Hydraulic oil filter

(1) Filtration accuracy First, determine the cleanliness level of the stains according to the needs of the hydraulic system, and then select the filter accuracy of the oil filter according to the table according to the cleanliness level. The most commonly used hydraulic oil filter element in construction machinery has a nominal filtration degree of 10μm.

Since the nominal filtration accuracy cannot truly reflect the filtration capacity of the filter element, the diameter of the largest hard spherical particle that the filter can pass under the specified test conditions is often used as its absolute filtration accuracy to directly reflect the initial filtration of the new filter element. ability.

The most important criterion for evaluating hydraulic oil filter elements is the β value measured according to ISO4527-1981E (multi-pass test), that is, the oil mixed with the standard test powder is circulated through the oil filter multiple times, and the oil inlet and outlet are on both sides The ratio of the number of particles.

(2) Flow characteristics The flow and pressure drop of the filter element through the oil are important parameters of the flow characteristics. The flow characteristics test should be carried out according to the ISO3968-91 standard to draw the flow-pressure drop characteristic curve. Under the rated oil supply pressure, the total pressure drop (the sum of the pressure drop of the filter housing and the pressure drop of the filter element) should generally be below 0.2MPa.

(3) The strength of the filter element should be subjected to a rupture-impact test according to the ISO2941-83 standard. The pressure difference that drops sharply when the filter element is damaged should be greater than the specified value.

(4) Flow fatigue characteristics shall be subjected to 100,000 cycles fatigue test according to ISO3724-90 standard.

(5) The test of hydraulic oil should be tested according to ISO2943-83 standard to withstand the pressure flow to verify the compatibility of the filter material with the hydraulic oil.

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