Fluid pressure actuator for valve

Claim 1

IN A VALVE ASSEMBLY HAVING A BODY, A FLUID PASSAGEWAY THEREIN, A RECIPROCABLE VALVE FOR SAID PASSAGEWAY FOR OPENING AND CLOSING THE SAME, A PRESSURE ACTUATOR CHAMBER IN SAID BODY, A PRESSURE ACTUATOR OPERABLE IN SAID ACTUATOR CHAMBER AND CONNECTED WITH SAID VALVE FOR ACTUATING SAME, SAID PRESSURE ACTUATOR COMPRISING A SHEET OF RESILIENT FLEXIBLE MATERIAL HAVING A GASKET PORTION SURROUNDING A CENTRALLY POSITIONED PRESSURE ACTUATOR PORTION CONNECTED TO SAID VALVE, SAID PRESSURE ACTUATOR PORTION HAVING AT LEAST ONE ANNULAR U-SHAPED IN CROSS SECTION PORTION POSITIONED IN THE PRESSURE ACTUATOR CHAMBER AND INTERMEDIATE THE SURROUNDING GASKET PORTION AND A CENTER DISC PORTION WHEREBY THE U-SHAPED IN CROSS SECTION ANNULAR PORTION PROVIDES A BIASING FORCE ON PRESSURE BEING APPLIED THERETO THAT DEFORMS THE SAME CAUSING THE PRESSURE ACTUATOR TO RESUME ITS NORMAL POSITION ON RELEASE OF ACTUATING PRESSURE APPLIED THERETO TO MOVE SAID VALVE, SAID BODY HAVING AN APERTURE AT THE BOTTOM OF SAID ACTUATOR CHAMBER TO RECEIVE AND GUIDE A STEM CONNECTING SAID VALVE AND THE PRESSURE ACTUATOR, A RIGID CENTRAL APERTURED DISC ATTACHED TO SAID VALVE STEM AND TO THE CENTER DISC PORTION OF THE FLEXIBLE AND RESILIENT PRESSURE ACTUATOR, A BOTTOM RIGID CENTRAL APERTURED DISC RECEIVED OVER SAID STEM AND ABUTTING ONE SIDE OF SAID PRESSURE ACTUATOR AND