Rotary plug valve retaining means

Claim 1

IN A DEVICE OF THE CLASS DESCRIBED, A VALVE BODY HAVING A CONICAL OPENING THERETHROUGH AND PASSAGES COMMUNICATING WITH SAID CONICAL OPENING AT OPPOSITE SIDES THEREOF, A TAPERED VALVE ROTOR HAVING A TRANSVERSE PASSAGE EXTENDING THERETHROUGH, SAID ROTOR BEING RECEIVED IN SAID CONICAL OPENING AND BEING ROTATABLE THEREIN ABOUT ITS AXIS FROM A POSITION AT WHICH SAID TRANSVERSE PASSAGE REGISTERS WITH SAID PASSAGES IN SAID VALVE BODY TO A POSITION AT WHICH SAID PASSAGES IN SAID VALVE BODY ARE CLOSED BY SAID ROTOR, SAID ROTOR HAVING ITS SMALLER END PROJECTING BEYOND SAID VALVE BODY AND BEING PROVIDED WITH INTEGRAL MEANS FOR ENGAGEMENT WITH A ROTOR HOLDING DEVICE, AND A ROTOR HOLDING DEVICE ENGAGING WITH SAID INTEGRAL MEANS AND MADE UP OF AN INTERNALLY THREADED ELASTIC SLEEVE ENGAGING AGAINST SAID VALVE BODY AND AN EXTERNALLY THREADED ELASTIC SLEEVE TIGHTLY RECEIVED WITHIN SAID INTERNALLY THREADED SLEEVE AND ENGAGING AGAINST SAID INTEGAL MEANS, SAID SLEEVES BEING THREADEDLY ENGAGED ONE WITHIN THE OTHER AND COOPERATING TO HOLD SAID ROTOR AGAINST REMOVAL FROM SAID VALVE BODY, SAID ELASTIC SLEEVES BEING COMPOSED OF RESILIENT ELASTIC MATERIAL HAVING DEFORMABILITY AND SURFACE FRICTIONAL CHARACTERISTICS IN THE RANGE OF THOSE EXHIBITED BY ABRASIVE-FREE RUBBERS, POLYETHYLENES AND POLYFLUOROETHYLENES.