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Gate valve

  • US 4,771,805 A
  • Filed: 11/16/1983
  • Issued: 09/20/1988
  • Est. Priority Date: 12/30/1982
  • Status: Expired due to Fees
First Claim
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1. A gate valve having a valve body with a cavity open at one end and closed at the other end, a bonnet secured over and effectively closing said one end, a seat carrier contained within said cavity with said carrier and the cavity having complementary conically disposed walls, an aligned passageway extending through the body and the seat carrier and intersecting said conical walls, a gate carried by the seat carrier sealingly cooperating therewith, and movable between an open and a closed position with respect to said passageway, metallic seal means carried by the seat carrier and disposed about the opening at each end of the passageway in the seat carrier, said seal means being forced into sealing engagement with the conical wall of said cavity to form a metal-to-metal seal therewith upon forcing the seat carrier into position in said cavity while maintaining said conically disposed walls in spaced relation, said seat carrier being thus forced into position in response to the bonnet being secured over the open end of the cavity in said valve body, said bonnet, gate, seat carrier and seal means being effectively interconnected so that they are installed in and removed from the valve body as a unit.

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