Gate valve

  • US 5,890,700 A
  • Filed: 07/29/1997
  • Issued: 04/06/1999
  • Est. Priority Date: 07/29/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A gate valve assembly comprising two body housing members having coaxial through passages and being secured together in end to end relation;

  • each of said passages being defined by a housing plate, with means to define a relatively narrow transverse gate chamber, in which a gate member is slidable between a valve open position in which the gate does not block fluid flow through the passages, and a closed position in which the gate is interposed between the passages, a unitary annular primary sealing sleeve unit lining each of said passages and extending the length of each passage whereby each primary sleeve unit has an inner end extending into the chamber and an outer end at a passage end remote from the chamber, and with each of the primary sleeve units having an axially inner end portion extending into the chamber and adapted to sealingly engage each other or the gate under compression in the open position of the valve, and with the gate between the primary sleeve axially inner end portions when the valve is closed, each of the primary sleeve units being in the form of an axially deformable annular body of elastomeric material, and with a secondary sealing unit secured between said housing members above the primary sleeve units, said secondary sealing unit being in the form of a unitary deformable body of elastomeric material having an interior passage which aligns with said gate chamber, said secondary sealing unit further having an inner peripheral edge extending into said interior passage adapted to sealingly engage the gate, said inner peripheral edge being provided with alternating ribs and grooves such that said ribs sealingly engage the gate and said grooves are capable of retaining lubrication to promote cohesive sliding of said gate during opening and closing cycles.

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