Lined plug valve

Claim 1

A VALVE COMPRISING A BODY MEMBER, A ROTARY VALVING MEMBER AND A SEALING MEMBER, EACH OF SAID MEMBERS INCLUDING FLOW PASSAGES, MEANS MOUNTING SAID VALVING MEMBER FOR ROTATIONAL MOVEMENT AND SLIGHT LATERAL MOVEMENT RELATIVE TO SAID BODY AND SEALING MEMBERS TO PLACE THE FLOW PASSAGES OF SAID VALVING MEMBER IN AND OUT OF COMMUNICATION WITH THE FLOW PASSAGES OF SAID BODY AND SEALING MEMBERS, THE FLOW PASSAGES OF SAID BODY MEMBER INCLUDING AN AXIALLY EXTENDING CONTINUATION OF THE BODY MEMBER FORMING A CONTINUOUS, CIRCUMFERENTIAL LIP PROJECTING TOWARD SAID VALVING MEMBER AND TERMINATING IN A SEATING SURFACE FOR SAID VALVING MEMBER, SAID SEALING MEMBER COMPRISING A TEFLON SLEEVE ENCASING THE VALVING MEMBER AND INTERPOSED BETWEEN SAID VALVING MEMBER AND BODY MEMBER WITH THE FLOW PASSAGES OF SAID SLEEVE CIRCUMSCRIBING THE LIPS OF SAID BODY MEMBER, SAID SLEEVE SPACING THE VALVING MEMBER FROM AND MAINTAINING IT OUT OF CONTACT WITH THE SAID SEATING SURFACES OF THE LIPS OF SAID BODY MEMBER, SAID VALVING MEMBER BEING LATERALLY DISPLACED BY THE PRESSURE OF FLUID MEDIA BEING CONTROLLED, INCIDENT TO DISSIPATION OF SAID SEALING MEMBER, INTO CONTACTING RELATIONSHIP WITH THE SAID SEATING SURFACES OF THE LIPS OF THE BODY MEMEBER FOR PRECLUDING THE ACCIDENTAL PASSAGE OF FLUID MEDIA THROUGH THE VALVE WHEN THE SEALING MEMBER IS DISSIPATED WHILE THE FLOW PASSAGES OF THE VALVING MEMEBR ARE OUT OF COMMUNICATION WITH THE FLOW PASSAGES OF THE BODY MEMBER.