistance and thus reduce pressure losses. The lower the pressure losses within the system, the more efficiently it works.

Another efficiency factor is that the system temperature can be kept stable by precisely balancing the pressure, volume flow and actuator requirements. Unnecessary heating, for example due to throttle losses or back pressure, is avoided. This protects the components and reduces the amount of cooling required with secondary units.

In addition, the integration of several functions in a single control block reduces the number of components, screw connections and lines required. Fewer individual parts mean fewer pressure drops, shorter lines and less mass to move and control.

ARGO-HYTOS: Your partner for high-quality hydraulic components

ARGO-HYTOS is your experienced partner when it comes to reliable, powerful control blocks that are precisely tailored to your application. With decades of engineering expertise, a deep understanding of hydraulic interrelationships and practical development work, we realize customer-specific solutions that go far beyond standard solutions. Whether hydraulic components for mobile machines or individual custom-made products for industrial systems: our consulting, design and production work seamlessly together.

Our high level of manufacturing expertise allows us to implement complex control blocks with the shortest delivery times and highest precision. You benefit from a well-coordinated team of engineers, application technicians and product specialists who quickly understand your requirements and implement them in a solution-oriented manner. This also applies under demanding conditions.

Control blocks from ARGO-HYTOS can be found in use all over the world: in construction machinery as well as in high-pressure presses and production plants. Our systems are robust, easy to maintain, powerful and precisely tailored to the requirements of our customers.

Are you planning a new project, or would you like to optimize existing systems? Our experts will be happy to advise you. Use our contact form! Together we will develop the solution that will take your hydraulic system to the next level.

In this article, you will learn how electromagnetic actuation systems can effectively contribute to optimizing and increasing the performance of your hydraulic systems. Get to know the most important application possibilities here! Discover how you can operate your hydraulic systems much more efficiently, safely and reliably by choosing suitable systems!

What are electromagnetic actuation systems in hydraulics?

In general, electromagnetic actuation systems convert electrical signals into mechanical movements using an electromagnet. Electromagnetic actuation systems in hydraulics are used to control valves by precisely regulating or interrupting the fluid flow.

Unlike manual or purely mechanical actuators, these systems are automated and respond directly to electrical control signals. Manual solutions require manual operation. And mechanical systems are often controlled by hydraulic pressure or mechanical connections.

The decisive advantage of electromagnetic actuation systems lies in their extremely high precision, short response time and efficiency. Thanks to precise electrical actuation, electromagnetic actuation systems open and close valves in a matter of seconds, enabling particularly fast and precise processes. At the same time, they are energy-efficient as they only consume electricity when they are actually actuated. This reduces operating costs and significantly increases the overall performance and reliability of hydraulic systems.

What types of electromagnetic actuation systems are there in hydraulics?

In hydraulic technology, electromagnetic actuation systems can basically be divided into two categories:

• Systems for switching valves
• Systems for proportional valves

Both types essentially consist of:

• a pole tube (1)
• a movable armature (2)
• an electric coil (3)
• a fastening nut (4)

Nevertheless, they differ in their functionality and application.

The pole tube consists of two ferromagnetic parts that are connected by a non-magnetic ring. This has a significant influence on the lifting force characteristic of the system. ARGO-HYTOS relies on high-quality, soldered connections here.

The movable armature has an integrated longitudinal hole for volume compensation, which ensures optimum operation. For applications that require particularly smooth switching, the opening can also be fitted with a special shutter (soft-shift option).

The coil generates the magnetic field and determines the strength of the generated field through its winding of copper wire. Depending on the number of windings and current strength, the field is stronger or weaker, which influences the movement of the armature.

A nut is used to secure the valve, which can also be equipped with manual emergency actuation as an option. This ensures reliable operation in the event of a power failure.

The main differences between switching and proportional valves

Switching valves:

• Binary control (valve position only on/off)
• Fast response time
• Simple control (DC or AC)

Proportional valves:

• Stepless control (variable valve positions)
• Sensitive, precise control
• More complex electronics required
• Softshift option for reduced pressure peaks

How does an electromagnetic actuation system work?

The operating principle of electromagnetic actuation systems is based on electromagnetism. As soon as current flows through the coil, it generates a magnetic field. This is bundled by the pole tube and acts on the ferromagnetic armature.

The armature is attracted by the magnetic field and moves in the direction of the pole tube. This movement is transferred to the control piston in the valve, which then releases or blocks the flow of hydraulic oil.

The mode of operation varies between switching and proportional valves. Switching valves work with binary control and therefore only have two states: open or closed.

In contrast, proportional valves allow infinitely variable control of the valve positions. Integrated ramp functions allow pressure peaks to be avoided and the load to be reduced.

How do you choose the right electromagnetic actuation system for hydraulic applications?

To find the right electromagnetic actuation system for your hydraulic application, you should first consider three key factors:

• required pressure range
• required volume flow
• type of control

The pressure range and volume flow rate are decisive in determining which valve and therefore which electromagnetic actuation is technically suitable.

You should also pay attention to the following selection criteria:

• The reaction speed determines how quickly your system responds to commands.
• The lifting force influences the performance - especially with higher pressure requirements.
• The electronic control system also plays an important role. Make sure that the electronics used are optimally compatible with your control infrastructure.

The ARGO-HYTOS team of experts will be happy to assist you in selecting a system that exactly meets your requirements.

Precise control, maximum performance: optimize your hydraulics now!

Electromagnetic actuation systems enable maximum precision, efficient sequences and reliable processes in your hydraulic applications. By choosing the right electromagnetic system from ARGO-HYTOS, you benefit from short response times, improved energy efficiency and minimized maintenance requirements. This increases the productivity and reliability of your machines in the long term.

Would you like to find out more about which system is best suited to your individual requirements? Our experts will be happy to advise you personally. Get in touch with us today. Together we can optimize your hydraulic processes with tailor-made electromagnetic solutions from ARGO-HYTOS!

Pressure valves regulate and limit the pressure in a hydraulic system. The specific task depends on the requirements of the respective area of application. The choice of valves is decisive for the stability and durability of a system.

ARGO-HYTOS develops and manufactures a wide range of pressure valves - direct or pilot operated, in poppet or spool design, modular or as a screw-in valve. The range is supplemented by variants with PED certification for applications with pressure reservoirs or pressure accumulators.

In the following, you will find out about the various pressure valves available, how they work and what is important when using them in practice.

What types of pressure valves are there?

Pressure valves can functionally be divided into these three categories:

• Pressure relief valves
• Pressure reducing valves
• Pressure control valves

Each of these types fulfills a specific task in the pressure control of hydraulic systems and must be selected according to the operational requirements.

Pressure relief valves protect hydraulic systems from dangerous overpressure. They react directly to the inlet pressure and open as soon as this exceeds the set target value. The excess hydraulic fluid is drained into the tank via the valve, which immediately reduces the pressure in the system.

In the case of directly controlled versions, the valve is triggered directly via the pressure force on a spring-loaded valve element. Pilot operated versions work with a pilot stage that controls the main stage. This is ideal for higher flow rates or sensitive systems. Due to their design, pressure relief valves deliberately generate a significant pressure drop and are therefore not suitable for pressure control.

Pressure reducing valves reduce a high inlet pressure to a defined, constant level at the outlet. This is particularly necessary if individual consumers in the system require a lower operating pressure than others.

In the case of pressure reducing valves with secondary protection, the inlet is throttled if the pressure in the outlet is exceeded and the return to the tank is opened at the same time. This ensures stable pressure ratio control - regardless of pressure fluctuations in the supply.

Pressure control valves ensure continuous regulation of the pressure within a system or sub-circuit. They react to changing loads and volume flows in order to keep a defined operating pressure constant even under dynamic conditions. This not only stabilizes the process, but also reduces energy consumption, wear and noise levels in the system.

Pressure valve technology from ARGO-HYTOS

The demands placed on modern hydraulic systems are as varied as the applications themselves. Whether in mobile hydraulics, in industrial systems or in safety-critical systems with pressure accumulators: Every application requires precisely coordinated pressure control.

ARGO-HYTOS offers a comprehensive portfolio of pressure valves covering a wide range of designs, control principles and approvals. The combination of many years of development experience and practice-oriented system expertise enables individual solutions with maximum reliability, power density and energy efficiency.

Poppet and spool type design

Pressure valves in poppet design are characterized by excellent tightness and a short response time. The conical valve body closes positively and non-positively on the poppet. This ensures reliable sealing without leakage oil even at high pressure. Pressure valves in poppet design are particularly suitable for safety-critical applications or systems with frequent load changes.

Spool valves offer a softer opening characteristic and are more resistant to contamination. Their uniform control characteristics make them ideal for applications with variable volume flows and stable pressure control with a high flow rate.

Installation and modular designs

Built-in valves - designed as screw-in cartridges - offer a compact solution for confined installation spaces and integrated control blocks. They can be installed directly in customer-specific housings, which saves weight, space and costs.

Modular valves, on the other hand, are mounted on standardized sub-bases (e.g. CETOP) and allow easy expansion or modification of existing systems. They offer maximum flexibility, particularly in mechanical and plant engineering, for example for integrating additional safety functions such as secondary or shock valves.

Direct-acting and pilot-operated versions

Direct operated pressure valves react immediately to changes in pressure. They have a simpler design and offer a fast, direct response. This makes them ideal for applications with low to medium flow rates.

Pilot operated valves are used for higher flow rates or when particularly sensitive pressure control is required. They use a pilot stage to control the main spool. This enables flatter pressure curves and precise pressure control even with fluctuating load behavior.

Proportional pressure valves

Proportional pressure valves enable infinitely variable pressure control via an electrical control signal. This is ideal for applications with changing load situations or automated pressure adjustment. ARGO-HYTOS offers proportionally actuated pressure relief, pressure control and pressure reducing valves in CETOP, modular and screw-in versions. Variants with integrated electronics or spool position sensor are optionally available.

Valves with certification in accordance with the Pressure Equipment Directive 2014/68/EU (PED)

Special safety requirements apply to systems with pressure reservoirs or accumulators. For this area, ARGO-HYTOS offers special pressure valves with PED certification in accordance with Directive 2014/68/EU. These valves, such as the SR1A-B2 or the VPP-R-16, guarantee a defined opening characteristic and prevent impermissible pressure peaks.

The certified variants are available with a fixed or adjustable pressure characteristic and are equipped with a secured adjustment screw for tamper-proof configuration. This makes them an indispensable component in safety-critical hydraulic circuits.

How do pressure valves work?

Pressure valves intervene specifically in the hydraulic circuit to control, limit or keep the pressure constant.

Pressure relief valves work as safety components. They open as soon as the pressure in the system exceeds a preset limit value. The excess hydraulic fluid is drained directly to the tank, reducing the pressure. They are opened either by the pressure force on a valve element or via a pre-controlled pilot stage. The valve automatically returns to the closed position as soon as the pressure falls below the limit value again.

Pressure reducing valves regulate the pressure of downstream components. The inlet pressure is reduced to a lower, constant outlet pressure by a control valve. If the outlet pressure rises, the valve closes partially or completely and opens the relief channel to the tank if required. The special feature is the 3-way function, which both regulates the inlet and discharges excess pressure.

Pressure control valves keep the system pressure at a constant level - regardless of load or volume flow fluctuations. They react continuously to changes and adjust the flow rate so that the set operating pressure is permanently maintained. This ensures stable processes, reduces wear and optimizes energy efficiency.

Why are pressure valves indispensable in many areas?

Pressure relief valves safeguard the operation of hydraulic systems and thus protect machines and people from damage. Pressure relief valves perform a protective function. They prevent overpressure in line systems and cylinders, for example in the event of blocked loads or load peaks in mobile machinery, and protect the components from overload and damage.

They also protect the structure of the system in presses and hoists and prevent process interruptions.

Pressure reducing valves enable the supply of different consumers in a complex hydraulic circuit with an adapted pressure level in each case. In agricultural machinery, for example, steering, lifting gear and auxiliary control units require different pressure ranges. The valve regulates the higher system pressure down to a precise, low level and protects sensitive components such as control valves or sensors from overload.

In machine tools, the pressure reducing valve ensures that clamping systems or coolant circuits are not damaged by excessive pressure.

Pressure control valves stabilize the pressure in dynamic systems - regardless of whether the inlet pressure or the volume flow changes. In municipal commercial vehicles, the valve ensures constant pressure at consumers with changing loads. In industry, it keeps the pressure in production plants at the desired level and ensures consistent quality and process reliability.

Would you like to find out more about ARGO-HYTOS solutions in the field of pressure valves? Then get in touch with our team of experts.

I would currently see the tense global economic situation and the simultaneous pressure to innovate towards new solutions for climate neutrality as the biggest challenge. On the one hand, our customers and we have to face the growing competition and the associated cost pressure. On the other hand, machine manufacturers and we are being called upon to make mobile machinery ever more efficient, productive and sustainable.
The necessary adaptation of individual drive components alone will not be enough. Rather, it is necessary to take a holistic view of drive concepts. In this step, fluid technology faces the challenge of reacting to changing market requirements and contributing its own innovations.
The strength of ARGO-HYTOS lies in our knowledge of the construction machine application and in designing our products precisely to meet the needs of its drive concepts and systems.
In addition, the cooperation as a member of the VOITH Group offers the opportunity to overcome the existing limits of our product portfolios together and to break new ground.

What could new drive concepts in the hydraulics sector look like for the construction industry?

We are seeing a multiplication of possible drive concepts. While the diesel-powered combustion engine has usually been the primary energy source up to now, we are seeing a trend towards (battery-powered) electrification, particularly in machines in lower performance classes. This means that the drive systems behind them, such as the working hydraulics, must also adapt to the changing boundary conditions in order to maximize the cost/benefit ratio of the overall vehicle.
In addition to battery-electric solutions, combustion engines are currently often indispensable in mobile machinery, as the required energy and power densities, availability and costs can only be achieved with these.
Nonetheless, the changing requirements here also require a new look at the underlying system architectures and components. This applies regardless of whether diesel, sustainable e-fuels or hydrogen are used as energy source.

Ultimately, it is the user who decides which drive concept will primarily prevail for which construction machine in the future. It is not only acquisition and operating costs, machine performance, availability and robustness that play a key role. Ultimately, there must always be a general technical acceptance of an alternative drive concept - comparable to the increasing acceptance of battery-electric cars on the road.

How do ARGO-HYTOS solutions contribute to sustainability?

We think “sustainability” on various levels in order to operate successfully in an ecological, fair and long-term manner.
On the one hand, this is reflected in the customized design of our hydraulic drive systems and components for our customers. This means performance adapted to the work task and consequently lower energy consumption and reduced greenhouse gas emissions.
On the other hand, the product design itself already holds potential in terms of sustainability.
For example, the choice and weight of materials for components designed for machine service life play just as important a role as the efficient use of materials for filter elements that need to be changed regularly.
Last but not least, we are constantly developing our processing methods and production technologies with the aim of making them as energy-efficient and resource-saving as possible.

ARGO-HYTOS is not exactly associated with alternative or electric drives, what can you tell us about this?

As part of the VOITH Group, we want to live up to our reputation as an innovative technology company in the field of drive technology. Driving forward the energy and mobility transition is a central aspect of VOITH TURBO's mission, which also includes ARGO-HYTOS.

This does not only include the conversion of the energy source and the first energy conversion, the so-called “prime mover”, in our customers' machines. In order to exploit the maximum potential, it is necessary to consider the entire drive concept from the energy source to the final work task such as a movement or force. In the field of mobile machinery, working hydraulics will continue to play an important role in the future and open up new opportunities.
Traditionally, ARGO-HYTOS not only develops and produces pure hydraulic components such as valves and filters, but also designs the appropriate hydraulic system architectures between the drive motor and the final output together with the machine manufacturer. Our system experts in particular have always thought in terms of “alternative” drives - whether electric or powered by a combustion engine.

We are therefore responding to the increasing diversity of new drive concepts and their special features with comprehensive expertise and innovation competence. By working together with VOITH, we can continue to utilize these strengths and drive innovation forward in order to meet the changing and growing needs of the market.

What do you personally expect from bauma 2025? What impetus could the trade fair provide for the construction industry?

Our trade fair appearances require a high level of commitment, permanent presence and the best possible communication. During a bauma week, this can only succeed if your own motivation and the “joy of doing” remain constantly high.
I am looking forward to an intensive exchange with our customers, new contacts, industry experts and old acquaintances.
I hope that the “live trade fair” platform will help the entire construction industry to find ways out of the current difficult situation and spread much-needed optimism. The opportunity is there.

While classic directional control valves only change between open and closed switching positions, proportional directional control valves allow continuous regulation. This is achieved by an electrically controlled proportional solenoid, which moves the valve spool in proportion to the signal strength. This allows the speed and force of hydraulic drives to be precisely controlled.

In this article, we take a detailed look at the design, functionality and diverse applications of proportional directional control valves. Find out in which areas the valves show their strengths and what technical advantages proportional valves from ARGO-HYTOS offer.

The core components of proportional directional control valves

The housing forms the basic structure of proportional directional control valves. It accommodates all internal components and protects them from mechanical influences, contamination and pressure fluctuations. High-strength materials ensure a long service life and reliable function under extreme conditions.

At the center of the valve is the valve piston - an axially movable element that opens or closes the flow paths of the hydraulic oil. Its position determines how much fluid flows through the valve and in which direction it is directed.

The return spring ensures a safe return. It returns the piston to its starting position as soon as there is no longer an electrical control signal. As a result, the valve remains closed or open in the idle state, depending on the design.

The actual control is performed by the proportional solenoid. It generates a force that moves the spool in proportion to the applied voltage or current. The stronger the electrical signal, the further the spool moves and regulates the flow rate accordingly.

High-quality seals are integrated to ensure that the valve remains permanently tight. They prevent leaks and ensure that the hydraulic fluid is controlled in a targeted manner and without unnecessary losses.

The inlet and outlet connections enable optimum integration into the hydraulic system. Various connection configurations are available depending on the design and application.

Sensors are also used in many modern variants. They monitor the piston position or the actual flow rate and provide valuable feedback to the control unit. This data enables high-precision, closed-loop control and helps to increase the efficiency of the entire hydraulic system.

How does a proportional directional control valve work?

The control of a proportional directional control valve is a combination of electrical control, mechanical movement and precise regulation of the volume flow. In contrast to conventional switching valves, which only switch between “open” and “closed”, a proportional valve operates continuously. This allows hydraulic movements to be initiated smoothly, finely dosed and precisely controlled. This is a decisive advantage for machines that work with variable loads.

It all starts with the proportional solenoid that controls the valve. As soon as an electrical voltage or a defined current is applied, the solenoid generates a force that sets the valve piston in motion. The stronger the signal, the further the piston moves and the larger the flow cross-section for the hydraulic oil.

This precise control allows movements to be ramped up smoothly or set precisely to a certain speed.

The valve would not work without the return spring. It ensures that the piston returns to its initial position after the signal is switched off. Without it, the valve would remain uncontrolled in any position. Additional sensors, which can be optionally installed in modern valves, monitor the exact position of the piston or the current flow rate. This information is fed back to a control unit, resulting in highly dynamic, closed-loop control. The valve thus adapts to changing conditions in real time. This is an indispensable feature in modern hydraulic systems where milliseconds count.

Thanks to this ingenious mode of operation, proportional directional control valves are ideal for applications that require maximum precision and efficiency. These include, for example

• Machine tools
• Presses
• Mobile machines

Directional control valves ensure smooth, harmonious motion sequences while protecting the system from unnecessary energy loss and wear.

Where are proportional directional control valves used?

Proportional directional control valves come into their own wherever pressure and volume flow need to be precisely controlled. Thanks to various designs, intelligent control technology and optional sensor technology, they can be optimally adapted to the requirements.

One important area of application is industrial automation. In machine tools, proportional directional control valves control movements such as the clamping of workpieces or the positioning of axes with maximum precision.

Presses benefit from precise control of the pressing pressure and speed. In injection molding machines, the injection pressure and the speed of the plastic flow are precisely controlled. The valves also ensure smooth movements in assembly systems - for example when positioning robots or conveyor belts.

But the valves are not only indispensable in stationary systems. Directional control valves are also used in mobile machinery. In construction machinery, for example, they control the precise movement of excavator arms, cranes or loading shovels.

Road pavers use them for the precise control of screeds and augers to ensure even asphalt distribution. They are also used in agricultural machinery - for example when lifting and lowering attachments on tractors or harvesters. In forestry, the valves are used to precisely control cutting and gripping tools.

ARGO-HYTOS offers proportional directional control valves in a wide variety of designs - from versions with analog control electronics to valves with integrated position sensors. Depending on the application, they can be controlled directly or pilot-controlled and optionally equipped with CAN bus interfaces or internal feedback.

What makes proportional directional control valves so extremely versatile?

• They enable infinitely variable control of pressure and volume flow for precise movements.
• Their design is flexible - whether as a surface-mounted valve or screw-in valve in spool or poppet design.
• They are available in directly controlled or pilot-controlled versions and can therefore be adapted to different system requirements.
• By integrating position sensors, they can provide precise feedback on the piston position.
• With a CAN bus interface, they can be integrated into modern machine control systems.
• Their fast response time ensures immediate adaptation to control commands.
• They are suitable for a wide range of applications in industry and mobile machinery.
• Their compact design allows easy integration into existing hydraulic systems.
• Thanks to internal feedback, they are optimized for closed control loops and enable dynamic control.
• They contribute to energy efficiency by precisely controlling movements and minimizing power losses.

Optimizing your hydraulic systems together

Proportional directional control valves from ARGO-HYTOS enable precise and efficient control of hydraulic systems. Thanks to their versatility, they can be integrated into a wide variety of applications. They offer an optimum combination of performance, energy efficiency and durability. Whether in industrial systems or mobile machinery, they ensure smooth, precise movements while protecting the hydraulic components from unnecessary wear.

Thanks to continuous further development and state-of-the-art technologies, we at ARGO-HYTOS ensure that your hydraulic systems become more efficient, reliable and adaptable. The integration of sensors, CAN bus interfaces and internal feedback enables intelligent control in real time that adapts to changing operating conditions.

Would you like to optimize your hydraulic systems with innovative and powerful valves? Our experts will be happy to advise you to find the best solution for your individual requirements. Contact us and benefit from our know-how in the development of modern hydraulic technologies. We look forward to working with you to raise the efficiency and precision of your systems to a new level.

Modern filtration systems go far beyond cleaning the hydraulic oil used. They ensure continuous monitoring of the oil quality and create the basis for proactive maintenance strategies. Companies that consistently use such solutions can reduce machine downtimes and sustainably lower their operating costs. As process reliability and resource conservation are more important than ever, optimized fluid maintenance is becoming an indispensable part of any industrial production process.

Find out in this article how ARGO-HYTOS can support your company with state-of-the-art fluid management solutions, because we offer products that optimize the performance of your hydraulic systems.

How does Fluid Management ensure the reliability of hydraulic systems?

Sophisticated fluid management is one of the key components for ensuring long-term machine quality and reliability. Contaminated hydraulic oil or lubricant not only leads to wear-related failures. It also impairs the functionality of systems and significantly reduces energy efficiency.

Around 80% of all failures in hydraulic systems can be directly traced back to contaminated operating fluids. Effective fluid management starts at this point to prevent such problems.

One example of modern solutions are oil service units such as the products in the UMPC2 series from ARGO-HYTOS. These systems are specially designed to efficiently remove contaminants and document the cleanliness class of the oil.

In addition to pure filtration, they also support the user during initial filling or when refilling hydraulic fluids. With automatic functions such as oil dosing and a shut-off function when the target quantity is reached, these devices ensure precise results with minimal effort.

Such systems play a key role in the production process in particular (for example during final assembly). By using high-performance off-line filters, the cleanliness class of the hydraulic oil can be significantly improved right from the initial filling.

This not only ensures the quality of the machine, but also offers additional protection during the warranty period. The documented cleanliness has a positive effect on end user confidence.

Another argument for the use of modern filtration systems is the high potential for savings. Clean operating fluids reduce wear on components such as pumps and valves, thus lowering the costs for spare parts and repairs. In addition, optimized oil conditions can increase the energy efficiency of systems, which offers a further competitive advantage in the face of rising energy costs.

Ensuring machine quality through fluid management is not an isolated process, but an integral part of modern maintenance strategies. With the right systems, it is not only possible to minimize sources of failure. It can also improve the overall performance of the system.

Why is Fluid Management suitable for both initial filling and retrofitting?

The optimization of hydraulic systems begins with the initial filling. Sophisticated fluid management ensures that machines are put into operation with optimally cleaned operating fluids. This step is essential to extend the service life of components such as valves, cylinders and pumps. Even the smallest contamination can cause considerable damage in high-precision systems, and reliably clean operating fluids are therefore essential during commissioning.

In addition to the initial filling, retrofitting also plays a decisive role. Older systems in particular benefit from modern filtration systems that can be integrated into existing systems as bypass solutions.

These systems - such as the tried-and-tested FNAPC series from ARGO-HYTOS - not only offer excellent filtration. They also enable continuous monitoring of oil parameters such as cleanliness, humidity and temperature. Such functions enable predictive maintenance, which avoids unplanned downtime and increases operating efficiency.

The advantages of Fluid Management in daily use

For operators, there are numerous advantages to implementing fluid management. The service life of the machines can be extended many times over, productivity increases and operating costs fall. The simple integration of modern filter units is particularly noteworthy. They can be integrated into existing systems without costly conversions. Thanks to automated functions such as automatic switch-off and simple operation, they are also particularly user-friendly.

The aim should always be comprehensive fluid management that can be used for both new and existing machine solutions. As a system operator, you will immediately benefit from greater reliability, reduced maintenance costs and a significantly longer service life for your systems.

What makes Fluid Management so valuable?

• Sophisticated fluid management during initial filling ensures that machines are put into operation with cleaned operating fluids, preventing damage caused by contamination.
• Modern filtration systems can be integrated into existing systems and continuously improve oil parameters such as cleanliness, humidity and temperature.
• Optimized fluid management systems extend the service life of machine components and reduce wear at the same time.
• Filtration systems are easy to integrate, do not require complex conversions and offer automated functions such as automatic shut-off.
• Operators benefit from greater reliability, reduced operating costs and more efficient machine performance.

Multifunctional design, compact construction

Modern filtration systems combine several functions in a single device and thus represent a versatile added value for your company. The units developed by ARGO-HYTOS combine cleaning, monitoring and protection of hydraulic and lubricating oils in a compact design. This not only enables space-saving installation, but also flexible use in different areas of application.

A key feature of such multifunctional systems is their compatibility with a wide range of fluid types and viscosity ranges. This means that they can be used in existing systems as well as when planning new machines. Automated functions such as automatic shutdown and intelligent energy-saving modes also simplify operation and conserve resources.

The ability of modern filtration systems from ARGO-HYTOS to monitor oil parameters such as cleanliness, humidity and temperature in real time is particularly noteworthy. This creates the basis for proactive maintenance and reduces unplanned downtimes to a minimum. The fast data transmission and documentation of operating conditions also ensures complete traceability, which is essential in many industrial sectors.

With their multifunctional design, our solutions are an excellent choice for companies that want to ensure efficient and reliable fluid maintenance. The systems not only help to extend the service life of machines. They also help to optimize operating costs by minimizing maintenance and increasing efficiency.

Contact us now and get advice from ARGO-HYTOS

Sophisticated fluid management is essential for the reliable and long-term high-performance operation of hydraulic systems. Modern filtration solutions from ARGO-HYTOS offer a wide range of applications - whether for initial filling, retrofitting or continuous monitoring of oil parameters. The benefits are obvious and include a longer machine service life, reduced maintenance costs and optimized operating efficiency.

Would you like to find out more about ARGO-HYTOS solutions or discuss individual requirements? Then contact us to find the right solution for your application. Our team of experts will be happy to provide you with optimum support for your processes.

ARGO-HYTOS suction filters can be used for a wide range of applications. Our solutions in the field of suction filtration are suitable for both open and closed circuits. They are used in the suction line of pumps in hydraulic or lubrication systems. They also ensure the protection of filling pumps in hydrostatic drives.

Learn all about suction filters in this article and discover the benefits of suction filtration for maximum system performance!

How does suction filtration work and what makes suction filters efficient?

Suction filtration performs several crucial tasks in a hydraulic system. The main function of suction filters is to protect pumps and components from harmful particles. These can enter the system through abrasion or external influences such as repairs or oil refills.

Full-flow filtration in the suction line ensures that all impurities are reliably filtered out. The results are greater system cleanliness and reliable pump operation.

In order to maximize wear protection, high-quality filter elements are used for suction filtration. They fulfil their task reliably, even with demanding cleanliness requirements.

Coarse screen elements retain larger particles up to 280 µm. Finer working filters made of cellulose or glass fiber fleece down to a fineness of 16 µm(c). This keeps the hydraulic circuit clean and significantly extends the service life of pumps and system components.

Filter maintenance is a key issue for suction filtration. Regular replacement prevents a dirty filter element from obstructing the oil flow or impairing system performance. For suction filters with a sealing point to the environment, we recommend replacing the filters every 2,000 operating hours or after two years at the latest. This depends on the operating conditions. The finer the filter, the more important this becomes.

A clogging indicator offers clear advantages. It signals the optimum time to change the filter, which avoids unnecessary downtimes and maximizes the service life of the filter.

Screen filters can also be cleaned. The elements can be cleaned and reused using ultrasonic baths, special cleaning agents or mechanical brushing. However, cleaning should not be carried out more than 2–3 times. It is then advisable to replace the filter that has been cleaned several times by a new filter.

Which options improve the efficiency of suction filtration?

Suction filtration can be adapted to individual system requirements using specific options. Clogging indicators ensure that the optimum time for a filter change is not missed. They continuously measure the pressure loss at the filter element and signal when it exceeds a set value.

Optical indicators allow the degree of contamination to be determined on site. Electrical clogging indicators also transmit a signal to the control system. Combined indicators offer the advantages of both variants. They enable predictive maintenance, which minimizes downtimes and optimizes the service life of the system.

A bypass valvea ensures additional operational safety during suction filtration. In the event of a heavily contaminated filter element or increased viscosity (e.g. during cold starts), the valve opens automatically to allow the oil to flow. This is also the case when the filtration reaches its limits.

This reliably protects the pump from cavitation, while the oil flow is guaranteed at all times. A bypass valve provides reliable protection for the entire system, especially under demanding operating conditions.

Extension pipes offer flexible options for adjusting the installation depth of the suction filter. Extensions of up to 500 mm allow the filter to be optimally positioned in the tank. This not only makes installation easier, but also ensures smooth operation in systems with oil tanks of different sizes.

Magnetic system: In suction filters with a magnetic system, the ferromagnetic particles first flow through the influence of a strong magnetic field and are separated there. This protects the filter element and increases the service life.

These options make the use of suction filters more efficient, reliable and adaptable. They ensure that the system remains optimally protected and efficient even under changing conditions.

How does the design influence the performance of suction filters?

The design of a suction filter has a significant influence on its efficiency and performance in the hydraulic system. The correct design of the filter can minimize pressure losses, optimize filtration performance and significantly extend the service life of the pump. The flow principle, choice of material and design are decisive for efficiency.

A key factor is the star pleating of the filter material. Suction filters often have star-pleated filter elements, as this results in a very large filter surface, very low pressure losses and an exceptionally long maintenance interval.

The choice of material also influences the function. Filter housings made of reinforced plastic offer high resistance to shocks and vibrations with a low dead weight. Stainless steel mesh screens ensure a long service life and consistent filtration quality even under high loads.

Advantages of an optimized suction filter design

• An even oil flow reduces pressure losses.
• Robust materials ensure durability.
• A magnet system maximizes filter utilization.
• A compact design saves installation space.
• Durable screen mesh ensures stable filter performance.

It all depends on the right filter fineness

The choice of the right filter fineness has a direct influence on the performance and reliability of a hydraulic system. Each system has different requirements in terms of oil cleanliness. This depends on the type of components, the operating conditions and the desired service life. While coarse filter elements retain coarser impurities, finer elements ensure that even the smallest particles are reliably removed from the oil.

Screen filter elements with a mesh size of 40 to 280 µm are particularly suitable for pump protection. In this area, they fulfill the function of basic protection by retaining coarse particles such as metal abrasion or larger dirt inclusions.

This filter stage is particularly important in systems that are operated under harsh conditions or are filled with oil after repairs. It prevents coarser impurities from entering the pump and causing damage or cavitation.

For more demanding applications, filter elements made of paper or fleece are used, which achieve a fineness of up to 16 µm(c). They reliably filter out even the finest particles and thus guarantee the highest cleanliness classes. Especially in precise control systems or modern high-pressure pumps, this filtration stage prevents premature wear and increases the efficiency of the entire system.

Incorrect filter fineness adjustment, on the other hand, can lead to problems. A filter that is too coarse allows dirt particles to pass through, damaging the components in the long term. If the filtration is too fine, the pressure loss in the system increases. This impedes the oil flow and increases the risk of cavitation.

Contact the experts at ARGO-HYTOS now

A reliable, durable and efficient hydraulic system starts with the selection of the right components. Choosing the right type of filter, the optimum filter fineness and the integration of additional options such as clogging indicators or bypass valves requires technical expertise. A deep understanding of your individual requirements is also necessary. This is where the experts at ARGO-HYTOS come into play.

Thanks to decades of experience in hydraulic technology, we can offer you tailor-made solutions that are a perfect fit for your hydraulic system. Our specialists analyze the conditions of your systems and help you to use suction filters optimally. In doing so, they not only take into account the requirements for filtration performance and pressure loss, but also the cost-effectiveness and long-term reliability of your systems.

Whether you are optimizing an existing system or planning a new project, individual advice pays off. From the selection of the right filter elements to the integration of additional options such as contamination indicators or extension pipes, ARGO-HYTOS is at your side. We offer you precise, efficient and tried-and-tested solutions.

Contact our experts now for a no-obligation consultation. Together, we will ensure that your systems work cleanly, efficiently and trouble-free. Put your trust in our expertise! Rely on filtration solutions that provide optimum protection for your hydraulic systems and extend the service life of your components in the long term!

Particle counters accurately measure the size and number of particles in the oil. This ensures that you can react to contamination at an early stage - long before damage can occur. The devices can be used flexibly - both in stationary systems and in mobile applications.

Thanks to particularly precise measured values, maintenance work can be planned in a targeted manner. This saves costs and also extends the service life of the components in your hydraulic systems.

This article provides you with a compact overview of the functionality and benefits of the ARGO-HYTOS particle counters. Find out everything you need to know about how our particle counters can be used to sustainably improve the performance and reliability of hydraulic systems and drives.

Why is oil cleanliness important in hydraulic systems?

In hydraulic systems, the cleanliness of the oil is crucial for reliable and efficient operation. Even the smallest impurities can have a significant impact, as they increase wear on pumps, valves and cylinders.

This wear not only leads to malfunctions, but in many cases also to premature component failure. Contaminated oil also causes flow losses and impairs the performance of the entire system.

Effects of contaminated oil

• Increased wear: Abrasive particles attack seals, bearings and surfaces.
• Malfunctions: Dirt particles block valves and restrict the mobility of actuators.
• Energy loss: Contamination caused by particles increases the flow resistance and leads to higher energy consumption.
• High repair costs: Premature damage to central components causes expensive downtimes and repairs.

High oil cleanliness significantly reduces these risks. Clean oil extends the service life of components and minimizes both the maintenance required and the costs. Clean oil also enables more stable performance - especially in applications with high pressures and accurate control requirements.

Industry standards such as ISO 4406 are used to ensure the required cleanliness. They classify the particle size and number that can be tolerated in the oil. Regular monitoring against these standards is essential to ensure the efficiency and longevity of hydraulic systems.

By using modern particle counters, filter technology and optimized fluid management, contamination can be precisely detected and controlled. This prevents breakdowns and ensures smooth operation. This is a decisive advantage for companies that depend on the reliable performance of their machines.

How does the OPCount particle counter from ARGO-HYTOS work?

The OPCount from ARGO-HYTOS uses the light extinction method to precisely measure particles in the hydraulic fluid. A beam of light is passed through the fluid. Particles that pass through the light beam cast a shadow on a photodiode. The intensity and duration of the light attenuation is analyzed to determine the size and number of particles.

This method is characterized by its high accuracy and reliability. The technology enables the detection of particle sizes in the range from ≥4 µm to 68 µm.

The OPCount measures the cleanliness classes of the hydraulic oil according to international standards such as ISO 4406, NAS 1638 and SAE AS 4059. These classifications provide a basis for assessing the degree of contamination and monitoring the oil quality. Both online and offline measurements are possible, allowing the OPCount to be flexibly adapted to different applications.

Online measurements enable continuous monitoring of the system directly in the pressure line. Offline measurements, for their part, allow detailed analysis from bottle samples or reservoirs.

Thanks to its versatility, the OPCount can be used in a wide variety of scenarios, such as the following:

• Checking hydraulic fluids before filling a system
• Monitoring during operation
• Quality inspection after filtration

The OPCount can also be used safely in high-pressure environments as it is designed for line pressures of up to 420 bar. The combination of precision, flexibility and robustness makes the OPCount a valuable measuring instrument for ensuring oil cleanliness. It also contributes to the long-term smooth operation of hydraulic systems.

What makes the OPCount particle counter so universal?

The OPCount was developed to enable reliable and precise monitoring of oil cleanliness in a wide range of applications. In hydraulic systems, it ensures continuous monitoring of the fluid condition by measuring particle sizes from ≥4 µm to 68 µm.

This makes the particle counter ideal for the reliable monitoring of hydraulic oils. These are subjected to heavy loads in pumps, valves and cylinders in continuous operation.

In construction and agricultural machinery, the OPCount enables the oil condition to be checked on site. Its robust design and the ability to take samples from pressure lines or reservoirs ensure reliable measurement results even under demanding conditions. In workshops, it can be used for preventive maintenance in order to react to potential contamination in good time.

In industrial processes, for example in pharmaceutical production or aviation, the OPCount ensures accurate monitoring of the hydraulic systems used. In these safety-critical areas, the particle counter minimizes the risk of component failure through real-time measurements and contributes to compliance with strict quality specifications. Thanks to its online and offline functionality, it can be integrated into pressure lines as well as used for manual analyses.

The technical flexibility of the OPCount allows seamless integration into existing systems. Among other things, this is achieved through connectivity via USB or external sensors. With maximum operating pressures of up to 420 bar, it is suitable for both mobile and stationary applications. This makes the particle counter a central component in your process monitoring and maintenance planning.

The advantages of the particle counter from ARGO-HYTOS for your company

The OPCount offers your company decisive advantages to increase the efficiency and reliability of your hydraulic systems. The early detection of impurities in the hydraulic fluid prevents costly breakdowns and unnecessary repairs. This significantly reduces operating costs, as maintenance measures can be planned in a targeted and forward-looking manner.

Precise monitoring helps to extend the service life of machines and systems. Components such as pumps, valves and cylinders are protected against abrasive wear, which increases reliability and operational capability. At the same time, the OPCount makes it easy to document the measurement results. The integrated printer and export options facilitate data processing and ensure complete traceability.

Optimizing your hydraulic systems together

The OPCount from ARGO-HYTOS is a reliable particle counter for the accurate monitoring of oil cleanliness in hydraulic systems. With its ability to detect contamination at an early stage, it makes a significant contribution to reducing operating costs and extending machine service life.

Its flexibility, ease of use and the possibility of seamless integration make it an indispensable tool. Companies that depend on reliable processes and high efficiency in particular benefit from it.

Accurate oil monitoring is not only a decisive factor for the performance, but also for the sustainability of machines. ARGO-HYTOS is continuously developing its technologies to provide companies with even smarter and more efficient solutions for oil cleanliness monitoring.

Would you like to find out more about ARGO-HYTOS hydraulic technology solutions or discuss a specific project with our experts? Then get in touch with us. We look forward to advising you in a personal meeting.

With over 27 years of experience in various leadership roles in production, logistics, and procurement, and a distinguished background in manufacturing companies in the automotive and hydraulics industries, Mr. Markus Munz will significantly contribute to achieving ARGO-HYTOS's strategic goals.

"I am looking forward to leading ARGO-HYTOS into the next growth phase and further expanding our innovative strength," said Markus Munz. "Our customers and partners can rely on a dedicated team working together to continuously improve efficiency, competitiveness, and operational excellence. The focus will also be on optimizing processes and increasing customer satisfaction through flexibility and reliable performance."

Mr. Stefan Schindler, who previously held the position of CMO of the ARGO-HYTOS Group AG, has left the company. Dr. Marcus Fischer will now take over the responsibilities of the CMO in addition to his CEO duties. This consolidation of responsibility for strategy, marketing, sales, and development under the CEO allows ARGO-HYTOS to more quickly and efficiently turn market and technology trends and customer needs into new products.

"Our goal is to drive innovation and offer our customers added value in functionality, efficiency, and economy in the further development of their machines and systems while always being at their side with the highest flexibility and implementation speed. By consistently focusing on market requirements, we strengthen our position as a reliable and forward-looking partner and remain competitive in the long term," said Dr. Fischer.

Hydraulic drives are both efficient and flexible to use. They can be easily adapted to specific requirements and are used to control speeds, power transmission or precise positioning. Modern solutions such as “Power on Demand” from ARGO-HYTOS also reduce energy consumption. This is because the drive is only activated when it is actually needed.

Thanks to their robust design and extremely long service life, hydraulic drives reduce downtimes and significantly increase the efficiency of machines. Find out all about the solutions and benefits of hydraulic drives from ARGO-HYTOS in this article!

Hydraulic drives: Efficient power transmission for demanding applications

Hydraulic drives are used in many branches of industry to move machines and systems with great precision and power. The drives efficiently transmit signals, force, torque and energy via the hydraulic fluid.

The high power density of these drives is particularly noteworthy. Large forces are generated in a small space. This means that both compact and powerful designs can be realized in a wide variety of machines - from smaller machine tools to large construction machines.

Hydraulic drives are also characterized by particularly low wear. Thanks to lubrication by hydraulic oil, the components are less susceptible to wear - even under high loads. This not only ensures a long service life for the components, but also reliable operation under demanding conditions.

The precise control makes hydraulic drives the first choice for applications where a high level of accuracy is required. By regulating movement, force and torque, the drives ensure precise positioning of the axes of machine tools, for example. If required, this is also possible in tolerance ranges of a few hundredths of a millimeter.

The combination of ductile materials and the hydraulic fluid's ability to absorb shocks and impacts extends the service life of the mechanical components and increases the reliability of the system.

What are the advantages of hydraulic drives?

• High power density
• Low wear
• Precise control
• Impact and shock absorption
• Flexibility

What are the main components of hydraulic drives?

Hydraulic drives consist of several key components that work together to achieve particularly efficient conversion and transmission of energy. Each of these components plays a specific role in the overall process and contributes to the performance of the system.

The hydraulic pump is at the heart of a hydraulic drive. It generates pressure and volume flow, without which energy transmission would not be possible.

Actuators, such as hydraulic cylinders and hydraulic motors, convert the hydraulic energy generated by the system into mechanical movement.

Control blocks and valves regulate the flow of hydraulic fluid and control the direction, speed and force of the actuators.

On the one hand, the hydraulic fluid serves as an energy carrier; on the other hand, it also lubricates the components within the drive, thereby preventing excessive wear. Hydraulic fluid also acts as an effective coolant that dissipates the heat generated in the system.

The task of the lines and hoses is to transport the hydraulic fluid through the system. They have to withstand high pressures and are therefore designed to be particularly robust and durable.

Filters and coolers ensure that the hydraulic fluid remains clean and at operating temperature over long periods of time. These components maximize the service life of the system by preventing contamination and excessive heat build-up.

Decentralized hydraulics with “power on demand”

Decentralized hydraulics are based on the principle of providing hydraulic power directly at the point of use. This means that it does not have to be distributed from a central source via long pipes. Instead, decentralized hydraulics involves installing smaller, independent units that are connected directly to the consumer.

This concept reduces the distance that the hydraulic fluid has to travel. This also minimizes the losses that normally occur during transmission via pipes.

One of the main advantages of decentralized hydraulics is its flexibility. The systems can be quickly and easily adapted to changing operating conditions.

Decentralized hydraulic systems are also characterized by reduced heat generation. In conventional, centralized hydraulic systems, high flow losses or throttling often occur, which generate heat. By providing the power locally, the waste heat in the system is reduced.

This not only extends the service life of the hydraulic components, but also reduces the need for additional cooling systems. As less energy is lost in the form of heat, the overall performance and reliability of the machine can improve.

Applications in mobile machinery

Decentralized hydraulic systems are used in mobile machines such as excavators or agricultural vehicles. This allows the available hydraulic power to be utilized as efficiently as possible. By using smaller, local pumps and intelligent controls, the power can be provided as required. This significantly reduces energy consumption and increases machine flexibility at the same time.

Possible applications

• Miniature pumps on the actuators, which can be switched on and off as required, offer efficient use of hydraulic power.
• By using variable-speed drives, the speed can be adapted to the current power requirement and throttle losses can be reduced.
• With an intelligent control system that uses sensors to monitor the power requirement, the power supply can be adjusted in real time.
• The use of several hydraulic circuits in one system (multi-circuit applications) makes it possible to control several functions simultaneously or independently of each other.
• With demand flow control, the pump only ever delivers the required amount of hydraulic fluid.

Application in industrial automation

In industrial automation, decentralized hydraulics offer advantages in terms of flexibility and scalability. Systems can be easily expanded or adapted and downtimes can be minimized thanks to a decentralized structure.

Advantages

• Additional control units can be easily integrated without having to redesign the entire system.
• In a decentralized system, a fault remains limited to one unit, allowing other parts of the system to continue working.
• Each unit can be serviced independently, reducing maintenance times and increasing productivity.

“Power on Demand” from ARGO-HYTOS

The “Power on Demand” system from ARGO-HYTOS is a compact and intelligent, decentralized hydraulic solution. The system is based on BLDC technology (brushless DC motors). This unit combines tank, pump, motor, control unit and the complete valve technology in one compact system. This was specially developed for use in mobile machines.

The control is pressure-, speed- or position-based, which enables flexible adaptation to the requirements of the application.

Advantages of the “Power on Demand” system

• The system minimizes energy losses thanks to the short wiring distances and demand-oriented operation.
• A particularly robust design, the use of proven components and the user-oriented plug & play approach ensure simple integration and low maintenance.
• The “Power on Demand” system is very quiet in operation and is characterized by low energy consumption and minimal heat generation.

Would you like to find out more about our hydraulic drive solutions? Would you like to discuss the versatile application possibilities of “Power on Demand” and other hydraulic solutions in a personal meeting? The ARGO-HYTOS team of experts will be happy to help you find the right solution for your specific requirements.

Get in touch with us today and discover the benefits of our innovative hydraulic solutions for your applications. Visit our contact page and arrange your non-binding consultation appointment!

I am very pleased about the trust that the Board of Directors has placed in me by appointing me CEO of ARGO-HYTOS. I know about the strength of ARGO-HYTOS from my past 17 years with the company. Together with our strong global teams, it will be my pleasure to lead the company into a successful future.
Our current number one challenge is for sure the unfavorable market environment with recessions in nearly all industries and regions we are serving. Additionally, this is coupled with the negative consequences of a high inflation period on material, labor and energy costs after COVID-19. We are taking the needed measures to adapt ourselves to the market demands and are preparing a lean organizational structure for further profitable growth in the future.
Opportunities I see many for us, we simply need to recall our strengths and the value propositions of ARGO-HYTOS, such as products with an excellent performance and quality, an extensive know-how of markets, being close to our customers, innovative technical solutions for various applications and not to forget, speed and flexibility to the market. We have to recall and foster these strengths to continue to be recognized as an innovative and reliable partner for our customers.

What leadership principles do you value most and how do you plan to implement them at ARGO-HYTOS?

All principles we have defined in our ARGO-HYTOS leadership program are important. Today, I would like to emphasize the principles “inspiring action” and “self-reflection”. It is our duty as managers and leaders to motivate and inspire our teams to seize our opportunities and solve given challenges. We need to explain the big picture and strategic direction we want to take. For this we set ambitious and smart goals and have to provide guidance to our employees as well. We act as a team and are in close exchange and communication, be it on the management or operational level. I regularly explain my view on our way forward in our management and team meetings.
Additionally, as CEO of a mid-size company, I will be closer to our sales teams and our customers in the future.
Self-reflection is of great importance, too. We must ask ourselves regularly whether we are on the right track, whether we are taking the right measures and whether these still fit in with a changing environment. We need to calibrate our actions from time to time. Getting regular feedback from teams and peers helps us to develop as individuals and as a team and to reflect on our own behavior.

If we traveled a few years into the future, what would you like to have achieved at ARGO-HYTOS?

I see ARGO-HYTOS as a strong player in the hydraulic market, especially in off-highway applications. We will not be the full-liner, not providing a huge range of all hydraulic products, but be recognized as filtration, analytics and system solution supplier by our OEM and distributors, providing highly efficient solutions with an excellent cost-benefit ratio, following our mission and purpose – “EVERYTHING HYDRAULIC BEYOND EXPECTATIONS”. We are seen as a development partner supporting our customers in making their products ready for the technological transition in off-highway towards more efficiency and sustainability while maintaining high productivity.
I see us as a solid pillar and strong division in VOITH Turbo, representing one of the growth areas of VOITH. By then, our global footprint has significantly grown in Asia and Americas.

How do you see ARGO-HYTOS contributing to the broader industry and global challenges, such as sustainability and technological advancements?

I strongly believe that hydraulics will play an important role in future off-highway machines and industrial applications. We are contributing to sustainability already today with efficient products, be it with our filters or valves. With better efficiency in filtration, we achieve longer lifetime and save resources. With our piloted spool-in-spool design of proportional valves, we save energy, just to give two examples.
Our R&D is working on new solutions for even higher energy efficiency, like the hydraulic power-on-demand approach or load sensing solutions, providing hydraulic power depending on the demand of the machine, following the “just enough” principle. Furthermore, in cooperation with our colleagues at VOITH Turbo, we are working on additional drive solutions for electrified machines, enlarging our future product offering.

What role do you see digital transformation playing in the future of ARGO-HYTOS and how will it impact the company’s operations?

Digital transformation plays a role in nearly all areas of our business. Some examples: We are using an AI-based expert tool to support our sales in customer service. We are offering our products, especially for our distribution partners, in a web shop. With the implementation of our new ERP-backbone SAP S/4 and related IT solutions, we will extend digitalization in our plants in logistics, in the automation of processes, digital shopfloor management and maintenance of machines.
Our products also benefit from digitalization, for example by providing digitally controlled assistance systems for automized or autonomous machines, by monitoring the condition in our customer’s machines or by providing digital twins of our products in the future, for easy selection and operation.

Whether in mobile machines or industrial applications: The high-quality poppet valves from ARGO-HYTOS increase the performance and efficiency of your systems. Find out all about the technical advantages of poppet valve technology in this article.

How are poppet valves technically designed?

Poppet valves consist of a housing, a valve seat, a spring and a movable valve element. The housing protects the internal components from external influences. The valve seat acts as a sealing surface that regulates the flow of the fluid. These components ensure a reliable seal and prevent the fluid from flowing through the valve when it is closed.

The movable valve element - often in the form of a cone or ball - is actuated by the pressure difference and the spring. When closed, the spring presses the valve element against the seat, interrupting the flow.

If the pressure in the system exceeds the set value, the force of the fluid works against the spring. This lifts the valve element, allowing the fluid to flow through.

The function of poppet valves is based on the precise movement of the sealing element. When opening, the element moves away from the seat to release the flow. The valve element is returned to the closed position by the spring force when the pressure in the hydraulic system drops. The spring force ensures that the valve reacts quickly and reliably and interrupts the flow when required.

ARGO-HYTOS poppet valves are designed to handle high operating pressures while allowing precise control of the fluid flow. The choice between poppet and ball seat valves depends on the specific application. Cone poppet valves ensure better sealing at higher pressures, while ball poppet valves are particularly easy and reliable to use.

What are the features of the different poppet valves?

Poppet valves are characterized by their different designs, each of which offers specific applications and advantages. The most common types are ball poppet valves, cone poppet valves and disc poppet valves.

The advantages of ball poppet valves

Ball poppet valves use the name-giving ball as a sealing element. It prevents the fluid from flowing back by being pressed onto the seat by the fluid pressure. This design is often used in check valves, where it reliably prevents the backflow of fluids. Ball poppet valves are particularly robust and can work effectively under various conditions, as the ball fits easily into the seat.

• They are easy to manufacture and therefore inexpensive.
• They are particularly effective as a check valve. This is because the ball is pressed firmly onto the seat by the fluid pressure and thus prevents backflow.
• Thanks to their simple design, ball poppet valves are insensitive to contamination and mechanical loads.

The advantages of cone poppet valves

Cone poppet valves have a ground, guided cone sealing element that enables very precise sealing. This design requires a high degree of accuracy in the manufacture of the cone to ensure optimum sealing. Due to their versatility, poppet valves are often used as pressure relief valves, check valves or directional control valves. They offer excellent tightness and are ideal for applications that require precise flow control.

• The ground cone provides a precise seal, which is particularly important for applications with high pressure requirements.
• The cone poppet valve can be used as a pressure relief valve, check valve or directional control valve, making it flexible for different system requirements.
• The cone shape provides an efficient seal, minimizing leakage and improving the performance of the entire hydraulic system.

The advantages of disc poppet valves

Disc poppet valves function by means of a plate-shaped sealing element with a small stroke range and large cross-section. These valves are designed for applications in the low pressure range. They are often used as shut-off valves or for simple pressure control - for example in filter elements. The cross-section enables a high flow rate with minimal pressure loss.

• The large cross-section allows a high flow rate at low pressure. This is ideal for applications with low pressure requirements.
• The plate-shaped design enables a small stroke range, which facilitates use in space-limited applications.
• These valves are suitable for applications such as filter elements where simple and cost-effective pressure control is required.

What makes poppet valves efficient and reliable?

Poppet valves provide a positive and non-positive seal that completely prevents leaks. This feature eliminates the need for additional leakage oil lines and maximizes system performance.

Thanks to their design, poppet valves open immediately on actuation and have a short stroke, resulting in a fast response time. This is particularly useful in applications where fast control is required - for example in high-speed machinery and precision control applications. The simple design of the poppet valves results in low costs in relation to the long service life.

Due to their design, poppet valves are less susceptible to contamination. The basic design minimizes the ingress of particles, which reduces maintenance requirements and extends the service life of the valve.

Poppet valves are often designed as pilot operated valves, allowing them to work with lower actuating forces. This feature reduces energy consumption and enables the use of smaller actuator elements. The long service life of poppet valves helps to minimize downtimes and ensure operational safety.

Poppet valves from ARGO-HYTOS

ARGO-HYTOS offers a wide range of poppet valves that meet various requirements in hydraulic systems. The available valve types include directional control valves, check valves, non-return valves, throttle check valves and pressure relief valves. These valves are available in both direct-operated and pilot-operated versions. Depending on the requirements, the valves can be used as screw-in or modular valves.

The valves are actuated either magnetically or hydraulically - depending on the specific application. For special applications, ARGO-HYTOS also offers valves that are suitable for potentially explosive environments. The explosion-proof valves are certified to ATEX/IECEx standards and offer maximum safety in demanding environments.

The selection and dimensioning of the valves depend on the specific requirements of the application. These include the pressure range, the volume flow and the mode of operation (normally open or normally closed). For applications that require precise control and high flow capacities, we recommend the use of valves with particularly fast response times.

Areas of application for ARGO-HYTOS poppet valves

Valves from ARGO-HYTOS are used in numerous applications. In mobile machinery, such as excavators and rollers, poppet valves ensure the precise control of hydraulic systems that perform lifting and lowering movements. In agricultural vehicles, including tractors and harvesting vehicles, poppet valves ensure even power transmission. In this way, they help to optimize fuel consumption.

In municipal utility vehicles used for road maintenance and cleaning, poppet valves control complex hydraulic systems. Poppet valves are also indispensable in industrial applications. In injection molding machines, they ensure precise motion sequences or provide stable pressure control in hydraulic presses. In CNC machines, they contribute to the precise positioning of machine tables and axes.

Learn more about poppet valves from ARGO-HYTOS

ARGO-HYTOS poppet valves are an efficient, cost-effective solution for a wide range of hydraulic applications. Their robust design and ability to handle high pressures and flow rates make them a valuable component of modern hydraulic systems. By combining precise control, minimal leakage and fast response time, poppet valves help to optimize system performance. They also reduce operating costs.

Would you like to find out more about our portfolio or design a customized solution for your hydraulic systems with our experts? Then get in touch with us and let our experts advise you in a personal meeting!

A pressure relief valve is primarily used for safety. It has the task of limiting the pressure in a system. In this way, it protects the hydraulic components installed in the system and the connected consumers from excess pressure.

In this article, you will learn how pressure relief valves work and how they are used in various applications. Discover how ARGO-HYTOS optimizes the performance and safety of your hydraulic systems with precise and reliable solutions.

What is the basic principle of pressure relief valves?

A pressure relief valve is used in hydraulic systems to limit the pressure in a system. In the rest position, the pressure relief valve is closed. It is set to a specific opening pressure that corresponds to the maximum permissible pressure in the system.

A pressure relief valve reacts to the pressure in the flow direction upstream of the valve. As soon as the pressure in the system reaches the set value, the valve opens and returns the excess volume flow directly to the tank. When the pressure has dropped to a safe level again, the valve closes automatically. This ensures that the hydraulic system remains within safe operating limits and prevents damage to components such as hoses, pumps and cylinders. This extends the service life of the equipment and increases operational safety.

What types of pressure relief valves are there?

Direct operated pressure relief valves and pilot operated pressure relief valves are the two types of pressure relief valves used in hydraulic systems.

Directly controlled pressure relief valves

• The valve opens against a closing force, which is usually applied by a spring. If the pressure drops, the valve closes again. One example of such a valve is the SR1A-B2/HxxL-CE1017 pressure relief valve from ARGO-HYTOS. It increases safety in hydraulic systems thanks to its outstanding stability and low hysteresis.
• These valves are usually used for small to medium volume flows of up to around 60 l/min. They are ideal for applications where precise pressure control and fast response to pressure changes are required.

Pilot operated pressure relief valves

• These pressure relief valves consist of a main stage and a pilot stage. The pilot stage continuously monitors the pressure in the system. If the pressure exceeds the preset value, the main stage opens. As soon as the pressure falls below the set pressure again, the pilot stage closes and the main stage follows. One example is the VPN2-10/MR pressure relief valve from ARGO-HYTOS, which offers high flow rates and excellent pressure control.
• Pilot operated pressure relief valves allow a smaller flow rate spread, resulting in a flatter pressure rise as the flow rate increases. These valves are used for larger volume flows and are particularly suitable for main pressure safety devices.

ARGO-HYTOS offers a wide range of pressure relief valves that are optimized for specific applications as well as for general hydraulic systems. The valves make a significant contribution to the operational safety and efficiency of hydraulic systems. They do this by preventing overpressure situations and thus extending the service life of the components.

Which construction types of pressure relief valves exist?

The choice between poppet and spool designs for pressure relief valves depends on the specific requirements of the application. These include:

• Pressure range
• Volume flow
• Precision of pressure control

Poppet valves are characterized by their tightness and precision. They react quickly to pressure changes. This makes them the first choice for applications where fast and precise pressure control is required.

Spool valves offer better control and enable flatter characteristic curves. This means that the pressure increase is lower as the volume flow increases. They are more robust and can handle larger flow rates, making them suitable for applications where high flow rates are required.

Built-in valves and modular designs offer different advantages depending on the specific application and space requirements. Built-in valves are relatively easy to install. They are compact and space-saving, making them ideal for applications with limited space.

Modular versions offer greater flexibility. They can easily be used and retrofitted in conjunction with Cetop valves. As a result, additional functions such as secondary safety devices and shock valves can be easily integrated. This modularity enables adaptation to different system requirements and provides a flexible solution for complex hydraulic systems.

Application of pressure relief valves in hydraulic systems

Pressure relief valves are used in a wide range of applications in hydraulic systems to ensure safe and efficient operation. Their primary task is to protect the system from overpressure.

For primary protection, pressure relief valves should be located near the pump and secured against unauthorized adjustment. This location ensures that the pressure is controlled immediately before it affects other parts of the system.

For secondary protection, pressure relief valves can be installed at other strategic points in the hydraulic system. For example, they can be placed downstream of other valves or on consumers such as cylinders or motors to provide additional protection. This secondary protection not only protects the components from overpressure. It also serves as protection against external influences or forces that could act on the system.

For applications that fall under the Pressure Equipment Directive 2014/68/EU, such as pressure vessels and systems, ARGO-HYTOS offers special PED-certified and TÜV-tested pressure relief valves. They not only ensure operational safety, but also meet the legal requirements for pressure systems.

The strategic positioning and selection of suitable pressure relief valves are crucial for the protection and durability of hydraulic systems. They make a significant contribution to preventing system failures and ensuring safety in demanding industrial applications.

Examples of the use of pressure relief valves in practice

Pressure relief valves from ARGO-HYTOS are used in a wide range of practical applications. They are used in construction machinery to protect hydraulic systems from overpressure and thus ensure the safety and longevity of the machines. In industrial hydraulic systems, they ensure precise pressure regulation and prevent damage to sensitive components.

They are also used in agricultural technology. There, they ensure the safe operation of hydraulic systems in tractors and other agricultural machinery.

Expert advice on pressure relief valves

The various types of pressure relief valves and their diverse designs offer a tailor-made solution for almost any hydraulic application. Whether for primary or secondary protection or for special requirements in accordance with the Pressure Equipment Directive 2014/68/EU: choosing the right valve is crucial for the efficiency and safety of your hydraulic system.

ARGO-HYTOS offers a wide range of pressure relief valves. They are optimized for both small and large volume flows and impress with their high precision and reliability.

Would you like to find out more about pressure relief valves? Or are you interested in a customized solution for your application? Then get in touch with the experts at ARGO-HYTOS. We offer you comprehensive advice and support in selecting and implementing the most suitable solution for your needs.

Visit our contact page. Get advice from experienced specialists to fully exploit the potential of ARGO-HYTOS pressure relief valves for your company.

By detecting and analyzing wear particles in real time, machine failures can be prevented at an early stage and the service life of components can be extended. The use of OPCom FerroS particle monitors is particularly important in applications such as ball screw drives and other heavily loaded systems.

The sensors are a cost-effective solution for wear monitoring and help to reduce operating and follow-up costs. In this article, you will learn everything you need to know about the functionality and benefits of OPCom FerroS particle monitors from ARGO-HYTOS. We will also tell you how you can contribute to the optimization of your machines.

The functional principle of OPCom FerroS particle monitors

The OPCom FerroS particle monitors from ARGO-HYTOS are advanced wear sensors. They are used for the continuous monitoring of ferromagnetic wear particles in hydraulic and lubrication systems. The sensors work according to an innovative principle in which ferromagnetic particles are attracted and collected by an integrated permanent magnet.

A central component of the OPCom FerroS wear sensor is a planar coil that is integrated into an oscillating circuit. When ferromagnetic particles hit the coil, the parameters of the oscillating circuit change in proportion to the amount of particles collected.

These changes are converted into normalized values that indicate the degree of saturation of the coil. As soon as the maximum degree of saturation is reached, the magnetic field can be automatically compensated, releasing the collected particles. This makes the wear sensor maintenance-free and enables continuous monitoring of a hydraulic system without the need for manual, time-consuming inspections.

Continuous monitoring by the sensor also makes it possible to record and predict wear processes in real time. This enables predictive maintenance. Potential machine failures can be detected at an early stage and avoided before defects occur.

For example, the OPCom FerroS can be used in wind turbine gearboxes, to monitor the wear of drive components. This can extend the service life of the machines. Expensive, unproductive machine downtimes become largely superfluous.

How does the monitoring of wear particles with OPCom FerroS work?

During the operation of hydraulic systems and machines, the components used gradually wear out. This causes metallic particles to enter the oil, the number of which increases as the element wears. The OPCom FerroS sensor is the first sensor on the market that enables effective monitoring of this type of contamination. It is based on the principle of capacitive measurement of ferromagnetic particles in the oil.

The wear sensor measures the amount of ferromagnetic particles in the oil. It converts this information into a proportional output signal of 4 to 20mA. It indicates the degree of damage to the monitored devices. Continuous monitoring makes it possible to monitor the condition of the machines in real time. In addition, preventive maintenance measures can be planned in good time to avoid expensive breakdowns and repairs.

The OPCom FerroS wear sensor is operated with a voltage of 22 to 33 VDC. It can monitor both fine and larger particles. This enables a comprehensive analysis of the wear situation in the machines. By combining the signals, a complete picture of the machine condition can be created. This enables precise monitoring and timely maintenance.

This technology offers numerous advantages, such as a longer service life for machine components, reduced operating costs and improved machine reliability. The ability to continuously monitor wear particles is particularly important in demanding industrial applications. It significantly improves the efficiency and safety of production processes.

The use of OPCom FerroS sensors in combination with the LubMon Connect cloud solution also enables a modern and comprehensive monitoring solution. It is based on real-time data and supports predictive maintenance. For local usage of this sensor, you can combine it with LubMonVisu.

What are the advantages of OPCom FerroS sensors compared to laser-based monitoring systems?

OPCom FerroS sensors offer a reliable solution for monitoring wear particles in oil that differs significantly from laser-based systems.

A major advantage of the sensor is that it does not require small flow channels. These are often necessary when using laser-based systems. As a result, the sensor can effectively measure both large particles and fine particles below 4 micrometers. This ability to detect a wide range of particles makes it particularly valuable for applications where comprehensive monitoring is required.

Another key advantage of OPCom FerroS sensors is their independence from water and air bubbles in the oil. This is particularly important in gearboxes where such interference factors can occur frequently. This independence enables the sensor to carry out precise measurements. This is because the results are not affected by the presence of water or air bubbles.

The sensor's integrated operating hours counter saves the values even after a power failure. As a result, it continues to work from the last saved value after the interruption. This function enables continuous monitoring and ensures that no operating time is lost.

By detecting wear and damage at an early stage, the OPCom FerroS sensor enables predictive planning of maintenance measures. This helps to minimize downtime and maximize machine efficiency. The sensor also offers various communication options, including an analog 4-20mA output signal and digital interfaces such as RS232, CANOpen and SAE J1939.

Advantages of the OPCom FerroS sensor

These are the advantages of the sensor at a glance:

• Captures both large and fine particles under 4 micrometers
• No interference from small flow channels as with laser-based systems
• Accurate measurements even in the presence of water or air bubbles in the oil
• Ideal for use in gearboxes and other applications with frequent interfering factors
• Reliable performance in demanding environments
• Integrated operating hours counter that stores values even after power failures
• Enables predictive maintenance planning
• Minimizes downtime and reduces operating costs
• No manual inspections required
• Support for machine predictive maintenance
• Can be connected to the ARGO-HYTOS cloud solution

Get advice on the OPCom FerroS sensor from ARGO-HYTOS

The OPCom FerroS sensor from ARGO-HYTOS offers your company a comprehensive solution for monitoring wear particles in hydraulic systems. The precise measurement of both large and fine ferromagnetic particles in demanding environments makes the solution an economical alternative to laser-based monitoring systems.

The sensor has proven itself in gearboxes and wind turbines in particular thanks to its reliable performance and integrated operating hours counter. This saves the data even after a power failure and then continues counting. The early detection of wear enables efficient maintenance planning and minimizes downtimes. This ultimately reduces operating costs and extends the service life of the machines.

Would you like to find out more about how the OPCom FerroS sensor can improve the efficiency and reliability of your machines? Then get in touch with us and let our experts advise you in a personal consultation!

In this article, you will learn how flow dividers and flow combiners work and in which areas of application they are used. We also reveal the advantages of ARGO-HYTOS components.

The general function of flow dividers and flow combiners

Flow dividers and flow combiners are used to precisely regulate the oil flow in hydraulic systems. A flow divider divides the input oil flow into two usually equal volume flows. This enables an even distribution of the hydraulic energy to several actuators. This is particularly important when the synchronized movement of two or more actuators is required.

Flow combiners combine the returning volume flows according to their division or combination ratio to form a discharge flow. This function is essential to combine the return flow from two actuators and ensure uniform movement. Different division ratios can be realized, which increases the flexibility of these components.

A major advantage of flow dividers and flow combiners is that they are largely independent of the load. Even with different load and pressure ratios, they work with high accuracy. This is why the components are mainly used in complex hydraulic applications where precise control is required.

Thanks to their ability to operate independently of load and pressure differences, flow dividers and flow combiners make a significant contribution to the stability of hydraulic systems.

What is the difference between flow dividers and flow combiners?

Flow dividers and flow combiners fulfill different functions in hydraulic systems. A flow divider distributes the input oil flow into two or more equal volume flows, allowing several actuators to be operated simultaneously and synchronously. This enables particularly smooth movement, for example of loading platforms or lifting platforms.

A flow combiner, on the other hand, combines the returning volume flows from several actuators into a single outgoing flow. This function synchronizes the movement of the actuators and ensures that they work evenly.

How do flow dividers and flow combiners from ARGO-HYTOS improve hydraulic systems

ARGO-HYTOS has various models of flow dividers and flow combiners in its portfolio that are characterized by high precision and reliability.

The SFD2F-B4/I flow divider and combiner is designed for volume flows of up to 40 l/min and operating pressures of up to 350 bar. It divides the input oil flow evenly and compensates for deviations using specially matched orifices and compensation springs. This enables a high level of accuracy, even with different loads and pressure ratios.

SFD2F-B4/I is ideal for applications where low volume flows are required and precise synchronization of the actuators is necessary.

The SFD2F-D4/I flow divider and combiner can handle volume flows of up to 150 l/min at 350 bar. Like the B4 model, the D4 also divides the oil flow evenly and ensures precise control of the return flows. Thanks to its robust design and high flow capacity, it ensures reliable synchronization of movements in larger hydraulic systems.

Both models are largely load-independent and offer high accuracy, even with load and pressure differences. These properties make them a reliable solution for various industrial applications. Further details and illustrations can be found in the data sheets.

A special variant in the ARGO-HYTOS portfolio are the so-called flow dividers with end position compensation. These special shapes compensate for the tolerances in the movement of the connected cylinders or motors in their end position. Without such compensation, differences in the end positions of the cylinders or motors could lead to uneven movements. The end position compensation ensures that the actuators operate reliably and with maximum precision at all times.

For which applications are flow dividers and flow combiners suitable in different industries?

ARGO-HYTOS flow dividers and flow combiners are used in numerous applications in the following areas:

• Construction machinery
• Agricultural machinery
• Industry

Their ability to precisely control and synchronize hydraulic systems makes them indispensable components in a wide range of industries.

In construction machinery, flow dividers and flow combiners are often used in synchronization controls. These ensure that two cylinders move back and forth evenly despite different loads.

A typical example is the raising or lowering of loading levels. Without synchronization, the cylinders could work at different speeds, which would cause the load to slip. Flow dividers ensure a smooth process and therefore increase the safety and efficiency of the machine.

Another area of application is the differential lock. It synchronizes the speed between two hydraulic motors. This application is particularly important in vehicles that have to drive on uneven or slippery surfaces.

For example, they ensure a smooth drive on snow, ice, slippery roads and mud. They do this by preventing one wheel from spinning while the other is stationary. This improves traction and ensures better control of the vehicle.

In agriculture, flow dividers and flow combiners help to increase the efficiency and performance of machines such as tractors and harvesters. They enable the hydraulic cylinders to move smoothly, resulting in more precise control and better utilization of the machines.

The hydraulic components are also used in industrial applications. In production systems, they ensure the even distribution of hydraulic energy, which increases the efficiency of the machines and extends their service life. The precise control of the oil flow by flow dividers and flow combiners means that the machines require less maintenance.

The use of flow dividers and flow combiners in various applications significantly improves the performance and reliability of hydraulic systems. The technical components are therefore responsible for higher productivity and a longer service life of the machines. This ultimately makes operation more profitable and efficient.

Contact us for customized solutions for hydraulics

Flow dividers and flow combiners from ARGO-HYTOS are high-quality, technical components that optimize the efficiency and reliability of hydraulic systems in many industries. Their ability to precisely control the flow of oil and synchronize the movement of hydraulic cylinders ensures smooth processes. It also increases safety and productivity - whether in construction machinery, agricultural machinery or industrial applications.

Thanks to the high accuracy and load-independence of these components, irregular movements and traction problems are reliably prevented.

Would you like to find out more about our high-quality flow dividers and flow combiners? Or do you need a customized solution for your hydraulic systems? We will be happy to help you at any time. Simply and conveniently use our contact options and send us your message.

Our team of experts will help you find the optimum solution for your specific, individual requirements. Let us drive your projects forward together and increase the efficiency of your machines. We look forward to your inquiry and to supporting you with your hydraulic challenges.

The Board of Directors of the ARGO-HYTOS Group AG has appointed Dr. Marcus Fischer as the new CEO. He succeeds Erich Hofer, who will be leaving the Group after more than 10 years, the last three of which as CEO.

Mr. Hofer has held the position of CFO since 2017 and CEO since 2021 and will leave the ARGO-HYTOS Group AG in June 2024. We would like to thank Mr. Hofer for his steady commitment to ARGO-HYTOS.

Dr. Marcus Fischer is not a new member of the team. He has been with ARGO-HYTOS for 17 years. He started as Head of Development in 2007, and in 2010 he joined the management of the ARGO-HYTOS GmbH in Kraichtal and simultaneously took on the role of the Group CTO. At the beginning of 2016, he took over the position of the COO of the ARGO-HYTOS Group AG and is responsible for both development and all of the Group's production plants.
Dr. Marcus Fischer is an experienced technology and industry expert who is very familiar with our markets, customers and suppliers. We are delighted to have found an internal successor for the CEO position in him.

Dr. Marcus Fischer comments on his election as follows: "I would like to thank for the trust that has been placed in me with the appointment as CEO and I am very much looking forward to shaping the future of ARGO-HYTOS as the off-highway division of VOITH Turbo in these exciting times of technological change."

Until further notice, Dr. Fischer will perform the dual function of CEO and COO.

Proportional valves enable the fine adjustment of pressure and flow. Thanks to their ability to react quickly to dynamic load changes, they make a significant contribution to increasing efficiency and optimizing machine performance. Find out in this article what advantages proportional valves from ARGO-HYTOS can offer your company.

The advantages of proportional valves

In contrast to conventional switching valves, which only operate in open or closed states, proportional valves offer the option of adopting any intermediate position. This feature makes them a valuable component for the precise adjustment of pressure and volume flow to different operating situations.

The efficient control of hydraulic systems with proportional valves depends on several critical factors. Firstly, the accuracy of the valve control is crucial to ensure an optimal response to load changes. Secondly, the dynamic characteristics of the hydraulic system, such as response time and sensitivity of the control elements, play an essential role in overall efficiency.

With the best possible integration capability of the valves into existing system architectures, seamless function is ensured without extensive adjustments. Proportional valves from ARGO-HYTOS reduce operating costs, improve machine performance and extend the service life of the systems.

Choosing the right proportional valve for optimum system performance

Choosing the right proportional valve is crucial for the performance of hydraulic systems. Which valve is the right one for a specific application depends largely on the individual requirements.

Proportional valves can be divided into different categories, including:

• Proportional directional control valves
• Flow control valves
• Pressure control valves
• 2- and 3-way pressure compensators, which are available from ARGO-HYTOS in built-in and modular design

Proportional directional control valves such as PRM2-04 provide precise control over the position and speed of actuators in a hydraulic system. These valves are ideal for applications that require sensitive control.

Flow control valves such as the SF32P-C3/H are designed to maintain constant flow regardless of pressure fluctuations. This is particularly useful in systems with variable loads.

Pressure control valves such as SR1P2-A2 play a central role in maintaining a constant pressure in a hydraulic circuit. This is true even when load conditions change.

The selection of the right valve type should not only take into account the specific requirements of the application. The ambient conditions under which the valve is operated must also be considered.

How do you determine the correct dimensioning of a hydraulic valve?

The dimensioning of a hydraulic valve is directly dependent on the pressure and volume flow in the application. To ensure the optimum performance of a hydraulic system, the valve must be precisely matched to the actual requirement.

The volume flow that is to flow through the valve largely determines the size of the valve. The pressure that the system must withstand, in turn, influences the choice of material and the design of the valve.

In addition to the specific requirements of the application, users should also consider the ambient conditions such as temperature, contamination and humidity under which the valve will be operated.

With ARGO-HYTOS proportional valves, you can rely on advanced technology and high-quality materials. This ensures that the valves function reliably and deliver precise results even under the harshest conditions.

How is a proportional valve controlled?

A proportional valve is usually controlled by an electromagnetic control unit. It is either integrated into the valve (on board) or mounted externally in a control cabinet. These configurations offer flexible solutions for different industrial applications and make it possible to adapt the control of the valve to specific operating conditions.

Modern control systems offer both analog and digital control options. They ensure precise control over the valve functions and facilitate integration into complex machine systems.

The ability to communicate via CANopen significantly extends the functionality of the valves. The interface enables seamless networking and communication between the various components of a hydraulic system. CANopen is particularly efficient in automated environments where fast and reliable data transmission is required.

There are three different control concepts for proportional valves:

• Systems without feedback
• Systems with internal feedback via a valve position sensor
• Systems with external feedback, where a sensor measures the controlled parameter in the circuit

Systems without feedback are often simpler and cheaper, but offer less precision. Internal feedback improves the accuracy of valve positioning. And external feedback provides the highest control accuracy by adjusting the performance of the system in real time. Each of these concepts has its specific advantages and disadvantages and must be selected according to the requirements of the specific application.

Why is regular maintenance of proportional valves important?

The maintenance and servicing of valves and hydraulic systems ensures a long service life and long-term fault-free operation. Regular inspections ensure that the systems function optimally and that potential failures can be detected and avoided at an early stage.

In particular, compliance with the hydraulic media standards is of crucial importance. Hydraulic oils of classes HM and HV according to ISO 6743-4 should be used,

• to ensure the best properties for operation under variable temperatures and,
• to maximize the aging resistance of the oil.

In addition, the cleanliness of the hydraulic oil must be taken into account in accordance with the ISO 4406 standard. A minimum oil cleanliness class of 19/16/13 must be maintained. The cleanliness classes are important in order to minimize the accumulation of particles in the system. These could otherwise lead to wear or blockages in the hydraulic components.

By adhering to these standards and carrying out regular checks, expensive repairs and system failures can be avoided. Companies that implement proactive maintenance strategies benefit from greater reliability of their machines. They also enjoy an improvement in operational efficiency and an extension of the overall service life of their equipment. Investing in regular maintenance is therefore a critical factor for the long-term reliable, economical operation of hydraulic systems.

What challenges arise when controlling with hydraulic proportional valves?

The control of proportional valves in hydraulic systems poses several challenges. One of the main factors is the sensitivity of the valves to the effects of temperature and contamination. Temperature fluctuations can change the viscosity of the hydraulic oil, which affects the responsiveness and performance of the valve. Contamination in the system can lead to wear and blockages, which further impair functionality.

In addition, proportional valves require a more complex control strategy compared to conventional switching valves. This complexity results from the need to define precise control parameters that are tailored to the specific requirements of the application. Vibrations and instabilities caused by external factors and influences can further complicate control quality. They require robust control mechanisms and precise calibration of the systems.

Discover the possibilities of hydraulic proportional valves from ARGO-HYTOS

ARGO-HYTOS is your competent partner when it comes to reliability and efficiency in sustainable hydraulic systems. Rely on our solutions that are specially tailored to your individual needs. To ensure that you find the optimum solution for your requirements, please get in touch with our team of experts. Simply use our contact form for a personal consultation.

This is particularly important in applications where precise control of movement sequences is essential. Throttle valves contribute to efficiency and precision in automated processes. They are used in a wide range of industrial and mobile applications. ARGO-HYTOS is your high-performance partner when it comes to high-quality throttle valves.

How do throttle valves work and how are they designed?

Throttle valves are used to regulate the oil flow in hydraulic systems with high precision. Their basic technical design makes it possible to change the flow cross-section as required, creating a flow resistance. The modification of the flow cross-section enables precise control of the flow rate. This allows precise control of the movement speeds of hydraulic consumers such as cylinders and motors.

With throttle valves, the volume flow through the valve depends on the opening cross-section and the pressure difference. This results from the pressure upstream of the valve minus the pressure downstream of the valve. The volume flow is calculated as follows:

Throttle valves are available in various designs, which differ in terms of complexity and flow cross-section adjustment options. In their simplest form, the valves have a fixed flow cross-section that provides a constant flow resistance.

More complex variants have an adjustable flow cross-section that allows even finer tuning of the flow rate. This variability makes adjustable throttle valves particularly valuable for applications where high-precision control of the speed of movement is required. By specifically adjusting the flow cross-section, users can optimally adapt the performance of the hydraulic system to the requirements.

Where are flow control valves used?

Flow control valves are always required in hydraulic systems when the focus is on precise control of movement speeds. Their areas of application are diverse and specifically tailored to the requirements of the systems.

The valves are particularly suitable in hydraulic systems in which the load pressures remain relatively constant. In addition, varying the speed of the consumers depending on the load is acceptable or even desirable. This enables flexible adjustment of the system performance without the need for separate control of the extension and retraction speeds.

In addition, certain designs of flow control valves, such as the cone throttle screw-in valves, can function as shut-off valves, which further increases their applicability.

Throttle valves and their areas of application

Throttle valves are characterized by the following features:

• Use with constant load pressures
• No separate control of retraction and extension speed required
• Use as a shut-off valve in certain versions

Practical example: Control of lifting tables and assembly presses

Examples of applications for throttle valves include controlling the lowering speed of lifting tables and regulating the pressing speed of assembly presses. In both cases, the throttle valve enables sensitive adjustment of the speed. This is crucial for the safety and efficiency of operation.

With lifting tables, the precise control of the lowering speed ensures that loads can be lowered safely and in a controlled manner. With assembly presses, the exact adjustment of the pressing speed ensures even and precise processing.

Even more application possibilities with throttle check valves

Throttle check valves significantly expand the range of possible applications even further. These valves enable precise flow control in one direction while allowing unimpeded flow in the opposite direction.

This is particularly useful in applications where speeds need to be controlled in both directions. This feature is also helpful when load lowering is required in hydraulic systems. By throttling the volume flow, the pressure in the system can be controlled more effectively. This leads to improved performance and safety.

How do you make the right choice for throttle valves?

The effectiveness and functionality of hydraulic control systems can be significantly improved by selecting throttle valves that are adapted to the application. The most important criteria that must be taken into account when making a selection include

• Pressure range
• Flow rate (also referred to as volume flow)
• Connection size and type

Throttle valves from ARGO-HYTOS cover a wide range of applications. They offer solutions that are tailored to the specific needs of each hydraulic system.

The following points should be considered when selecting a throttle valve:

• The pressure range must meet the requirements of the hydraulic system.
• The flow rate (volume flow) must match the required speed regulation of the consumers in the system.
• The connection size and type must match the hydraulic connections in the system.
• When selecting throttle check valves, particular attention must be paid to the direction of flow. This is because these valves allow precise control of the flow in one direction. In contrast, they allow the flow in the opposite direction unhindered.

ARGO-HYTOS offers a wide range of flow control valves designed for various industrial and mobile applications. The high-quality valves enable precise control of movement speeds in hydraulic systems and therefore help to optimize system performance.

Maintenance and service life of flow control valves

With regular maintenance of the flow control valves, the functionality and performance of the components can be maintained over the entire life cycle. Flow control valves from ARGO-HYTOS are known for their long service life and low maintenance requirements. The service life of a flow control valve depends on various factors. These include the operating conditions, the quality of the hydraulic oil used and the frequency of maintenance interventions.

To ensure the maximum service life and optimum performance of ARGO-HYTOS flow control valves, we recommend the following measures:

• Check for signs of wear and mechanical damage as part of regular inspections
• Careful removal of dirt and deposits that can impair the mobility of the valve
• Use of high-quality hydraulic oil and regular changes to minimize deposits and wear
• Ensuring that the installation is carried out in accordance with the technical specifications to prevent malfunctions

By observing these maintenance guidelines, the service life of the flow control valves can be extended and unrestricted function can be ensured over long periods of time. Regular maintenance of quality valves from ARGO-HYTOS pays off in the long term. This reduces downtime and significantly lowers the total cost of ownership.

Conclusion: The importance of flow control valves in hydraulic systems

Flow control valves are used to control and regulate hydraulic systems. Their ability to precisely influence the movement speeds of consumers makes them a key component in hydraulic technology. The selection of the right flow control valve, based on pressure range, flow rate, connection size and type, is crucial for the performance of the system.

ARGO-HYTOS offers a wide range of high-quality flow control valves. They are designed for different applications and are characterized by durability and minimal maintenance requirements. Regular maintenance of the valves maximizes their service life and ensures the efficiency of the entire hydraulic system.

The experts at ARGO-HYTOS will be happy to help you select the optimum flow control valves at any time. Contact us to find out more about our products. We will also be happy to tell you how we can optimize the performance of your hydraulic system.

It filters the air drawn in from outside and at the same time protects the system against the ingress of dirt. ARGO-HYTOS offers ventilating filters that not only keep out dirt and humidity. They also simplify maintenance and extend the service life of the system. Find out here how ventilating filters work and what specific advantages the components offer for hydraulic systems.

Technical function of aeration filters

Ventilating filters enable efficient air exchange in hydraulic systems, which compensates for pressure fluctuations in the hydraulic tank. At the same time, they effectively filter the intake air and keep out dirt particles. A drying granulate also absorbs humidity from the ambient air drawn in.

A check valve ensures that the exchange of air with the environment is reduced. This means that less dirt can enter the tank from the environment. The precise adjustment of the response pressure of the check valve to the system requirements ensures efficient protection and optimum operating conditions.

How are ventilating filters used?

The main task of ventilating filters is to protect hydraulic systems from contamination by the outside air. At the same time, the necessary air exchange for pressure compensation in the hydraulic tank is ensured. Pressure compensation is important because the oil level in a hydraulic tank can vary. The reasons for this are:

• Temperature fluctuations
• Operating conditions
• Movement of working cylinders used

Without adequate air exchange, the fluctuations could lead to unacceptable pressure conditions in the tank. This could impair system performance or even cause damage.

Technically speaking, ventilating filters fulfill two main functions. They let air into the tank to prevent negative pressure. And they let air out to prevent overpressure.

During this process, they effectively filter particles and impurities from the air. These could otherwise enter the system and contaminate the hydraulic fluid. Modern ventilating filters are also able to absorb humidity from the air. This prevents the formation of condensation in the tank and thus minimizes quality degradation of the hydraulic fluid used.

Various operating parameters must be taken into account when selecting ventilating filters. These include, for example, the maximum air flow rate. This is required to effectively regulate the pressure in the tank without compromising filter efficiency. We would be happy to help you select the right filter for your application. Please feel free to contact our experts at any time.

What types of contamination can occur in hydraulic systems?

Various types of contamination can occur in hydraulic systems, which can pose a considerable risk to the functionality and service life of the system. The most common types of contamination include solid particles such as dust, sand and metal abrasion. Liquids, especially water, can also enter the system and cause corrosion and degradation of the hydraulic fluid. Chemical contamination caused by oxidation or decomposition of the hydraulic fluid also impairs system performance.

Contamination can lead to a variety of problems, including increased wear on pumps, valves and other hydraulic components. They can reduce the efficiency of the system, lead to leaks and, in the worst case, cause system failures.

The precision of hydraulic controls can be impaired by contamination, which jeopardizes the safety and reliability of the entire system. Therefore, effective filtration and regular maintenance is crucial to ensure the cleanliness of the hydraulic fluid. It also minimizes the risks posed by contamination.

Comprehensive portfolio of ventilating filters from ARGO-HYTOS

ARGO-HYTOS offers a broad portfolio of ventilating filters that can be used to protect hydraulic systems from contamination efficiently, economically and sustainably.

In addition to standard ventilating filters, our product range also includes variants with patented Vandalism Proof features that offer reliable protection against unauthorized access.

The safety system ensures that the ventilating filters can only be removed with the special tool supplied. This makes it considerably more difficult to remove the filter or fill in dirt via the tank interface.

Filling and ventilating filters from ARGO-HYTOS are available in capacities of 200 l/min for filling filters and up to 850 l/min for ventilating filters. If required, they can also be equipped with additional vandalism protection.

Ventilating dryers and ventilating filters with desiccant not only filter the intake air, but also absorb humidity using an efficient drying granulate. These filters offer protection against the ingress of solid particles as well as humidity, snow, spray or rainwater.

They are designed for nominal flow rates of up to 400 l/min and water absorption of up to 280 g. These filters are ideal for venting and bleeding oil tanks in hydraulic and lubrication systems, gearbox housings, transformers and fuel tanks.

Special features and advantages of ARGO-HYTOS ventilating filters

ARGO-HYTOS ventilating filters offer solutions that go far beyond the basic function of air exchange. They are specifically designed to maximize the efficiency and reliability of hydraulic systems. This is because they offer a range of unique benefits and special features.

A key element is the double check valve, which minimizes air exchange and thus significantly reduces the ingress of dirt and dust. This leads to a longer service life of the system.

Another important feature is the swash protection. It prevents oil from the tank from entering the ventilating filter or escaping into the environment. This ensures the cleanliness and safety of the operating area. This is a real plus for occupational safety and the environment.

The integration of dipsticks directly on the ventilating filter allows the oil level to be checked easily and accurately. The clogging indicator shows the optimum time for filter maintenance. Our patented Vandalism Proof ventilating filters, which can only be removed with a special tool, offer additional protection against theft and contamination.

Another advantage is the option of integrating ventilating filters into the head sections of tank-mounted return filters. This integration saves costs by eliminating the need for an additional interface for the ventilating filter. Potential leakage points are also avoided. Maintenance work is significantly simplified by using the head section of the return filter on the housing to accommodate the ventilating filter.

Special features & advantages in a compact overview

• The double check valve reduces air exchange and minimizes the ingress of dirt.
• A swash protection prevents oil from escaping from the tank.
• Integrated dipsticks make it easy to check the oil level.
• The integrated clogging indicator signals the optimum time for filter maintenance.
• The patented Vandalism Proof design ensures reliable protection against unauthorized removal or contamination.
• Integration in tank-mounted return filters saves costs and simplifies maintenance.

Conclusion: The importance of ventilating filters in hydraulic systems

Ventilating filters are an indispensable component for maintaining the efficiency, safety and longevity of hydraulic systems. The filters protect the system from the many dangers that can arise from contamination. They do this by filtering the intake air and effectively trapping humidity and particles. The components reliably prevent pressure imbalances and ensure the cleanliness of the hydraulic fluid in the long term.

ARGO-HYTOS offers your company exactly the right products for your specific needs with an extensive portfolio of filter technologies. We would be happy to advise you in a personal meeting on the many advantages that our ventilating filters offer you in daily use. Get in touch with us right away!

Our team at ARGO-HYTOS Poland offers complex customer service from concept to the final product as well as after-sales care. One of the company's most distinguishing features is the ability to provide a whole range of services tailored to the specific customer's requirements.

The cooperation between customer and supplier is extended beyond the delivery of the final product, such as: power pack, filter unit or set of sensors. A qualified team assists the customer in the process of launching a given application and provides support during periodic maintenance and repairs. Service technicians use high-end diagnostic equipment to analyze a wide range of parameters of hydraulic equipment. In addition, they are aided by a range of filter units and oil sensors.

"Our biggest advantage is that we have a mobile service, enabling us to respond quickly in case of an emergency. As a result, we can support our customers where they need us most." – Piotr Baran, Service Engineer.

Main tasks of service in ARGO-HYTOS Poland

Diagnostic services:

• Assistance in the selection of spare parts
• Diagnostics of hydraulic systems
• Tests of prototypes (new hydraulic blocks)

Installation and maintenance:

• Assembly, commissioning and maintenance of power hydraulics systems
• Maintenance and repairs of filtration units (FMA)

Support services:

• Equipment rental
• Oil service
• Support of the quality department (complaint analysis)
• Training and consulting on proper service and operation of the applications

Innovations in Service: Introducing the Universal Mobile Power Unit

Building upon our dedication to innovation and customer-centric solutions, ARGO-HYTOS Poland proudly introduces the Universal Mobile Power Unit . This groundbreaking device exemplifies our commitment to pushing the boundaries of service excellence, combining our extensive service experience with advanced engineering expertise.

“The premise of the project has been universality at the highest possible level, great mobility, simplicity of operation and control.” – Engineer Wojciech Zarzycki.

The device is the size of a standard UMPC 045 filter unit and weighs 142 kg. The unit is based on a double gear pump with a 4-section block with return and pressure filtration.

Features of the device:

• quick commissioning in any location thanks to the use of a 1.5 kW motor with a 230C/50Hz power supply and a standard plug
• possibility of obtaining any pressure at the block outputs in the range of 10- 220bar; an additional output with miniBOOSTER - a hydraulic pressure intensifier allows you to obtain pressure up to 800ba
• control of pressure by an electro-hydraulic system
• possibility of controlling three different actuators
• the option to connect a hose crimper to an external mobile hydraulic and select the appropriate setting for the chosen hose size
• possibility of connecting to an external accumulators charging unit and entry charging parameters for automatic operation
• filtration outside (without using the oil inside the tank), transferring oil from the tank outside to another tank and the other way around (refilling the tank)

Control of the required operating status is possible thanks to the use of a 7' PLC controller with touch screen. The system has many additional sensors and a system of alarms improving user safety.

Ready to experience unparalleled service excellence? Contact us today to discover how ARGO-HYTOS Poland can elevate your operations and empower your success.

With 1,700 square meters, Zator offers sufficient space for production and enables a flexible and fast response to customer needs as well as today’s market demands. Hydraulic blocks and systems are shipped as prototypes or in smaller quantities to the ARGO-HYTOS entities in Northern and Eastern Europe. The Polish entity established a network of twelve distributors due to its market presence over the past years. This network covers the most important parts of Poland and enables about 30% of sales. The rest of the business is done directly with OEMs or end customers.

Products for future markets
While the German site concentrates on filtration, Poland has developed into a center for the development and production of sensors for Condition Monitoring in hydraulics. The expert fields of Fluid Management and Condition Monitoring are united under one roof. The attractive product portfolio serves as one of ARGO-HYTOS’ most important future market offerings. The impressive growth rates of 30% in each of the years 2020 and 2021 prove this potential.

Despite difficulties caused by the crisis such as disruptions to the supply chain, Zator continues to be on course for success in a market characterized by a high pace of innovation. More and more customers are demanding plug-and-play sensor technology while the trend moves toward standardized systems such as iLink, remote software and cloud solutions. Hydraulic service is also developing as a business sector where Zator is excellently equipped.

Attractive and well connected
The central and convenient location proves to be an important advantage: Zator is close to important highways and the Krakow Airport. The area is known to tourists for its nature and history while also being an attractive place to live. Around 70 people are currently employed at the entity, about a third of whom are engineers.

The proximity to the university cities of Krakow and Katowice has a positive effect on the search for specialists. ARGO-HYTOS provides fluid management equipment free of charge to the teaching institutions, thus actively promoting employer branding in the region. The Zator entity is a very attractive employer for students who have completed their training. A full-time position is on the horizon – with a renowned global player.

Mateusz Krupnik, Designer and Software Engineer at ARGO-HYTOS in Zator, talks about his job and future opportunities:

What are your responsibilities at ARGO-HYTOS?
I work as a Designer and Software Engineer. Currently, I am focusing on a project in the Condition Monitoring field where I am mainly responsible for engineering and product support. For example, we use intelligent sensor technology to monitor the condition of a machine to increase efficiency and minimize costs through optimized machine utilization.

How did you become part of the ARGO-HYTOS team?
During my studies at AGH University of Science and Technology in Krakow, I completed a summer internship at ARGO-HYTOS in Zator. Since I enjoyed the work a lot and could also develop professionally, I applied for an apprenticeship in the technical department next to my studies. They not only gave me this opportunity but also offered me a permanent position later on.

What did your training look like?
I learned about all departments during my training: from assembly and technical support to the design of simple hydraulic power units and blocks or complex hydraulic power units. This allowed me to gain valuable experiences in hydraulics, mechanics, automation and programming, which I still apply in my current role.

What makes your work in an international company special?
The job is very diverse, exciting and creative as different experiences and backgrounds come together in an international team. Naturally this leads to different and innovative approaches. Additionally, there is the unique opportunity to brush up and improve one’s language skills. Overall, ARGO-HYTOS really allows me to develop my professional perspectives in a decisive manner.