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Backseat assembly for an expanding gate valve

  • US 5,435,520 A
  • Filed: 09/07/1994
  • Issued: 07/25/1995
  • Est. Priority Date: 09/07/1994
  • Status: Expired due to Term
First Claim
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1. A gate valve comprising:

  • a housing having a chamber with a flow passage therethrough and a stem-receiving bore transverse of said flow passage;

    an expanding gate member including first and second segments reciprocable in said housing transversely of said flow passage, said first and second segments having wedging surfaces causing said gate member to expand as said first segment travels axially away from said second segment;

    a stem member connectable at one end to said first segment and connectable at another end to a means for reciprocating said stem;

    said housing having an annular seat about said bore facing said chamber and a stop member for engaging said second segment;

    a sealing member slidingly disposed about said stem and supported by said first segment;

    a biasing member disposed between said first segment and said sealing member for biasing said sealing member away from said first segment;

    whereby upon said stop member engaging said second segment, said stop member limiting the travel of said second segment allowing continued travel of said first segment for said expanding gate member, said biasing member biasing said sealing member into sealing engagement with said annular seat to seal said stem with respect to said housing.

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