Abstract: Disclosed is a sealing arrangement comprising two rings which preferably are complementary right trapezoids in cross-section. One ring is an elastomeric sealing ring. The other ring is a semi-rigid non-elastomeric back-up ring which is more rigid than the sealing ring. The rings are carried in a groove in one mating face of two members with mating faces which are movable with respect to each other. The sealing ring is arranged with the face represented by the shorter base of the trapezoid adjacent the member movable with respect to the member carrying the sealing ring and the back-up ring is arranged with the face thereof represented by the longer base of the trapezoid coplanar with the shorter base of the sealing ring. The elastomeric sealing ring is oriented so that it is nearer the area of higher fluid pressure.

Abstract: Disclosed is a sealing arrangement comprising two rings which are complementary right trapezoids in cross-section. One ring is an elastomeric sealing ring. The other ring is a semi-rigid non-elastomeric back-up ring which is more rigid than the sealing ring. The rings are carried in a groove in one mating face of two members with mating faces which are movable with respect to each other. The sealing ring is arranged with the face represented by the shorter base of the trapezoid adjacent the member movable with respect to the member carrying the sealing ring and the back-up ring is arranged with the face thereof represented by the longer base of the trapezoid coplanar with the shorter base of the sealing ring. The elastomeric sealing ring is oriented so that it is nearer the area of higher fluid pressure.