Fluid sealing devices

Details Fluid sealing devices Fluid sealing devices

1980-09-22

1983-04-19

Smith, Robert I.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277177, F16J 1509

Patent

active

043803423

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. Thus any increase in pressure tends to wedge the sealing ring against the face of the back-up ring represented by the longer leg of the trapezoid so that extrusion of the elastomeric sealing ring and gross distortion of the elastomeric sealing ring are avoided.

REFERENCES:
patent: 2973978 (1961-03-01), Oppenheim
patent: 3765690 (1973-10-01), Sievenpiper
patent: 3817517 (1974-06-01), Lundquist
patent: 4143586 (1979-03-01), Zitting

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