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Selection and location of hydraulic filter

Where is the hydraulic filter located

As an integral part of modern mechanical engineering, hydraulic systems already play a vital role in various industrial applications. From automobile manufacturing to aerospace, from industrial production to construction engineering, hydraulic systems are widely present in every aspect of our lives.

In this complex and powerful system, hydraulic filters is a key component to ensure the robust operation of the system. The location of hydraulic filters plays an important role in the effective performance of the system. Wrong choice of location can reduce the service life of the system. Today we will delve into the location of hydraulic filters in the hydraulic system and reveal their importance in the hydraulic system.

What is hydraulic filter?

Hydraulic filter is a component within a hydraulic system.Hydraulic filter in hydraulic systems remove particulate matter from the hydraulic fluid.The filter element catches contaminants and prevents them from re-entering the fluid flow and damaging other pieces of equipment further downstream. They come in different types, each having unique benefits. Next we will learn more about the different types and specific locations of hydraulic filters.

what is hydraulic filter

What types of hydraulic filters are there?

In hydraulic systems, hydraulic filters are one of the most common components. The correct selection can significantly improve the reliability of the system and effectively eliminate potential failures. When it comes time to replace filters, it’s crucial to make sure you consider the exact location of each filter in your system. Such considerations can ensure smooth operation of the system and prevent potential problems.

Pressure filter

The location of this filter is usually between the pump outlet and the rest of the components in the hydraulic system. Placing filter media in the pressure line prevents contaminants generated in the pump from entering other components such as valves. Prevent the spread of such undesirable elements throughout the system, providing maximum protection for components immediately downstream. The high-pressure filter element is in the high-pressure pipeline and ensures that hydraulic oil that meets the working requirements is supplied to one or several working parts as needed. High-pressure filter elements usually use synthetic fiber filter media or semi-synthetic fiber filter media.

Return oil filter

The location of return filters are on the return line of the hydraulic system. When the equipment is running, debris will be generated due to machine wear, and some of the debris will enter the oil. In addition, after the oil returns in the system for a period of time, it’s easily contaminated by external intrusion. The function of the oil return filter is to filter. This part of the impurities eventually allows the clean oil to flow back into the oil tank for continued use. Since the impurities in this part are very small. The filtration accuracy requirements for the oil return filter element are also relatively high. Generally, the filtration accuracy of the oil return filter is between 10 and 30um, which is a fine filter element. The oil return filter is located in the most effective position to control system pollution and plays a vital role.

Oil suction filter

The location of the filter is on the suction port of the pump or in the reservoir and connected to the suction line leading to the pump. High-efficiency filters are usually not placed on the suction side because the high pressure differential can cause pump failure. Fine filters on the suction side of the pump require very large filters to handle the flow and have extremely low pressure drop.

The filtration precision of this type of filter element is generally 100 to 180um. And the material is generally stainless steel, which has the characteristics of high temperature resistance, corrosion resistance, and long service life. At the same time, it can effectively filter large solid particles in the oil, with high filtration efficiency, ensuring the purity of the oil, and low original pressure loss. The unique design and excellent performance of the oil suction filter element provide the first gate for the hydraulic system. Made a great contribution to the liquid filtration of hydraulic systems.

Circulation filter element

This filter element is located on the oil tank circulation circuit. It is suitable for hydraulic systems that have high requirements for cleanliness. It is often used with coolers.

Replace imported filter elements

The substitute imported filter products produced by Btlas Filter include Hydac, Pall, Mahle,Donaldson, MP Filtri, etc. Users in need are welcome to call us for consultation and ordering.

hydraulic filters

How to maintain Hydraulic filter

1. Drain the original hydraulic oil before replacing it, check the oil return filter element, oil suction filter element, and pilot filter element to see if there are iron filings, copper filings or other impurities attached. If so, there may be a hydraulic component failure. After inspection and elimination, clean the system.

2. When changing hydraulic oil, replace all hydraulic filters (return filter, oil suction filter, pilot filter) simultaneously.Otherwise it is equivalent to not changing it.

3. Identify the grade of the hydraulic oil. If hydraulic oils of different grades and brands are not mixed, they may react and deteriorate to produce floc. The general recommendation is to use excavator-specific oil.


From the above we can see that whether it is the suction filter element. The oil return filter element or the pressure filter element, they are all essential parts of the hydraulic system. Hydraulic filters are an indispensable device on the conveying medium pipeline. They typically install at the outlet end of pressure reducing valves, pressure relief valves, fixed water level valves, or other equipment. Their purpose is to eliminate impurities in the medium, ensuring the normal operation of valves and equipment.

Reference blog :Hydraulic Filters: A Basic GuideHow to Clean and Change Hydraulic Filter in 3 Easy StepsDemystifying Hydraulic Filters: Your Comprehensive Guide to Functionality and MaintenanceHydraulic Filter Elements.

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