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PLUG VALVE

Br. Christens Plug Valve

A quarter turn valve, having a plug which can be turned to move its ports relative to the body seat ports to control the flow of fluid. The closure element is usually a tapered plug having a rectangular port.

Plug valves may take the following forms:

(i) Non-lubricated plug valve which can incorporate mechanical design feat-ures to reduce friction between the piug face and body seat ports.

(ii) Lubricated plug valve which in-corporates design features whereby lubricant can be injected under pres-sure to reduce friction between the plug face and body seat ports.

TYPES OF PLUG VALVES

Conical plug       

A plug valve in which the plug is conical.

Cylindrical plug

A plug valve in which the plug is cylindrical.