The function of hydraulic filters is to filter various impurities in hydraulic systems. The main ones are mechanical impurities still remaining in the hydraulic system after cleaning, such as rust, casting sand, welding slag, iron filings, paint, paint skin, and cotton yarn crumbs, etc.; External impurities in the hydraulic system, such as oil port and dust ring and other places into the dust; The impurities produced in the working process, such as the debris formed by the hydraulic action of the seal, the colloid and carbon slag produced by the oxidation deterioration of the oil, etc.

The impurities mixed with hydraulic oil, with the circulation of hydraulic oil, will seriously affect the normal work of the hydraulic press system, such as the hydraulic components in the throttle hole and gap blockage; Damage the oil film between the parts of the hydraulic press, increase the internal leakage, reduce efficiency, increase heat, and make the oil deteriorate.

According to production statistics, more than 75% of the fault in the hydraulic system is caused by impurities mixed in the hydraulic oil, so the hydraulic filter is very important to the hydraulic system.