Rubber seals used for rubber material quality and production through the ring, consisting of one or a few parts of the cover, fixed in a ring or a washer bearing and another ring or gasket contact or the formation of the labyrinth of narrow gap, to prevent leakage of lubricating oil and foreign matter. Fluorine rubber seal ring is made of the copolymer vinylidene fluoride and hexafluoropropylene six and a sealing ring.

 O type rubber sealing ring by PTFE filled with a low friction (PTFE) and ring and a rubber sealing O ring, O ring to provide adequate seal preload, and the PTFE ring wear compensation. PTFE small friction coefficient, static and dynamic friction coefficient. Suitable for high speed reciprocating motion of piston rod of the oil cylinder and the high pressure sealing system. The two step of sealing ring, can achieve zero leakage.