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Check valve with elastomeric valve element

  • US 3,889,710 A
  • Filed: 01/11/1974
  • Issued: 06/17/1975
  • Est. Priority Date: 11/07/1972
  • Status: Expired due to Term
First Claim
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1. A check valve comprising:

  • a housing defining a chamber having first and second opposing ends, an inlet passage having an opening entering the chamber through one of said opposing ends and an outlet passage having an opening entering the chamber through the other of said opposing ends, an annular portion of said one end of the chamber immediately surrounding the inlet passage opening forming an annular concave valve seat, an abutment means in the chamber, fluid openings being provided through the abutment means to permit fluid to flow from the inlet passage therethrough to the outlet passage, one end of the abutment means projecting towards the inlet opening, a resilient disc which is essentially flat in its relaxed condition extending transversely across the chamber between the said one end of the abutment means and the annular valve seat, said disc being of a sufficiently large cross-section, taken in the direction transverse to the flow direction, that in its normal closed condition in the chamber, the said one end of the abutment means engages the central portion of the disc on the side thereof facing the outlet opening and flexes the disc convexly toward the inlet opening as the outer periphery of the disc sealingly engages the annular valve seat, said fluid openings in the abutment means positioned to remain open for fluid flow from the inlet opening around the outer periphery of the disc and through the fluid openings to the outlet opening when the resilient disc has flexed toward the outlet opening as far as its outer dimensions and resilience allow when subjected to the largest possible pressure differential from the inlet opening toward the outlet opening, said resilient disc having sufficient resiliency and arranged to increase the area of its sealing contact with the annular concave valve seat from said initial sealingly engaging outer periphery, radially inwardly, as the fluid forces from the outlet toward the inlet increase beyond the flexing force exerted by the abutment means on the disc, and the outer periphery of the disc, when in the said normal closed position, being spaced radially inwardly from the outer periphery of the concave valve seat, permitting at least slight transverse movement of the disc within the chamber when sealingly engaging the annular valve seat.

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