Pressure safety device

Claim 1

A PRESSURE SAFETY DEVICE CONSISTING ESSENTIALLY OF A FRANGIBLE DIAPHRAGM WHICH IS CAPABLE OF RUPTURING WHEN SUBJECTED ON ONE SIDE TO A PREDETERMINED FLUID PRESSURE, HAVING A CENTRALLY DISPOSED RUPTURING PORTION, AN ANNULAR FLANGE PORTION AND A SKIRT PORTION AT THE PERIPHERY OF AND PERPENDICULAR TO THE FLANGE PORTION, A SOCKET MEMBER HAVING A FLUID PASSAGE, A PLUG MEMBER THREADINGLY ENGAGED WITHIN THE SOCKET AND PROVIDED WITH A FLUID PASSAGE IN REGISTER WITH THE FLUID PASSAGE IN THE SOCKET, SAID PLUG MEMBER AT ITS INNER END BEING PERIPHERALLY RECESSED TO PROVIDE A RESTRICTIVE GROOVE FOR RECEIVING THE SKIRT PORTION OF THE DIAPHRAGM, THE OUTER PERIPHERY OF SAID GROOVE BEING DEFINED BY THE OPPOSITELY DISPOSED PORTION OF SAID SOCKET, THE WIDTH OF SAID GROOVE BEING AT LEAST EQUAL TO THE THICKNESS BUT LESS THAN TWICE THE THICKNESS OF SAID SKIRT PORTION TO THEREBY PREVENT ACCIDENTAL INSERTION OF MORE THAN ONE DIAPHRAGM SKIRT INTO SAID GROOVE, SAID PLUG AND SOCKET MEMBERS CONJOINTLY PROVIDING MEANS FOR CLAMPING THEREBETWEEN THE FLANGE PORTION OF THE DIAPHRAGM IN A PLANE SUBSTANTIALLY NORMAL TO THE AXIS OF SAID FLUID PASSAGE WITH THE RUPTURING PORTION THEREOF EXTENDING ACROSS AND CLOSING SAID FLUID PASSAGE AND HOLDING SAID SKIRT PORTION IN SAID GROOVE.