1、 Filter material: if the hydraulic oil cylinder is a fake filter material, its surface will turn yellow, or its depth is different, and its performance in building seismic grade and AC voltage withstand test is relatively poor, resulting in its short service life. Now there are filter materials using glass fiber as raw material in the market, because the fiber material of wired glass is an excellent composite raw material, It not only has good performance in building seismic grade and AC voltage withstand test, but also has a long service life. The important thing is that its working hours can be guaranteed to be about 500 hours.

2、 Observe the tightness between the filter materials: the filter element of the hydraulic cylinder is relatively fake and loose in compactness, while the filter materials with very good quality are neat and compact with each other; In order to make the filter element more convenient and quick, the quality of the filter element is good or bad. In addition, you can put the two filter elements into the water storage tank for flushing test, and then let the filter element rotate. In the same situation, the observation of the two filter elements in the work, after a period of rotation, the middle of the two filter elements should cause a relatively obvious difference, in which many bubbles will appear on the surface of the fake filter elements, Moreover, the specification of bubbles is uneven, and the coverage is uneven, but on the contrary, if it is a filter element with relatively high quality, even if bubbles appear, they are all small and uniform.