Acting hydraulic filter is to filter all kinds of impurities in the hydraulic system occurs. Its main sources remain in the hydraulic system after cleaning the mechanical impurities, such as water rust, sand casting, welding slag, iron, paint, paint peel and cotton scraps, external contaminants entering the hydraulic system, such as through the oil filler and anti- dust ring, etc. into the dust; impurities produced during work, such as hydraulic seals by debris role in the formation of metal powder relative movement produced by wear, gelatinous fluid produced by oxidation deterioration, asphaltenes, carbon residue and the like.

 

Fluid collected contaminants are various forms of the appliance to filter material trapping pollutants called filters. Magnets magnetic to adsorb contaminants known as magnetic filter. There are also electrostatic filter, separate filters. In the hydraulic system, where the collected fluid contaminating particles are Yigai called hydraulic filters. Currently the most widely used hydraulic filters in addition to use of a porous material or wound thin slit method to intercept pollutants, there is a magnetic filter and electrostatic filters are used in hydraulic systems.

 

After the above-mentioned contamination of hydraulic oil, hydraulic oil with circulation function, everywhere from the damaging effects will seriously affect the normal operation of the hydraulic system, hydraulic components such as a very small gap between the relative moving parts (in terms μm) and section flow holes and crevices stuck or blocked; destroy film relative motion between the parts, scratches clearance surface, increasing internal leakage, reduce efficiency, increase heat, exacerbating oil chemistry, so that the oil deterioration. According to production statistics, more than 75 percent in the hydraulic system failure is due to the hydraulic oil mixed due to impurities, thus maintaining the cleaning fluid, to prevent contamination of oil, the hydraulic system is very important.

 

General hydraulic filters are mainly composed of filter (or strainer) and housing (or frame). Made up of numerous small gaps or holes on the filter fluid flow area constitutes, therefore, when mixed with the oil in a size larger than these tiny impurities gap or hole, it is blocked from the oil filtration. Due to the different hydraulic systems have different requirements, and to complete filtration of impurities mixed in the oil is not possible, sometimes you do not have demanding.

 

Filtering accuracy requirements of various hydraulic systems