Plug valve with removable insert and liner means

Claim 1

A PLUG VALVE COMPRISING A VALVE BODY HAVING AN INLET PASSAGEWAY, AN OUTLET PASSAGEWAY AND A TAPERED BORE TRANSVERSELY DISPOSED WITH RESPECT TO SAID PASSAGEWAYS, A TAPERED INSERT LOCATED IN SAID TAPERED BORE, SAID INSERT HAVING PASSAGEWAYS ALINGED WITH THE PASSAGESWAYS OF SAID VALVE BODY AND HAVING A CYLINDRICAL BORE, ACYLINDRICAL PLUG ROTATABLY MOUNTED IN SAID VALVE BODY AND HAVING A PASSAGEWAY THERETHROUGH ADAPTED TO BE SELECTIVELY TURNED INTO AN OPEN POSITION OR INTO A CLOSED POSITION WITH RESPECT TO THE PASSAGEWAYS IN THE VALVE BODY AND IN THE INSERT, AND A REINFORCED FLUOROCARBON PLASTIC LINER INTERPOSED BETWEEN SAID INSERT AND SAID PLUG, SAID LINER HAVING PASSAGEWAYS ALIGNED WITH THE PASSAGEWAYS OF SAID VALVE BODY AND A CYLINDRICAL BORE FORMING A BEARING SURFACE FOR SAID PLUG, SAID PLASTIC LINER BEING FILLED WITH FIBER REINFORCEMENT AND BEING FURTHER REINFORCED BY MEANS OF A PERFORATED METAL PLATE COMPLETELY EMBEDDED WITHIN SAID PLASTIC.