High pressure seal assembly

Claim 1

A high pressure seal assembly for sealing parts guided for axial telescoping movement and/or rotation like a piston, a piston rod, a shaft and the like, comprising at least one seal ring of a material elastically or plastically deformable under pressure and having an axial annular groove which opens to an annular play to be sealed and is defined by a substantially radial annular surface and an axial annular web surrounding said annular groove on that side turned away from said annular play and a supporting ring positioned in said groove against said radial surface, said supporting ring being in the assembled state supported against an annular seal seat provided, said supporting ring being formed of a hard material substantially not deformed under the operating conditions and having a peripheral surface facing said annular play, said seal ring having a peripheral surface adapted to slidingly abut in operation against an opposed part, said peripheral surface of the supporting ring being slightly set radially back relative to said peripheral surface of said seal ring, and said supporting ring in an assembled position protruding radially beyond said seal seat with formation of a narrow annular play to said opposed part, said supporting ring having a peripheral surface turned away from said annular play and abutting against said annular web of the seal ring, said supporting ring in operating conditions being radially elastically displaceable in said annular web with limited deformation thereof.