Sealing device for sealing between hollow cylinder housing and piston rod in self-sustaining hydraulic spanner, has seal ring including outer and inner sealing surfaces brought in sliding contact with housing and piston rod, respectively

摘要

The device has a double seal ring (16) including an outer sealing surface (17) brought in sliding contact with a hollow cylinder housing (2), where the double seal ring is made of PTFE or modified PTFE. An inner sealing surface (18) is brought in sliding contact with a piston rod (6). The outer and inner sealing surfaces are formed as annular circumferential sealing surfaces, which are arranged at a distance from each other and coaxial to a longitudinal axis of the double seal ring. The piston rod is movable relative to the housing.