Pressure operated regulating valve and control device

Claim 1

IN COMBINATION: A MAIN PRESSURE OPERATED VALVE HAVING A VALVE CLOSURE MEMBER NORMALLY BIASED TO A CLOSED POSITION AND OPERABLE IN RESPONSE TO FLUID PRESSURE IN A CONTROL CHAMBER; A CONTROL VALVE FOR CONTROLLING THE APPLICATION OF FLUID PRESSURE TO SAID CONTROL CHAMBER, SAID CONTROL VALVE INCLUDING A VALVE BODY HAVING A CHAMBER THEREIN, SAID CHAMBER HAVING A MOVABLE WALL, THE OUTSIDE OF SAID MOVABLE WALL BEING RESTRICTIVELY CONNECTED TO AN AREA OF LOW FLUID PRESSURE; A MAIN INLET PORT, A RESTRICTED INLET PORT AND AN OUTLET PORT IN SAID CHAMBER; MEANS ADAPTED TO CONNECT SAID INLET PORTS TO A SOURCE OF FLUID UNDER PRESSURE; MEANS CONNECTING SAID OUTLET PORT TO THE CONTROL CHAMBER OF SAID MAIN VALVE; VALVE MEANS IN SAID CHAMBER AND COOPERABLE WITH SAID MAIN INLET PORT TO PREVENT FLUID FLOW THERETHROUGH; YIELDABLE MEANS BETWEEN SAID MOVABLE WALL AND SAID VALVE MEANS AND URGING SAID VALVE MEANS TOWARD SAID MAIN INLET PORT; AND MEANS NORMALLY BIASING SAID MOVABLE WALL TO A POSITION WHEREIN SAID VALVE MEANS CLOSES SAID MAIN INLET PORT AND YIELDABLE IN RESPONSE TO FLUID PRESSURE IN SAID CHAMBER TO PERMIT MOVEMENT OF SAID MOVABLE WALL AND SAID VALVE MEANS TO OPEN SAID MAIN INLET PORT.