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Flow stabilized, retractable seal, double-block and bleed plug valve

  • US 5,385,332 A
  • Filed: 01/28/1994
  • Issued: 01/31/1995
  • Est. Priority Date: 01/28/1994
  • Status: Expired due to Fees
First Claim
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1. An improved plug for a plug-valve, the plug being rotatable about a rotation axis and having an exterior and an interior, the interior being formed by a flow passageway between opposing surfaces on the exterior to carry fluid through the plug when the plug is oriented in a valve body to align the flow passageway with the flow of the fluid into the valve, the plug blocking the fluid when the plug is oriented in a valve body to align the flow passageway substantially perpendicular to the flow of the fluid into the valve;

  • the improvement comprising;

    means in said flow passageway for altering the fluid pressure at a selected area therein;

    said fluid pressure altering means being positioned on a pair of diagonally opposite surfaces of said interior relative to said rotation axis to create a torque in response to fluid flow through said passageway.

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