Patent ID: 7178555

Claim:
A pressure relief valve comprising: a self-supporting base mountable to a support surface and having a first layer defining an inner aperture; an inner rail member having a different configuration than said self-supporting base, wherein said inner rail member is positioned on the self-supporting base and connected by an adhesive layer to said self-supporting base: a flexible film connected with adhesive to the inner rail member, the flexible film being disposed on the periphery of the valve; said inner rail member defining a passageway between the flexible film and the base recessed from said inner aperture and in communication with said inner aperture; said flexible film moveable between an open and closed position; in said open position said flexible film is located above said aperture and extends outwardly beyond said base; and in said closed position, said film covers said aperture, the inner rail member has a sufficient thickness to permit said flexible film to move from said open position wherein said flexible film does not contact said self-supporting base and to said closed position wherein said flexible film does contact said self-supporting base.