The metal powder and other mechanical impurities used in the oil circuit of the hydraulic system to keep the oil circuit clean and prolong the life of the hydraulic system.The filter layer of the filter element adopts non-composite glass fiber filter material, which has high strength, high temperature and corrosion resistance, large dirt holding capacity and good filtering performance.The inner support net of the filter element is a 1.5MM thick spiral welded round hole net, which has large supporting force and strong resistance to pressure.