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Diaphragm valve

  • US 4,944,487 A
  • Filed: 05/08/1989
  • Issued: 07/31/1990
  • Est. Priority Date: 05/08/1989
  • Status: Expired due to Term
First Claim
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1. A diaphragm valve comprising:

  • A. valve body means defining a first flow passage, a second flow passage and a valve seat means between the first and second flow passages;

    B. diaphragm means comprised of an elastomeric material sealingly engageable with the valve seat means to prevent passage of fluid between the first and second flow passages;

    C. retractable means for releasably biasing the diaphragm means against the valve seat means to sealingly engage therewith and control the flow of fluid through the valve; and

    D. means for subjecting the diaphragm means to radial compression sufficient to cause the diaphragm means to disengage from the valve seat means when the biasing means is retracted.

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