Door closer piston or door drive piston has closing piston flange and damping piston flange with guiding ring arranged on them whereby two guiding rings are arranged on both sides of sealing rings for protection against contamination

摘要

Door closer piston or door drive piston (1) has closing piston flange (2) and damping piston flange (3) on which guiding ring (10) is arranged. Two guiding rings are arranged on both sides of one of the sealing rings to protect the sealing rings against particles in a fluid medium. Piston also has toothed rod (4) distancing from closing piston flange by damping piston flange.