N R W seals

Non-reinforced single-acting wiper seals traditionally designed to be assembled into closed housing grooves are not as effective as metal reinforced wiper seals. It is impossible to reach sufficient contact force against the rod surface and there is also a risk of leakage in the wiper seal housing. In order to improve the effectiveness of non-reinforced wiper seals against the rod surface as well as the static sealing function the movability of the sealing device in the housing cavity must be reduced without creating difficulty at the assembling operation.