TORSIONALLY LOADED FLUID SEALS FOR ROTARY VALVES

摘要

A fluid seal for rotary valves wherein a metal seal ring (26) is adapted to fit within a groove (28) formed within the valve body (12) and a retainer ring (24) for sealing engagement with the sealing surface of a closure member. The metal seal ring has a non-symmetrical cross section with the retainer ring side portion including a shoulder engaging the retainer within the groove and a seating portion extending from the groove for sealing engagement with the closure member. A valve body side portion of the metal seal ring includes a shoulder engaging the valve body within the groove and a non-seating portion extending from the groove for a substantially non-sealing non-engagement with the sealing surface of the closure member. Engagement of the closure member with the seating portion of the retainer side portion of the metal seal ring torsionally loads the cross section of the seal ring so as to only enlarge the retainer side portion. A resilient material seal ring can be added to the metal seal ring for desired applications.