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Hydraulic Oil Filters Selection Factors

hydraulic oil filters

In hydraulic systems, the selection of hydraulic oil filters is one of the key factors to ensure efficient operation of the system. This article will delve into the important elements of selecting hydraulic oil filters to meet system requirements for cleanliness, flow characteristics, filter strength and adaptability.

hydraulic oil filters

Filtration accuracy: Ensure that the cleanliness level meets system requirements

First, determine the required filtration accuracy based on the cleanliness level of the hydraulic system. The filtration accuracy of hydraulic oil filters is usually measured in μm. And the nominal filtration clarity of common hydraulic oil filter is 10 μm. The ISO4406 standard classifies the filtration accuracy of the filter element into 13/10, 16/13, 18/15, and 19/16, each of which is suitable for the specific requirements of different hydraulic components. Measuring the β value under specified test conditions provides a more intuitive evaluation of the filtration capacity of the filter element.

Flow characteristics: optimize flow and pressure drop

Flow characteristics are another critical parameter that affects the performance of hydraulic oil filters. Conduct flow characteristic tests in accordance with ISO3968-91 standards to develop flow-pressure drop characteristic curves. Under the rated oil supply pressure, the total pressure drop should generally be controlled below 0.2MPa to ensure smooth operation of the system. The flow characteristics test of the filter element should consider the temperature and viscosity of the hydraulic oil to ensure superior performance under different working conditions.

Filter element strength: Verify pressure resistance through rupture-impact test

To ensure the reliability of hydraulic oil filters in the system, it is necessary to conduct a burst-impact test. Tested under the ISO2941-83 standard to check the stability of the filter element when subjected to external impact. For hydraulic systems, to ensure the safety of the system, the hydraulic system requires a pressure difference greater than the specified value when damaging the filter element.

Flow fatigue characteristics: withstand the test of 100,000 cycles

Hydraulic oil filters need to have good flow fatigue characteristics to ensure stability during long-term system operation. According to ISO3724-90 standards, we conduct fatigue testing to ensure that the filter element can maintain reliability after 100,000 cycles.

Test on the compatibility of hydraulic oil: Verify the compatibility of the filter material with hydraulic oil

Conduct a test on the adaptability of hydraulic oil according to ISO2943-83 standard to verify the compatibility of the filter material with hydraulic oil. This test can ensure that hydraulic oil filters can operate stably in different working environments. However they are not affected by the properties of the oil.


Overall, the correct selection of hydraulic oil filters is an important part of ensuring efficient operation of the hydraulic system. By fully understanding the requirements of the hydraulic system. Selecting hydraulic filters suitable for the system based on factors such as filtration accuracy, flow characteristics, filter element strength and adaptability. It will provide a strong guarantee for the stability and reliability of the system.

Reference blog:Hydraulic Filter Elements.Introduction to hydraulic filters.Btlas filter manufacturer for Donaldson filter.The Importance of Hydraulic Filters: Exploring the Donaldson Difference.How to choose filter in hydraulic system. Oil filter elements : improve hydraulic system performance! Donaldson Hydraulic Filters VS Btlas Hydraulic Filters.

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