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VARIABLE BACK PRESSURE CHECK VALVE AND DRAIN VALVE

  • US 3,665,950 A
  • Filed: 07/13/1970
  • Issued: 05/30/1972
  • Est. Priority Date: 07/13/1970
  • Status: Expired due to Term
First Claim
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1. A variablE back pressure fluid flow check valve comprising:

  • a casing having an inlet connected to receive pressurized fluid at a variable flow rate and an outlet connected to a fluid receiver;

    check valve means operatively connected to said inlet and outlet for controlling the effective flow area therebetween and thus the fluid pressure drop therebetween;

    resilient means operatively connected to said valve means for imposing a predetermined force preload thereon tending to close the same in opposition to force derived from said pressurized fluid acting against said valve means;

    fluid flow responsive means operatively connected in series flow relationship with said inlet and outlet for generating a control fluid pressure which varies as a function of the fluid pressure drop between said inlet and outlet; and

    force producing means responsive to said control fluid pressure operatively connected to said valve means for imposing a force thereon to augment said resilient means.

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