Plug valve

Claim 1

IN A SANITARY PLUG VALVE HAVING A MAIN BODY WITH A FRUSTUM-SHAPED SEAT THEREIN AND A FLOW PASSAGE EXTENDING THROUGH SAID BODY TRANSVERSELY TO SAID SEAT, A VALVE PLUG ADAPTED TO BE TURNABLE IN SAID SEAT, SAID PLUG COMPRISING A HOLLOW CORE OF RIGID, STRONG MATERIAL, SAID CORE INCLUDING PARALLEL SPACED APART END WALLS JOINED BY A THIN SIDE WALL THE GENERAL EXTERIOR CONFIGURATION OF WHICH IS SUBSTANTIALLY THE SAME AS THE PLUG, A SHOULDER EXTENDING FROM EACH OF SAID END WALLS, RUBBER-LIKE MATERIAL COVERING AND FILLING SAID CORE AND EXTENDING OVER EACH END WALL AND SURROUNDING EACH OF SAID SHOULDERS, A HANDLE FOR TURNING SAID PLUG SECURED TO ONE OF SAID SHOULDERS, AND PLUG RETAINING MEANS COMBINED WITH THE OTHER SHOULDER, SAID PLUG HAVING A PASSAGEWAY ADAPTED TO REGISTER WITH THE FLOW PASSAGE IN SAID VALVE BODY WHEN SAID PLUG IS TURNED TO THE OPEN POSITION, THE PASSAGEWAY EXTENDINBG COMPLETELY THROUGH ONE SIDE OF THE PLUG AND DEFINED ON ONE SIDE BY THE VALVE BODY AND ON THE OPPOSITE SIDE BY A CENTRAL STRAIGHT PORTION WITH DIVERGING SIDE POTRIONS WHEREBY SAID PLUG CAN BE USED IN BOTH TWO-WAY AND THREE-WAY VALVE BODIES.