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COMBINATION SHUT-OFF VALVE AND FLOW CONTROL VALVE WITH SIDE ACCESS AND VIEWING PORT FOR OBSERVATION, TESTING AND ON-LINE SERVICING

  • US 3,854,497 A
  • Filed: 07/01/1971
  • Issued: 12/17/1974
  • Est. Priority Date: 07/01/1971
  • Status: Expired due to Term
First Claim
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1. Combination shut-off valve and flow-control valve with side access and viewing port for observation and on-line servicing comprising a valve casing having an inlet passage and an outlet passage, a rotatable valve member positioned in said casing between said inlet and outlet passages, said valve member being capable of being turned into different angular positions including a flow-control operating position and shut-off position, said valve member having a bore extending therethrough for permitting liquid flow to occur between said inlet and outlet passages when said valve member is turned into its flow-control position in which said bore communicates with both said inlet and outlet passages, flow-control means in said bore for controlling the liquid flow through said bore, said valve member shutting off both said inlet and outlet passages when said valve member is turned into its shut-off position in which said bore is angularly displaced away from said inlet and outlet passages, said casing having a side access port therein providing access to said valve member, openable closure means normally closing said side access port and capable of being opened for permitting access through said port to said valve member, a window in said valve member permitting observation of said flow-control means in said bore, said window being positioned in alignment with said access port when said valve member is turned into its flow-control position for providing visual inspection of said flow-control means through said side access port while said combination valve remains on-line in flow-control operation, and said bore being positioned in alignment with said side access port when said valve member is turned into its shut-off position for providing access to said flow-control means through said side access port for servicing said flow-control means while said combination valve remains on-line in its shut-off position, said flow-control means in said bore including plunger means movable downstream in said bore, spring means urging said plunger means in an upstream direction, and said plunger means including visible characteristics on its side such as scribed lines, graduations, side openings or the like which are observable through said window for visually determining the operating position of said plunger means.

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