How To Buy A Hydraulic Oil Filter?

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Update time : 2019-12-09 10:26:00

Today Durable Hydraulic Oil Filter Supplier will share with you how to choose a hydraulic oil filter.

When purchasing hydraulic oil filters, you should pay attention to the following:

1.Filtration accuracy

First, determine the cleanliness level of the stains according to the needs of the hydraulic system, and then select the filtering accuracy of the oil filter according to the cleanliness level according to the table. Because 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 newly installed filter element. The most important criterion for the ability assessment of hydraulic oil filters is the β value measured according to ISO4572-1981E (multi-pass test), that is, the oil mixed with the standard test powder is repeatedly circulated through the oil filter, and its inlet and outlet The ratio of the number of particles on both sides.

2.Flow characteristics

The flow rate and pressure drop of the filter element through the oil are important parameters of the flow rate characteristic. The flow rate characteristic test should be performed in accordance with the ISO3968-91 standard to draw a flow rate and pressure drop characteristic curve.

3.Filter element strength

The burst-impact test shall be performed in accordance with ISO2941-83. When the filter element is damaged, the pressure drop sharply should be greater than the specified value.

4.Flow fatigue characteristics

The fatigue test should be in accordance with ISO3724-90. The filter element must undergo a fatigue test of 100,000 cycles.

5. Test of hydraulic oil adaptability

The pressure flow endurance test should be performed according to ISO2943-83 to verify the compatibility of the filter media with the hydraulic oil.


Hydraulic Oil Filter

In addition, we should know how to replace the Hydraulic Oil Filter:

1. Replacement of the filter element of single barrel pre-filtration device:

a. Close the oil inlet ball valve and open the upper end cover. (Aluminum alloy upper end cover needs to use a flat-blade screwdriver to gently pry open from the side notch);

b. Unscrew the drain plug and drain the dirty oil; c. Loosen the fastening nut on the upper end of the filter element. The operator wears oil-resistant gloves to hold the filter element and remove the old filter element upwards. Close the upper sealing ring (the lower end has its own gasket) and tighten the nut; f. Tighten the plug of the drain outlet, cover the upper end cover (note that the sealing ring is properly cushioned), and tighten the bolt.

2. Replacement of the filter element of the double barrel parallel pre-filtration device:

a, close the oil inlet valve of the filter on the side of the filter element that needs to be replaced, close the oil outlet valve after a few minutes, and then unscrew the end cover bolt and open the end cover;

b. Open the drain valve to thoroughly drain the dirty oil to prevent the dirty oil from entering the clean oil cavity when the filter element is replaced;

c, loosen the fastening nut on the upper end of the filter element, the operator wears oil-resistant gloves to hold the filter element, and remove the old filter element vertically upwards;

d. Replace the new filter element, pad the upper seal ring (the lower end has its own gasket), and tighten the nut;

e. Close the blowdown valve, cover the upper end cap (note that the sealing ring is well cushioned), and tighten the bolts.

f. First open the oil inlet valve and then open the air outlet valve. When the oil comes out of the air outlet valve, immediately close the air outlet valve, and then open the oil outlet valve; then operate the other side filter in the same way.

The above is the correct selection method of hydraulic oil filters shared by Oil Filter suppliers. Hope this knowledge can help everyone!