Ball valve

Claim 1

A VALVE COMPRISING, IN COMBINATION, BODY MEANS DEFINING A VALVE CHAMBER AND TWO PASSAGES EXTENDING THEREINTO A VALVE BALL ROTATABLY DISPOSED WITHIN SAID CHAMBER, VALVE SEATS EXTENDING AROUND THE INNER ENDS OF SAID RESPECTIVE PASSAGES AND SEALING AGAINST SAID VALVE BALL, A VALVE STEM EXTENDING ROTATABLY THROUGH SAID BODY MEANS INTO SAID CHAMBER AND BEING DRIVINGLY CONNECTED TO SAID BALL, SAID STEM BEING MOVABLE AXIALLY WITH RESPECT TO SAID BODY MEANS, SAID BODY MEANS INCLUDING MEANS ENCIRCLING SAID STEM ADJACENT SAID CHAMBER AND DEFINING WITH THE STEM A FIRST ANNULAR SEAL WELL ENCIRCLING THE STEM IN ADJACENT RELATION THERETO AND OPENING AXIALLY INWARD, AN INNER YIELDABLE SEAL OF ANNULAR FORM DISPOSED IN SAID FIRST WELL IN ENCIRCLING RELATION TO SAID STEM, A SEAL COMPRESSOR SUPPORTED ON SAID STEM INWARDLY OF SAID INNER SEAL AND BEING SHAPED TO EXTEND AXIALLY INTO SAID WELL IN CONFRONTING RELATION TO SAID INNER SEAL TO APPLY AXIAL FORCE THERETO, SAID BODY MEANS INCLUDING MEANS ENCRICLING SAID STEM TO DEFINE THEREWITH A SECOND ANNULAR SEAL WELL OPENING AXIALLY OUTWARD IN ENCIRCLING IMMEDIATELY ADJACENT RELATION TO SAID STEM,, AN OUTER YIEDABLE SEAL OF ANNULAR FORM DISPOSED IN SAID SECOND WELL IN ENCIRCLING RELATION TO SAID STEM, A COMPRESSING GLAND ELEMENT ENCIRCLING SAID STEM OUTWARDLY OF SAID OUTER SEAL AND BEING SHAPED TO EXTEND AXIALLY INTO SAID SECOND WELL TO APPLY INWARD COMPRESSING FORCE TO SAID OUTER SEAL, SAID GLAND ELEMENT BEING AXIALLY MOVABLE ON SAID STEM, TIGHTENING MEANS ON THE OUTER END OF SAID STEM REACTING ON SAID GLAND ELEMENT AND COACTING WITH SAID STEM TO FORCE THE STEM OUTWARDLY WITH RESPECT TO THE GLAND ELEMENT TO TRANSMIT AN OUTWARD SEAL TIGHTENING AXIAL FORCE THROUGH SAID STEM AND SAID SEAL COMPRESSOR TO SAID INNER SEAL AND TO APPLY AN INWARD SEAL TIGHTENING AXIAL FORCE THROUGH SAID GLAND ELEMENT TO SAID OUTER SEAL.