Temperature responsive snapacting valve

Claim 1

A TEMPERATURE RESPONSIVE DEVICE COMPRISING A CASING, A VALVE BODY MOUNTED IN SAID CASING AND HAVING A FLUID FLOW PASSAGE EXTENDING THERETHROUGH FROM A FLUID INLET TO A FLUID OUTLET, CHECK VALVE MEANS IN SAID PASSAGE HAVING A VALVE SEAT FACING SAID INLET AND A VALVE MEMBER NORMALLY MAINTAINED IN A CLOSED POSITION AGAINST SAID SEAT BY FLUID PRESSURE AT SAID INLET, SAID VALVE MEMBER ING MOVABLE FROM SAID CLOSED POSITION TO AN OPEN POSITION SPACED FROM SAID SEAT TO OPEN SAID PASSAGE TO THE FLOW OF FLUID THERETHROUGH WITH THE FLUID PRESSURE SUBSTANTIALLY EQUALIZED ACROSS SAID VALVE MEMBER, FIRST SPRING MEANS IN SAID VALVE BODY BIASSING SAID VALVE MEMBER TOWARD VALVE SEAT, A PLUNGER SLIDEABLY MOUNTED IN SAID VALVE BODY AND OPERABLE UPON MOVEMENT IN A FIRST DIRECTION TO MOVE SAID VALVE MEMBER FROM SAID CLOSED POSITION TO SAID OPEN POSITION, A LEVER PIVOTALLY SUPPORTED AT ONE END ON SAID CASING, TEMPERATURE RESPONSIVE MEANS IN SAID CASING, MEANS COUPLING SAID TEMPERATURE REPONSIVE MEANS TO SAID LEVER AT A LOCATION INTERMEDIATE THE ENDS OF SAID LEVER FOR PIVOTING SAID LEVER RELATIVE TO SAID CASING IN RESPONSE TO VARIATIONS IN TEMPERATURE, SAID MEANS COUPLING SAID TEMPERATURE RESPONSIVE MEANS