Ball valve improvement

Claim 1

A BALL-TYPE SAFETY VALVE, COMPRISING: A VALVE BODY PROVIDED WITH A BORE THERETHROUGH HAVING ALIGNED FIRST AND SECOND PORTIONS ON EITHER SIDE OF AN ENGLARGE DIAMETER PORTION, FIRST AND SECOND OPPOSITELY FACING AND SPACED APART TUBULAR VALVE SEAT MEMBERS RESPECTIVELY LONGITUDINALLY SLIDABLE IN SAID FIRST AND SECOND BORE PORTIONS AND HAVING A PART THEREOF PROJECTING INTO SAID ENLARGED DIAMETER BORE PORTION, A BALL-VALVE MEMBER HAVING AN OPENING THERETHROUGH AND SEATABLE BETWEEN SAID SEATS FOR OPENING AND CLOSING SAID BORE UPON THE ROTATION THEREOF ABOUT AN AXIS TRANSVERSE TO THE OPENING THERETHROUGH, INTERGENGAGING CAM SLOTS ON ONE AND CAM LUGS ON THE OTHER OF THE OPPOSITE SIDES OF SAID BALL-VALVE AND SAID VALVE BODY FOR CAUSING ROTATION OF SAID BALL-VALVE MEMBER TO CLOSED POSITION UPON LONGITUDINAL MOVEMENT THEREOF IN ONE DIRECTION IN SAID BORE AND TO OPEN POSITION UPON LONGITUDINAL MOVEMENT THEREOF IN THE OPPOSITE DIRECTION WITHIN SAID BORE, AN ANNULAR SLEEVE SURROUNDING THE SECOND VALVE SEAT MEMBER, SAID SLEEVE BEING FIXEDLY CONNECTED TO THE FIRST VALVE SEAT MEMBER FOR UNITARY LONGITUDINAL MOVEMENT THEREWITH, INTERENGAGING MEANS ON SAID SLEEVE AND SAID SECOND VALVE SEAT MEMBER CONSTRUCTED AND ARRANGED TO PROVIDE FOR SLIGHT MOVEMENT APART OF SAID VALVE SEAT MEMBERS, MEANS SLIDABLY SEALING SAID SLEEVE TO THE ENLARGE DIAMETER PORTION OF THE BORE OF SAID VALVE BODY AND TO SAID SECOND VALVE SEAT MEMBER AND SLIDABLY SEALING SAID SECOND VALVE SEAT MEMBER TO SAID SECOND BORE PORTION OF SAID VALVE BODY TO FORM A VARIABLE CAPACITY CHAMBER BOUNDED BY SAID VALVE BODY, SLEEVE AND SECOND VALVE SEAT MEMBER, MEANS FORMING A FLOW PASSAGE THROUGH SAID VALVE BODY INTO SAID CHAMBER.