Heat and pressure sensitive valve

Claim 1

A VALVE FOR VENTING GASES UPON OCCURRENCE OF PREDETERMINED TEMPERATURE AND PRESSURE CONDITIONS THEREIN COMPRISING A VERTICAL SEALED VALVE BODY, MEANS FOR INTRODUCING A GAS INTO SAID VALVE BODY, TEMPERATURE-SENSITIVE BIMETALLIC ELEMENTS VERTICALLY DISPOSED WITHIN SAID VALVE BODY, A FREE END OF SAID ELEMENTS ADAPTED FOR MOVEMENT IN RESPONSE TO TEMPERATURE VARIATIONS OF A GAS WITHIN SAID VALVE BODY, AN ORIFICE IN THE SIDE WALL OF SAID VALVE BODY JUXTAPOSED FROM SAID FREE END OF SAID ELEMENTS AND ADAPTED TO RECEIVE SAID FREE END TO PROVIDE A SEALING ENGAGEMENT THEREBETWEEN UPON THERMAL EXPANSION OF SAID ELEMENTS, A VERTICAL STACK SURROUNDING SAID VALVE BODY SECURED THERETO IN SEALING RELATION AT A POINT BELOW SAID ORIFICE, A CHIMNEY JOINED TO SAID STACK AND A CHECK VALVE IN SAID CHIMNEY, SAID CHECK VALVE COMPRISING A POROUS HORIZONTAL DISC SEALED WITHIN SAID CHIMNEY AND A LAYER OF MERCURY COVERTING SAID DISC, A FLOW OF GAS PASSING THROUGH SAID VALVE ONLY WHEN THE GAS IS AT A TEMPERATURE AFFECTING SID BIMETALLIC ELEMENTS SO AS TO OPEN SAID ORIFICE, AND WHEN THE GAS IS AT A PRESSURE SUFFICIENT FOR FLOW THROUGH SAID CHECK VALVE.