What is the filtration accuracy of hydraulic oil filter element

pageview:5 2025.01.21

 The filtration accuracy of hydraulic oil filter element is an important indicator to measure its performance. The following is a detailed explanation of the filtration accuracy of hydraulic oil filter element:
1、 Common filtering accuracy range
The filtration accuracy of hydraulic oil filters is usually within the range of 3~30 μ m to meet the cleanliness requirements of most hydraulic systems. At the same time, there are also hydraulic oil filter cartridges with a filtration accuracy of 330 μ m. In addition, in certain special cases, such as precision machinery, aerospace and other fields, higher precision filters may be required, such as 2-5 μ m high-precision filters. The filtration accuracy is usually determined by conducting a multi pass test according to the ISO4527-1981E standard, by measuring the ratio of particle numbers (β value) on both sides of the inlet and outlet ports. The filtering accuracy can also be divided into three levels: high, medium, and low, which are 2-5 μ m (high accuracy), 10-15 μ m (medium accuracy), and 15-25 μ m (low accuracy), respectively.
2、 The filtration accuracy of different types of filter cartridges
Oil suction pipeline filter element: Its accuracy is usually 100-180 μ m, which needs to be determined according to the self-priming capacity of the pump to avoid excessive flow resistance and hydraulic pump cavitation.
3、 Factors affecting filtration accuracy
Filter material selection: Fiberglass and metal mesh are common filter material choices, and the specific choice will depend on the accuracy requirements.
Working pressure: The maximum normal working pressure of hydraulic oil filter element is 1.0Mpa, and special filter elements can withstand pressure differentials of up to 32Mpa or even 42Mpa, which can also affect the filtering effect of the filter element.
Working medium: The working medium of the filter element includes general hydraulic oil, phosphate ester hydraulic oil, emulsion, water ethylene glycol, etc. The chemical and physical properties of different media can also affect the filtration accuracy of the filter element.