Combined shut-off and flow regulating valve

Claim 1

A COMBINED SHUT-OFF AND FLOW REGULATING VALVE ASSEMBLY FOR LIMITING MASS FLOW OF A PRESSURE FLUID TO A PREDETERMINED LEVEL, INCLUDING A VALVE BODY HAVING AN INLET PASSAGE AND AN OUTLET PASSAGE AND AN INTERCONNECTING INTERIOR CHAMBER, MOVABLE MEANS SLIDABLE IN SAID CHAMBER HAVING A PASSAGEWAY THERETHROUGH FOR RESTRICTED COMMUNICATION OF SAID INLET WITH SAID OUTLET, SPRING MEANS URGING SAID MOVABLE MEANS IN ONE DIRECTION IN SAID CHAMBER, AN ADJUSTABLE STOP MOUNTED IN SAID BODY TO LIMIT MOTION OF SAID MOVABLE MEANS IN SAID ONE DIRECTION, MEANS APPLYING THE PRESSURE DIFFERENCE BETWEEN SAID INLET AND SAID OUTLET TO SAID MOVABLE MEANS IN A DIRECTION OPPOSED TO SAID SPRING, SAID LAST NAMED MEANS INCLUDING A PASSAGEWAY EXTENDING FROM SAID INLET TO SAID MOVABLE MEANS IN NON-COMMUNICATING RELATION TO SAID OUTLET, TAPERING VALVE MEANS PROJECTING THROUGH SAID INLET PASSAGE INTO SAID CHAMBER AND ADAPTED TO ENTER SAID PASSAGEWAY TO CONTROL FLOW THERETHROUGH, SAID VALVE MEANS HAVING AN EXTENDED POSITION CLOSING SAID PASSAGEWAY IRRESPECTIVE OF MOVEMENT OF SAID MOVABLE MEANS AND FURTHER HAVING A RETRACTED POSITION OPENING SAID PASSAGEWAY, THE EFFECTIVE FLOW AREA OF SAID PASSAGEWAY IN THE RETRACTED POSITION OF SAID VALVE MEANS VARYING WITH MOVEMENT OF SAID MOVABLE MEANS, AND MEANS MOUNTED ON SAID BODY FOR SELECTIVELY ACTUATING SAID VALVE MEANS.