Abstract: A composite one-piece dynamic lip seal forms a dynamic ring seal between static and dynamic surfaces in a variety of applications requiring fluid sealing. The lip seal body is generally U-shaped in cross section and is principally made from a soft elastomeric material. The seal has ID and OD legs on opposite sides of a cavity in its high pressure end, forming ID and OD lips of the seal, either of which can be the dynamic leg of the seal depending upon the application. A U-shaped energizer spring is integrally bonded to the elastomer and is aligned with the U-shaped cross section of the seal so that ID and OD legs of the spring apply radial spring loading to the ID and OD legs of the seal. A reinforcing ring integrally bonded to the elastomeric body of the seal forms an exterior contact surface and an elastomeric reinforcement along a substantial length of the dynamic leg of the seal, from a low pressure end of the seal to an end spaced from the high pressure end of the seal.

Abstract: Disclosed herein is a fluid seal and rod wiper assembly suitable for insertion in annular groove of a piston housing packing chamber. The rod wiper assembly comprises a generally U-shaped elastomeric rod wiper having a thin lip which wipes a piston shaft and a thicker lip which provides a shoulder for accommodating an interference or compression fitting locking ring. An alternative embodiment includes a cantilever spring which is snap fit into the u-shaped compartment of the rod wiper. Another alternative embodiment includes an O-ring positioned within the u-shaped compartment defined by the rod wiper.