Gas pressure warning valve

Claim 1

A GAS PRESSURE RESPONSIVE DEVICE COMPRISING: (1) A HOLLOW AXIALLY SYMMETRICAL VALVE BODY SAID VALVE BODY HAVING A THREADED INLET FOR CONNECTION WITH A SOURCE OF GAS PRESSURE TO BE SUPERVISED AT ONE END AND AN OUTLET AT THE OTHER END; (2) A RESILIENT AXIALLY EXTENSIBLE CHAMBER ANCHORED WITHIN SAID VALVE BODY AND HAVING A FIRST OPENING JUXTAPOSED SAID VALVE BODY INLET, THE INTERIOR OF SAID EXTENSIBLE CHAMBER CONNECTED TO MEANS COMMUNICATING PNUEMATICALLY WITH SAID VALVE BODY INLET, AND HAVING A SECOND OPENING TO SAID VALVE BODY OUTLET; (3) SAID RESILIENT CHAMBER COMPRISING: A RADIAL WALL AND AN AXIALLY DEFLECTABLE PERFORATED END WALL REMOTE FROM THE INLET, SAID PERFORATE END WALL BEING REINFORCED BY AN INTEGRAL RIGID PERFORATE MEMBER HAVING PERFORATION IN REGISTER WITH THE PERFORATION OF SAID CHAMBER END WALL TO FORM A GAS PASSAGE THERETHROUGH AND TO RESTRICT ELASTIC DEFORMATION OF SAID END WALL UNDER GAS PRESSURE CHANGE; (4) A PLUG MEMBER CONNECTED TO THE OUTLET OF SAID VALVE BODY, SAID PLUG MEMBER SUPPORTING A RIGID VALVE SEAT PROJECTING INTO SAID VALVE BODY IN AXIAL ALIGNMENT WITH SAID PERFORATION IN SAID END WALL OF SAID RESILIENT CHAMBER, SAID VALVE SEAT BEING OF LARGER DIAMETER THAN SAID PERFORATION AND BEING SHAPED TO ENGAGE AND FORM A GAS TIGHT SEAL THEREAGAINST WHEN SAID PERFORATION MOVES AXIALLY AGAINST SAID SEAT BY AXIAL EXTENSION OF THE RADIAL WALL OF SAID RESILIENT CHAMBER; AND (5) A GAS PRESSURE RESPONSIVE SIGNAL DEVICE CONNECTED TO THE OUTLET OF SAID VALVE BODY.