Flow control structure for use with pilot operated pressure reducing valve

Claim 1

FLOW CONTROL MEANS ADAPTED FOR USE WITH A PRESSURE CONTROLLING MAIN VALVE AND A PILOT VALVE CONTROLLING OPERATION OF THE MAIN VALVE; SAID FLOW CONTROL MEANS COMPRISING, MEANS PRESENTING A CYLINDRICAL CHAMBER, A MOVABLE FLOW CONTROL MEMBER IN SAID CHAMBER, AN OUTLET IN THE SIDE OF SAID CHAMBER, FLUID CONDUIT MEANS ENTIRELY PROVIDED BY A GROOVE IN THE PERIPHERY OF SAID MEMBER COOPERABLE WITH SAID OUTLET TO FORM A FLOW CONTROL ORIFICE, AN INLET, PASSAGE MEANS INCLUDING A FLOW RESTRICTOR FOR CONSTANTLY SUPPLYING FLUID INTO SAID CONDUIT MEANS IN SAID MEMBER FROM SAID INLET, A RESTRICTED PASSAGE CONSTANTLY COMMUNICATING BETWEEN SAID CONDUIT MEANS AND ONE END OF SAID CHAMBER, YIELDABLE MEANS URGING SAID MEMBER TOWARD A SECOND END OF SAID CHAMBER, AND PASSAGE MEANS INCLUDING A FLOW RESTRICTOR PROVIDING CONSTANT COMMUNICATION BETWEEN SAID INLET AND SAID SECOND END OF SAID CHAMBER.