Flow control valve

Claim 1

IN A FLOW CONTROL VALVE, A HOLLOW VALVE BODY HAVING AN INLET AT ONE END AND AN OUTLET AT THE OTHER, A TUBULAR THROTTLING MEMBER LONGITUDINALLY MOVABLE IN SAID BODY AND INCLUIDNG, AT THE INLET END OF SAID BODY, A PISTON WITH AN AXIAL CYLINDRICAL BORE THEREIN OPENING TOWARD SAID INLET END OF SAID VALVE BODY, INLET CAP MEANS INCLUDED IN SAID VALVE BODY FITTED INTO SAID BODY AT THE INLET END THEREOF AND HAVING A PORT THERETHROUGH WHICH CONSTITUTES SAID INLET OF SAID BODY, A CYLINDRICAL EXTENSION ON SAID CAP MEANS AROUND SAID PORT PROJECTING INSIDE SAID CYLINDRICAL BORE OF SAID PISTON AND HAVING BEARING AND SEALING ENGAGEMENT THEREWITH, A POPPET VALVE RECEIVED IN THE BASE OF SAID PISTON, CONFINED BY SAID CYLINDRICAL EXTENSION OF SAID CAP, THERE BEING A METERING ORIFICE THROUGH SAID POPPET VALVE, AND SAID POPPET VALVE AND THE FORWARD END OF SAID TUBULAR THROTTLING MEMBER BEING ADAPTED FOR SEATING INTERENGAGEMENT BY VIRTUE OF INFLOW OF HYDRAULIC FLUID THROUGH SAID INLET, SAID METERING ORIFICE COMMUNICATING WITH AN INTERIOR REGION OF SAID TUBULAR THROTTLING MEMBER IN SUCH POSITION, AND SAID POPPET VALVE BEING ADAPTED FOR UNSEATING MOVEMENT UPON REVERSE FLOW THROUGH THE VALVE, A SPRING URGING SAID THROTTLING MEMBER IN THE DIRECTION OF SAID INLET, THROTTLING PORT MEANS PROVIDING A PORT ARRANGED TO PASS FLUID BETWEEN SAID INTERIOR REGION OF SAID THROTTLING MEMBER AND SAID OUTLET, AND MEANS ON SAID THROTTLING MEMBER FOR VARYING THE EFFECTIVE SIZE OF SAID THROTTLING PORT IN RESPONSE TO LONGITUDINAL MOVEMENT OF SAID THROTTLING MEMBER.