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Valve and seal therefor

  • US 4,519,412 A
  • Filed: 06/01/1983
  • Issued: 05/28/1985
  • Est. Priority Date: 06/01/1983
  • Status: Expired due to Fees
First Claim
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1. A ball valve comprisinga body having a valve chamber therein with an opening and with a pair of opposed passages communicating with said chamber,a closure secured to said body and closing the opening into said chamber,a ball positioned in said chamber and having a passage extending therethrough,means for mounting the ball for rotation in said chamber to control flow through said body passages,a metal seat ring seat assembly for providing a seating surface for one side of the ball a first shoulder surface being defined within the valve body, a second shoulder surface being defined within the metal seat ring assembly so that when the metal seat assembly is inserted into the valve body an annular groove is defined by said shoulder surfaces,a single sealing assembly surrounding the opening of one of said body passages into said valve chamber and including a pair of pressure responsive dual resilient cup shaped sealing rings, said sealing rings each having an open end and a closed end, being responsive to line pressure at their open ends and facing in opposite directions within said annular groove for sealing between said ball and said one of said body passages independent of the direction of flow or pressure,a pair of metal seal rings disposed within a surface of the dual seal rings providing a metal-to-metal seal between the seat ring and the valve body on opposite sides of said annular groove, andsaid ball being spaced from the opening of the other body passage into said valve chamber.

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