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Air admittance valve assembly

  • US 6,415,816 B1
  • Filed: 08/31/2000
  • Issued: 07/09/2002
  • Est. Priority Date: 08/31/2000
  • Status: Expired due to Term
First Claim
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1. A one-way valve assembly for preventing the escape of gases from a system while permitting the venting of ambient air into the system under vacuum conditions, said valve assembly comprising:

  • a) a valve body having an upper portion and a bottom portion for connection to and communication with the closed system, said upper portion having at least one air inlet portion communicating with the ambient environment;

    b) a valve chamber positioned within said upper portion of said valve body, said valve chamber having a wall communicating with said at least one air inlet portion and said wall further having an upwardly extending valve seat forming a valve outlet portion between said valve seat and said valve body upper portion, said valve outlet portion being in communication with said valve body bottom portion;

    c) a flexible sealing membrane having a generally thin unsupported sealing area positioned for sealing under tension said valve seat of said valve chamber; and

    d) a cap structure connected to said upper portion of said valve body, said cap structure having alignment means for positioning said flexible sealing membrane for movement with respect to said valve seat of said valve chamber.

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