Swivel ring valve

Claim 1

A CONTROL VALVE COMPRISING A HOUSING HAVING A FLUID FLOW PASSAGE THERETHROUGH DEFINING A SURFACE OF REVOLUTION DEFINING A VALVE PORT WITH A TAPERING VALVE SEAT FACING THE INLET END OF THE PASSAGE, SAID PASSAGE INCLUDING A LARGE CYLINDRICAL INLET PORTION BETWEEN SAID INLET END AND SAID VALVE SEAT, A CYLINDRICAL OUTLET PORTION OF A DIAMETER THE SAME AS THE OUTLET OF SAID VALVE SEAT, AND A TERMINAL BORE PORTION HAVING A CYLINDRICAL SEALING SURFACE AND A THREADED PORTION, A VALVE STEM EXTENDING THROUGH SAID VALVE PORT HAVING A HEAD PORTION WITHIN SAID LARGE CYLINDRICAL INLET PORTION AND A THREADED PORTION ROTATABLY ENGAGING THE FIRST MENTIONED THREADED PORTION FOR RELATIVE AXIAL MOVEMENT AND A STEM PORTION RECEIVED WITHIN SAID SEALING SURFACE HAVING AN ANNULAR GROOVE THEREIN, A RING SEAL IN SAID GROOVE SLIDABLY ENGAGING SAID SEALING SURFACE, SAID STEM AND RING SEAL BEING RECEIVED INTO PLACE IN SAID PASSAGE SOLELY THROUGH SAID INLET END, AN OUTLET CONDUIT MEANS OPENING INTO SAID CYLINDRICAL OUTLET PORTION ADJACENT TO SAID VALVE SEAT, A CONNECTING PASSAGE IN SAID HOUSING HAVING AN OPENING INTO SAID LARGE CYLINDRICAL INLET PORTION ADJACENT TO SAID VALVE SEAT AT A POINT OPPOSITE SAID VALVE STEM HEAD PORTION, SAID VALVE STEM HEAD PORTION HAVING OPPOSITELY TAPERING SURFACES ON THE INLET AND OUTLET SIDES THEREOF DEFINING THEREBETWEEN ONE WALL OF AN ANNULAR VENTURI THROAT IN CONJUNCTION WITH SAID VALVE SEAT AND SAID LARGE CYLINDRICAL INLET PORTION, SAID OUTLET TAPERING SURFACE HAVING A CIRCUMFERENTIAL GROOVE WITH SPACED SIDE WALLS DIVERGING RADIALLY OUTWARDLY WITH THE SIDE WALL REMOTE FROM THE VALVE SEAT THE WIDEST BEING ESSENTIALLY NORMAL TO THE AXES OF THE VALVE STEM, A SEALING RING SWIVELLY MOUNTED IN THE GROOVE, SAID SEALING RING COMPRISING A FLEXIBLE, RESILIENT PLASTIC OF LOW CO-EFFICIENT OF FRICTION HAVING AN AXIAL CONTOURED SEALING SURFACE WHICH ROTATABLY MATES WITH SAID WIDEST WALL OF SAID GROOVE IN SEALING RELATIONSHIP WHEN CLOSED AND A TAPERING SURFACE OF REVOLUTION MATING WITH THE TAPER OF THE VALVE SEAT IN NON-ROTATTING, LEAK-PROOF SEALING RELATIONSHIP BETWEEN THE INLET AND OUTLET PORTS UNDER VALVE CLOSING PRESSURES, SAID VALVE HEAD AND SEALING ELEMENT BEING DISPOSED WITHIN SAID VALVE SEAT TAPER TO FORM THEREWITH AND WITH SAID LARGE CYLINDRICAL INLET PORTION A VENTURI PASSAGE WHEN SAID SEALING ELEMENT IS AWAY FROM SAID CONTACT, SAID VALVE STEM HEAD PORTION EXTENDING BEYOND SAID CONNECTING PASSSAGE OPENING WHEN THE SEALING ELEMENT IS FULLY OPEN.