Diaphragm valve for venting fluid

Claim 1

A HERMETICALLY SEALED FLUID VALVE FOR AN ENCLOSURE OPENING COMPRISNG A RESILIENT SPRING-METAL DIAPHRAGM, A RIGID TERMINAL CAP HAVING ITS PERIPHERY IN CONTACT ENGAGEMENT WITH THE PERIPHERY OF SAID DIAPHRAGM AND ITS CENTRAL PORTIN SPACED APART FROM THE CENTRAL PORTIN OF SAID DIAPHRAGM TO PERMIT SAID DIAGPHRAGM TO BOW INTO THE SPACE THEREBETWEEN, SAID TERMINAL CAP HAVING AN APERTURE PROVIDED THEREIN TO PERMIT THE PASSAGE OF FLUID THEREGTHROUGH, A SEALING GASKET OF A SEALABLE MATERIAL DISPOSED IN SEALING ENGAGEMENT OVER THE EDGES OF BOTH SAID DIAPHRAGM AND SAID TERMINAL CAP, AND MEANS ASSOCIATED WITH SAID ENCLOSURE OPENING FOR SEALINGLY CLAMPING SAID GASKET RADIALLY AGAINST THE EDGES OF SAID DIAPHRAGM AND SAID TERMINAL CAP, THE ARRANGEMENT BEINGSUCH THAT SIAD OPENING IS CAUSED TO BE HERMETICALLY SEALED UNDER NORMAL CONDITIONS, AND WHEREBY A PRESSURE DIFFERENTIAL WHICH DEVELOPS BETWEEN THE TWO SIDES OF SAID DIAPHRAGM OF A PREDETERINED MAGNITUDE CAUSES SAID DIAPHRAGM TO BOW AND ITS EDGE TO RECEDE FROM SAID GASKET WHILE SAID GASKET IS RESTRAINED IN POSITION BY THE EDGE OF SAID TERMINAL CAP, THUS BREAKING THE SEAL AND PERMITTING FLUID TO FLOW BETWEEN SAID DIAPHRAGM AND SAID GASKET AND CAUSING SAID PRESSURE DIFFERENTIAL TO BE REDUCED, WHEREUP SAID SEAL IS RE-ESTABLISHED.