A plug valve with a body having an inlet and an outlet with a tapered rotatable plug between the inlet and the outlet.GLOBE VALVE The plug and valve body lined with a thermoplastic coating. Separate replaceable sealing valve seats are provided about the inlet and the outlet which can be replaced in the event that the seat becomes worn without the necessity of scrapping the valve body or plug. The seals including seating surfaces shaped to coact with the conical plug and spaced from the valve body and toward the valve plug whereby the plug will contact only the seals to provide a lower operating torque, better sealing,Safety valves and direct wear to the seals. Adjustable means are provided for holding the valve plug in a sealing relationship with the seals. The present invention is directed to an improved plastic lined plug valve in which the interior of the valve body including the inlet and outlet and the exterior of the rotatable conical valve element are coated with a thermoplastic coating. Plug Valves A replaceable plastic seal is provided between the valve body and the valve plug element between the plastic coatings thereon. The majority of the valve wear occurs on the valve seals which may be easily replaced without scrapping the valve body or valve plug element. A further object of the present invention is to provide for adjustable means for holding the valve plug element in a desired pressure sealing relationship with the seals which has the advantage that the tapered plug may be moved as wear occurs on the seals for spreading the wear on the valve plug over a wider area thereby lengthening the life of the plastic coating on the tapered plug element. Still a further object of the present invention is the provision of spacing the seating surfaces of the seals from the interior of the valve body and towards the valve element whereby the valve element will only contact the seals thereby preventing rubbing and wear between the coated surface on the tapered plug and the coated surface on the valve body, and providing a minimum seating area so that lower operating torque is required to rotate the plug valve, and in addition higher sealing pressures may be obtained between the tapered valve plug and the sealing seats.

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