| Rated flow | 220 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
Return-flow filter
Return-flow filters filter the dirt produced from the entire fluid system before it flows back into the tank. Return-flow filters are installed in the return line upstream of the tank and serve, among other things, to protect the pump. Return-flow filters are offered as inline filters, tank installation filters and tank superstructure filters. It is important that the return-flow filter outlet is always below the hydraulic oil level to avoid oil foaming. ... Read more
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| Rated flow | 130 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 220 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 110 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 80 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 50 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 70 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 160 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 140 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 190 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 135 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 120 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 45 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 70 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 80 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 115 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 120 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 110 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 70 l/min |
| Bypass valve set pressure | 1.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
| Rated flow | 115 l/min |
| Bypass valve set pressure | 2.5 bar |
| Contamination display | Electrical contamination indicator Possibility of mounting for clogging indicator Mechanical contamination indicator |
Due to the installation position of the return filter, it does not fulfill the protective function of a pressure filter. Return flow filters also ensure that the cleanliness class required for a hydraulic system is maintained. The purity class specifies the number of permissible particles per 100 ml. Unlike pressure filters, return flow filters only have to withstand a relatively low pressure and are therefore less complex in design.
Contamination of hydraulic oil
Solid contamination of hydraulic oil can have various causes: Contamination penetrating from the outside, such as damaged tank seals. Contamination occurring in the hydraulic system, such as material removal. Contamination already present in the hydraulic oil, e.g. caused by the assembly of components.
Effective pollution particles are often invisible to the human eye. To ensure the reliable functioning of system components over a longer period of time, an oil cleanliness class is specified for these components. How clean hydraulic fluids should be is specified in DIN ISO 4406/1999. According to this DIN, particle sizes are classified as follows: > 4 µm, > 6 µm and > 14 µm. It is recommended that hydraulic pressure filters be equipped with a contamination indicator.
Contamination indicator
The contamination indicator, also called maintenance indicator, shows how high the dirt capacity of the filter is. For this purpose, the dynamic pressure is measured. This enables economical utilization of the filter contamination capacity. The display is made by mechanical or electrical switches or indicators.
Bypass function
Return filters with a bypass function are also offered. To protect the filter, the back pressure in the pressure filter is measured. If the back pressure is too high due to a heavily contaminated filter element, the bypass valve opens. Part of the unfiltered hydraulic oil is now led past the filter and enters the tank and thus the hydraulic oil circuit again. The protection of the hydraulic components is no longer given.
Contamination of hydraulic oil
Solid contamination of hydraulic oil can have various causes: Contamination penetrating from the outside, such as damaged tank seals. Contamination occurring in the hydraulic system, such as material removal. Contamination already present in the hydraulic oil, e.g. caused by the assembly of components.
Effective pollution particles are often invisible to the human eye. To ensure the reliable functioning of system components over a longer period of time, an oil cleanliness class is specified for these components. How clean hydraulic fluids should be is specified in DIN ISO 4406/1999. According to this DIN, particle sizes are classified as follows: > 4 µm, > 6 µm and > 14 µm. It is recommended that hydraulic pressure filters be equipped with a contamination indicator.
Contamination indicator
The contamination indicator, also called maintenance indicator, shows how high the dirt capacity of the filter is. For this purpose, the dynamic pressure is measured. This enables economical utilization of the filter contamination capacity. The display is made by mechanical or electrical switches or indicators.
Bypass function
Return filters with a bypass function are also offered. To protect the filter, the back pressure in the pressure filter is measured. If the back pressure is too high due to a heavily contaminated filter element, the bypass valve opens. Part of the unfiltered hydraulic oil is now led past the filter and enters the tank and thus the hydraulic oil circuit again. The protection of the hydraulic components is no longer given.
What is a return line filter and what is it used for?
A return line filter is a filter that is used in hydraulic systems. It is used to remove impurities from the return flow of hydraulic oil.
In hydraulic systems, hydraulic oil is used to transfer energy and generate movement. During operation, the oil collects dirt, particles and other impurities. If the oil is not cleaned, this can lead to damage to the components of the hydraulic system.
The return filter is installed in the return flow of the hydraulic oil to remove these impurities. It consists of a filter element that blocks the passage of impurities and only allows clean oil to pass through. This ensures that the hydraulic oil is cleaned before it is reused in the system.
The return line filter is an important component of a hydraulic system, as it helps to maintain the service life and efficiency of the system. Regular maintenance and cleaning of the return filter can improve the performance of the hydraulic system and avoid expensive repairs.
In hydraulic systems, hydraulic oil is used to transfer energy and generate movement. During operation, the oil collects dirt, particles and other impurities. If the oil is not cleaned, this can lead to damage to the components of the hydraulic system.
The return filter is installed in the return flow of the hydraulic oil to remove these impurities. It consists of a filter element that blocks the passage of impurities and only allows clean oil to pass through. This ensures that the hydraulic oil is cleaned before it is reused in the system.
The return line filter is an important component of a hydraulic system, as it helps to maintain the service life and efficiency of the system. Regular maintenance and cleaning of the return filter can improve the performance of the hydraulic system and avoid expensive repairs.
How does a return line filter work and what components does it contain?
A return filter is a component in a hydraulic system that is used to remove impurities from the return flow. The return line filter is usually installed in the return line between the consumer and the tank.
The main purpose of a return line filter is to remove particles and impurities from the hydraulic oil before it flows back into the tank. This helps to extend the service life of the components in the system and ensure proper functioning.
A return line filter consists of several components:
1. Housing: The housing is the outer part of the filter and contains all the other components. It is usually made of metal or plastic and has inlet and outlet connections for the oil flow.
2. Filter element: The filter element is the central part of the filter and usually consists of a fine-meshed metal mesh or a special filter medium. It removes particles and impurities from the hydraulic oil while allowing the oil to flow.
3. Bypass valve: The bypass valve is a safety device that allows oil to flow around the filter element if it is clogged. This prevents excessive pressure in the system.
4. Seals: Seals are provided in various parts of the filter to prevent leaks and ensure proper functioning.
A return line filter should be serviced regularly to ensure that the filter element is not clogged and is working properly. This can be done by cleaning or replacing the filter element, depending on the requirements of the system and the type of contamination.
The main purpose of a return line filter is to remove particles and impurities from the hydraulic oil before it flows back into the tank. This helps to extend the service life of the components in the system and ensure proper functioning.
A return line filter consists of several components:
1. Housing: The housing is the outer part of the filter and contains all the other components. It is usually made of metal or plastic and has inlet and outlet connections for the oil flow.
2. Filter element: The filter element is the central part of the filter and usually consists of a fine-meshed metal mesh or a special filter medium. It removes particles and impurities from the hydraulic oil while allowing the oil to flow.
3. Bypass valve: The bypass valve is a safety device that allows oil to flow around the filter element if it is clogged. This prevents excessive pressure in the system.
4. Seals: Seals are provided in various parts of the filter to prevent leaks and ensure proper functioning.
A return line filter should be serviced regularly to ensure that the filter element is not clogged and is working properly. This can be done by cleaning or replacing the filter element, depending on the requirements of the system and the type of contamination.
Why is a return line filter important in hydraulic systems?
A return filter is important in hydraulic systems to remove impurities from the return flow and thus ensure the operational reliability and service life of the system.
Hydraulic systems work with oil as the working medium, which circulates in a closed circuit. Over time, impurities such as particles, dirt, metal shavings or other foreign bodies can accumulate in the oil.
These impurities can lead to increased wear of the components by getting into the moving parts and wearing them out. They can also cause blockages or obstructions in the hydraulic valves or cylinders, which can lead to malfunctions or system failures.
A return filter is installed in the return flow of the hydraulic system to filter and remove these impurities. The oil is pumped through the filter, which filters out the harmful particles and feeds the cleaned oil back into the circuit.
The use of a return line filter extends the service life of the hydraulic components, increases operational reliability and minimizes downtimes. It is therefore an important component in hydraulic systems to ensure that they function reliably and efficiently.
Hydraulic systems work with oil as the working medium, which circulates in a closed circuit. Over time, impurities such as particles, dirt, metal shavings or other foreign bodies can accumulate in the oil.
These impurities can lead to increased wear of the components by getting into the moving parts and wearing them out. They can also cause blockages or obstructions in the hydraulic valves or cylinders, which can lead to malfunctions or system failures.
A return filter is installed in the return flow of the hydraulic system to filter and remove these impurities. The oil is pumped through the filter, which filters out the harmful particles and feeds the cleaned oil back into the circuit.
The use of a return line filter extends the service life of the hydraulic components, increases operational reliability and minimizes downtimes. It is therefore an important component in hydraulic systems to ensure that they function reliably and efficiently.
How often should a return line filter be maintained and cleaned?
The maintenance and cleaning intervals for a return line filter depend on various factors, such as the type of filter, the contamination load of the system and the operating time. It is generally recommended to maintain and clean a return line filter every 3 to 6 months. However, it is important to consider the manufacturer's instructions and the specific requirements of the filter to ensure that it works properly and that optimum performance is guaranteed.
What types of return line filters are there and how do they differ from each other?
There are various types of return line filters that differ in terms of how they work and where they are used. The most important species are:
1. Coarse filter: These filters remove coarse particles such as sand, dirt or leaves from the water. They consist of a coarse sieve or a filter basket and are usually installed in the water supply pipe.
2. Fine filter: Fine filters remove smaller particles such as rust, sediment or suspended matter from the water. They consist of finer screens or filter media that offer greater filtration accuracy. Fine filters are often used in drinking water or process water systems.
3. Activated carbon filter: These filters use activated carbon as a filter medium to remove organic impurities, odors and flavors from the water. Activated carbon filters are often used in drinking water or aquarium filters.
4. Membrane filter: Membrane filters consist of a semi-permeable membrane that retains particles and impurities while water flows through it. They are often used in reverse osmosis systems or for water treatment.
5. UV filter: UV filters use ultraviolet light to kill bacteria, viruses and other microorganisms and disinfect the water. They are often used in drinking water or pool and spa systems.
The various types of return line filters differ in their filtration accuracy, their flow volume, their maintenance requirements and their area of application. It is important to select the right type of filter for the specific application to ensure effective filtration.
1. Coarse filter: These filters remove coarse particles such as sand, dirt or leaves from the water. They consist of a coarse sieve or a filter basket and are usually installed in the water supply pipe.
2. Fine filter: Fine filters remove smaller particles such as rust, sediment or suspended matter from the water. They consist of finer screens or filter media that offer greater filtration accuracy. Fine filters are often used in drinking water or process water systems.
3. Activated carbon filter: These filters use activated carbon as a filter medium to remove organic impurities, odors and flavors from the water. Activated carbon filters are often used in drinking water or aquarium filters.
4. Membrane filter: Membrane filters consist of a semi-permeable membrane that retains particles and impurities while water flows through it. They are often used in reverse osmosis systems or for water treatment.
5. UV filter: UV filters use ultraviolet light to kill bacteria, viruses and other microorganisms and disinfect the water. They are often used in drinking water or pool and spa systems.
The various types of return line filters differ in their filtration accuracy, their flow volume, their maintenance requirements and their area of application. It is important to select the right type of filter for the specific application to ensure effective filtration.
What are the most common problems or sources of error with return line filters?
The most common problems or sources of error with return line filters can be
1. Constipation: One of the most common problems with return line filters is clogging due to dirt, deposits or particles in the filter. This can reduce the flow rate of the fluid or block the filter completely.
2. Leaks: Return filters can leak if the seals, O-rings or housing are damaged. This can lead to leaks and impair the efficiency of the filter.
3. Wear and tear: Return line filters are subject to a certain amount of wear due to the constant flow of fluids. This can lead to a reduction in filter performance or even to the filter failing.
4. Incorrect installation: Incorrect installation of the return filter can lead to problems. This includes improper alignment, inadequate fastening or incorrect connection to the pipes.
5. Lack of maintenance: If return line filters are not maintained regularly, deposits and dirt can accumulate, resulting in a reduction in filter performance. It is therefore important to clean and check the filter regularly.
6. Material defects: In some cases, material defects or manufacturing faults can lead to problems with return filters. This can lead to cracks, fractures or other defects that impair the filter performance.
It is important to recognize these problems at an early stage and take appropriate measures to maintain the performance and service life of the return line filters.
1. Constipation: One of the most common problems with return line filters is clogging due to dirt, deposits or particles in the filter. This can reduce the flow rate of the fluid or block the filter completely.
2. Leaks: Return filters can leak if the seals, O-rings or housing are damaged. This can lead to leaks and impair the efficiency of the filter.
3. Wear and tear: Return line filters are subject to a certain amount of wear due to the constant flow of fluids. This can lead to a reduction in filter performance or even to the filter failing.
4. Incorrect installation: Incorrect installation of the return filter can lead to problems. This includes improper alignment, inadequate fastening or incorrect connection to the pipes.
5. Lack of maintenance: If return line filters are not maintained regularly, deposits and dirt can accumulate, resulting in a reduction in filter performance. It is therefore important to clean and check the filter regularly.
6. Material defects: In some cases, material defects or manufacturing faults can lead to problems with return filters. This can lead to cracks, fractures or other defects that impair the filter performance.
It is important to recognize these problems at an early stage and take appropriate measures to maintain the performance and service life of the return line filters.
What are the advantages of using return line filters in industrial applications?
The use of return line filters in industrial applications offers several advantages:
1. Protection of the systems: Return filters remove impurities from the fluid that flows back into the system. This prevents these impurities from damaging the system or impairing the function of the components.
2. Extending the service life of components: The use of return filters reduces wear and abrasion on the components. This leads to a longer service life for the system and thus reduces maintenance costs.
3. Improvement in operational safety: Return line filters help to ensure that the system runs smoothly and minimize downtimes. Protection against contamination prevents disruptions and interruptions in the production process.
4. Reduction in maintenance costs: Return filters keep the fluid clean, reducing the need for frequent maintenance. This leads to cost savings and increases the efficiency of the system.
5. Environmental protection: Return line filters contribute to environmental friendliness by removing impurities from the fluid and thus preventing contamination of the environment.
Overall, the use of return line filters improves the performance, reliability and efficiency of industrial systems. They help to reduce operating costs and increase customer satisfaction.
1. Protection of the systems: Return filters remove impurities from the fluid that flows back into the system. This prevents these impurities from damaging the system or impairing the function of the components.
2. Extending the service life of components: The use of return filters reduces wear and abrasion on the components. This leads to a longer service life for the system and thus reduces maintenance costs.
3. Improvement in operational safety: Return line filters help to ensure that the system runs smoothly and minimize downtimes. Protection against contamination prevents disruptions and interruptions in the production process.
4. Reduction in maintenance costs: Return filters keep the fluid clean, reducing the need for frequent maintenance. This leads to cost savings and increases the efficiency of the system.
5. Environmental protection: Return line filters contribute to environmental friendliness by removing impurities from the fluid and thus preventing contamination of the environment.
Overall, the use of return line filters improves the performance, reliability and efficiency of industrial systems. They help to reduce operating costs and increase customer satisfaction.
How do you choose the right return line filter for a specific application?
Selecting the right return line filter for a specific application requires a careful analysis of the requirements and conditions. Here are some steps to consider when selecting a return line filter:
1. Determine the maximum flow rate: Consider how much volume must flow through the filter per unit of time. This is an important factor when choosing the right size of filter.
2. Take the pressure loss into account: Make sure that the selected filter minimizes the pressure loss in the application. Excessive pressure loss can impair the performance of the system.
3. Check the filtration requirements: What kind of particles or impurities need to be removed from the fluid? This determines the filter fineness that is suitable for your application. A finer filter removes smaller particles, but can also reduce the flow rate.
4. Consider the type of filter: There are different types of return line filters, such as compressed air filters, hydraulic filters or oil filters. Select the filter type that best suits your application.
5. Take the maintenance requirements into account: Check how easy it is to maintain the filter. A filter with a simple replacement mechanism for the filter elements can save time and money.
6. Consult a specialist: If you are unsure or have specific requirements, it is advisable to consult a professional who can help you choose the right filter.
It is important that you understand the requirements of your specific application and consider all relevant factors in order to select the right return line filter.
1. Determine the maximum flow rate: Consider how much volume must flow through the filter per unit of time. This is an important factor when choosing the right size of filter.
2. Take the pressure loss into account: Make sure that the selected filter minimizes the pressure loss in the application. Excessive pressure loss can impair the performance of the system.
3. Check the filtration requirements: What kind of particles or impurities need to be removed from the fluid? This determines the filter fineness that is suitable for your application. A finer filter removes smaller particles, but can also reduce the flow rate.
4. Consider the type of filter: There are different types of return line filters, such as compressed air filters, hydraulic filters or oil filters. Select the filter type that best suits your application.
5. Take the maintenance requirements into account: Check how easy it is to maintain the filter. A filter with a simple replacement mechanism for the filter elements can save time and money.
6. Consult a specialist: If you are unsure or have specific requirements, it is advisable to consult a professional who can help you choose the right filter.
It is important that you understand the requirements of your specific application and consider all relevant factors in order to select the right return line filter.