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Check valve

  • US 4,958,661 A
  • Filed: 08/08/1989
  • Issued: 09/25/1990
  • Est. Priority Date: 08/08/1989
  • Status: Expired due to Term
First Claim
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1. A flow control valve comprising:

  • a. housing means having an inlet end and an outlet end and defining an axial flow passage therebetween comprising an inlet flow passage and an outlet flow passage and a central chamber of increased diameter intermediate between and communicating with both the inlet flow passage and the outlet flow passage;

    b. valve seat means comprising an annular ridge with a full radius rounded surface protruding toward the outlet end, concentric with and surrounding the opening through which the inlet flow passage communicates with the central chamber;

    c. A flexible disc comprised of an elastomeric material transversely positioned across the central chamber and releasably engageable with the valve seat means to prevent the flow of fluid media through the flow passage from the outlet end to the inlet end;

    d. means for prebiasing the disc against the valve seat means comprising a plurality of coaxial, angularly displaced tubular sectors with inside radii about equal to that of the outlet flow passage, forming a discontinuous annulus that surrounds and extends toward the inlet end from the opening of the outlet flow passage into the central chamber, wherein axially extending slots separate the sectors of the disc prebiasing means and define means for providing fluid communication between the outlet flow passage and the central chamber, and the disc prebiasing means further comprise shoulders that protrude radially outward from the disc prebiasing means for limiting the axially downstream and radially inward deformation of the disc; and

    e. support means for preventing the central portion of the disc from being forced into the inlet flow passage, the support means partially surrounding the opening of the inlet flow passage into the central chamber radially central to the valve seat means and protruding toward the outlet end of the valve.

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