Lift plug operator

Claim 1

A ROTARY PLUG VALVE POSITIONABLE IN A PLURALITY OF POSITIONS COMPRISING: A HOUSING PROVIDED WITH AN OPEN ENDED TAPERED VALVE CHAMBER HAVING A NUMBER OF PORTS COMMUNICATING WITH SAID CHAMBER AND HAVING A GENERALLY CENTRALLY LOCATED BORE IN THE BOTTOM WALL OF THE VALVE CHAMBER; A ROTATABLE VALVE MEMBER POSITIONED IN THE VALVE CHAMBER, SAID VALVE MEMBER HAVING: A STEM JOURNALED IN THE CENTRALLY LOCATED BORE, A TAPERED SEGMENT CO-OPERABLE WITH THE WALL OF THE CHAMBER ADJACENT ONE OF THE PORTS TO SEAL SAID PORT, A STEM EXTENDING FROM THE SEGMENT THROUGH THE OPEN END OF THE VALVE CHAMBER, THE STEM HAVING A NUMBER OF LONGITUDINALLY EXTENDING SLOTS FORMED THEREIN DEFINING STOP SURFACES, SAID STEM HAVING ITS TERMINAL END REDUCED IN DIAMETER AND PROVIDED WITH THREADS AND HAVING SEGMENT POSITION INDICATING MEANS THEREON; A BONNET SEALINGLY SECURED TO THE HOUSING CLOSING THE OPEN END OF THE VALVE CHAMBER, SAID BONNET HAVING: A SEALED APERTURE FOR THE PASSAGE OF THE STEM, A STOP PIN ROTATABLY MOUNTED ON SAID CASING FOR SELECTING THE DIRECTION OF STEM ROTATION, SAID STOP PIN HAVING A NOSE PORTION SPRING BIASED TOWARD AND INTO COOPERATION WITH THE SLOTS IN THE STEM, THE NOSE PORTION HAVING A SURFACE THEREOF ADAPTED TO ENGAGE ONE OF SAID STOP SURFACES TO PROHIBIT STEM ROTATION IN ONE DIRECTION, AND A CAM PORTION WHICH PERMITS ROTATION OF THE STEM IN THE OPPOSITE DIRECTION, A HANDLE FOR ROTATING THE STOP PIN BETWEEN EACH OF PLURAL POSITIONS AND INDICIA ON EACH OF PLURAL SIDES FOR SHOWING THE POSITION OF THE NOSE OF THE PIN; A HANDWHEEL HAVING A THREADED HUB PORTION WHICH IS ENGAGED WITH THE THREADED END OF THE STEM WHEREBY WHEN ROTATION OF THE STEM IS PROHIBITED BY THE STOP PIN AXIAL MOVEMENT OF THE STEM OCCURS; A BEARING POSITIONABLE BETWEEN THE AXIAL OUTER END OF THE BONNET AND THE HUB PORTION; A BEARING RETAINER CAP SECURED TO THE BONNET AND HAVING A PORTION OVERLYING THE BEARING.