Safety valve means for protecting against the loss of fluid in a pressurizable fluid system

Claim 1

IN A PRESSURIZABLE FLUID SYSTEM, THE COMBINATION OF A CASING HAVING A CHAMBER THEREIN, A FLEXIBLE DIAPHRAGM IS SAID CASING DIVIDING SAID CHAMBER INTO A FLUID FLOW COMPARTMENT AND A COMPENSATING COMPARTMENT, SAID CASING HAVING A FLUID INLET PASSAGE AND A FLUID INTO SAID FLUID INLET PASSAGE AND A FLUID INTO SAID FLUID FLOW COMPARTMENT, A VALVE SEAT SURROUNDING SAID OUTLET PASSAGE AT THE INNER END THEREOF WITHIN SAID CASING, SAID DIAPHRAGM BEING POSITIONED OPPOSITE TO SAID SEAT AND NORMALLY SPACED THEREFROM AND MOVABLE AGAINST SAID SEAT TO CLOSE SAID OUTLET, MEANS DEFINING A RESTRICTED PASSAGEWAY CONNECTING SAID COMPENSATING COMPARTMENT TO SAID FLUID FLOW COMPARTMENT IN PROXIMITY TO SAID INLET PASSAGE, AND CHECK VALVE MEANS BY-PASSING SAID VALVE SEAT AND OPERATIVELY ALIGNED WITH SAID INLET PASSAGE TO DIRECT FLUID DIRECTLY INTO SAID INLET PASSAGEWAY WHEN THE PRESSURE DOWNSTREAM OF SAID SEAT EXCEEDS THE PRESSURE IN SAID FLUID FLOW COMPARTMENT.