By a wear resistant, low friction filled polytetrafluoroethylene (PTFE) sliding ring and O shaped rubber sealing ring. O-rings provide pre-tightening force, can wear compensation effect of slip ring. It has two-way sealing effect, is suitable for sealing of high pressure, low speed rotary hole hydraulic equipment. Of the specifications of the aperture is less than 40 Φ, split type groove should be adopted.