Device for sealing between preferably movable parts

Abstract

A device for producing a seal between movable and/or stationary parts, such as a piston and a cylinder particularly under conditions of high fluid pressures, comprises a sealing ring having an O-ring configuration and fabricated of a material such as rubber. A support ring is disposed on at least one side of the sealing ring in coaxial relation thereto, the support ring being fabricated of a thermoplastic polymer material having a hardness greater than the sealing ring and being formed with a concavely curved contact surface facing and engaging the sealing ring. A guide ring having an L-shaped cross section is disposed outside of the support ring relative to the sealing ring in coaxial relation to the sealing and support rings, and consists of a polymer material having a hardness greater than the thermoplastic polymer of the support ring. The guide ring includes a side surface in planar engagement with a planar contact surface formed on the support ring on the side thereof opposite to the concavely curved contact surface, the engaged planar surfaces having substantially the same dimensions in a radial direction, and the said guide ring also defines a peripheral sliding surface extending substantially perpendicular to its said side surface and having an axial dimension greater than the axial dimension of the support ring. The sealing ring, support ring, and guide ring are mutually displaceable relative to one another and have no mutual interconnections therebetween.