Patent ID: 8074685

Claim:
A valve assembly comprising: a valve base having an air escape opening, said valve base comprising a seat that surrounds said air escape opening; a cap base coupled to said valve base, said cap base having an opening that at least partly overlies said air escape opening of said valve base; a flapper having a first portion held in place by said valve base and said cap base and a second portion that is not held in place by said valve base and said cap base; and a cap capable of being press-fit onto said cap base, said cap comprising a first portion that contacts a portion of said cap base when said cap is press-fit onto said cap base, a second portion that covers said air escape opening of said valve base when said cap is press-fit onto said cap base, and a third portion that maintains said second portion of said flapper in airtight sealing contact with said seat of said valve base along an entire perimeter of said seat when said cap is press-fit onto said cap base, wherein when said cap is not press-fit on said cap base, said second portion of said flapper is free to adopt a configuration whereby said second portion of said flapper is not in airtight sealing contact with said seat.