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Check valve

  • US 4,223,697 A
  • Filed: 07/31/1978
  • Issued: 09/23/1980
  • Est. Priority Date: 07/31/1978
  • Status: Expired due to Term
First Claim
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1. In a check valve having a valve seat and a cooperating pivotally mounted clapper member, said clapper member having a closed surface area for contacting said valve seat, an improvement comprising:

  • a substantially V-shaped recess provided in the clapper member closed surface area and an O-ring disposed in said V-shaped recess the cross-sectional angle of said V-shaped recess being acute.

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