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Changeover valves with bypass and bent valving

  • US 3,935,108 A
  • Filed: 10/07/1974
  • Issued: 01/27/1976
  • Est. Priority Date: 10/07/1974
  • Status: Expired due to Term
First Claim
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1. Apparatus comprising:

  • a plug valve and first and second auxiliary valves mounted to said plug valve;

    said plug valve comprising a valve body having a chamber for receiving a valve plug and at least a first port and a second port communicating with said chamber, first and second openings in said valve body intersecting said first and second ports respectively, and a valve plug rotatably mounted in said chamber, said valve plug having a passageway for controlling flow of fluid through said valve body via said first and second ports;

    said auxiliary valves each comprising a stem having a stop portion which is disposed in one of said openings and is adapted to close off said one opening when said stem is in a first position and to open said one opening when said stem is in a second position, and means for moving said stem axially between said first and second positions; and

    means connecting said first and second openings so that fluid can bypass said valve plug when the stems of said bypass valves are in said second positions.

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