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Swing check seal assembly

  • US 3,870,071 A
  • Filed: 01/16/1974
  • Issued: 03/11/1975
  • Est. Priority Date: 01/16/1974
  • Status: Expired due to Term
First Claim
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1. In a swing check valve comprising:

  • a housing having a pair of flow passageways therein;

    a valve clapper in said housing;

    means pivotally mounting said clapper in said housing adjacent one of said flow passageways;

    an annular sealing surface on said clapper;

    a seat ring floatingly mounted in said body around said one passageway for limited axial and radial movement therein;

    a complementary surface on said seat ring engagable by the sealing surface of said clapper;

    a resilient seal ring carried on the leading surface of said seat ring;

    means associated with said seat ring for providing yieldable sealing forces between said seal ring and said sealing surface when engaged, said means providing a lesser sealing force at portions of said seat ring adjacent said pivotable mounting and a greater sealing force at portions of the seat ring displaced therefrom; and

    retainer means holding said seat ring on said body.

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