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Non-slamming check valve

  • US 6,443,182 B1
  • Filed: 11/08/2000
  • Issued: 09/03/2002
  • Est. Priority Date: 11/08/2000
  • Status: Expired due to Term
First Claim
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1. A check valve comprising:

  • a sealing device comprising a sealing plate, a guide shaft, and a dampening shaft, said guide shaft extending from a first surface of said sealing plate and said dampening shaft extending from a second surface of said sealing plate wherein said second surface is opposite said first surface;

    a guide plate adapted to be positioned within a fluid-carrying conduit, said guide plate having one or more through-passages for allowing a flow of fluid through said guide plate, and a guide aperture for guiding the reciprocating movement of said guide shaft;

    a valve plate adapted to be positioned within a fluid-carrying conduit, said valve plate having one or more through-passages for allowing a flow of fluid through said valve plate, and a seat surrounding said one or more through-passages in said valve plate and for contacting said second surface of said sealing device to prevent the flow of fluid through said one or more through-passages of said valve plate; and

    a dampening chamber for receiving said dampening shaft;

    wherein at least said dampening shaft includes a choke bore for allowing the escape of fluid from said dampening chamber, wherein said dampening shaft, said dampening chamber, and said choke bore are respectively dimensioned such that when said guide plate, said sealing device, said valve plate, and said dampening chamber are operably positioned within a fluid-carrying conduit, and said dampening shaft is forced into said dampening chamber, fluid within said dampening chamber becomes compressed and escapes said dampening chamber through said choke bore at a rate that is sufficiently slow to dampen the movement of said dampening shaft into said dampening chamber.

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