Lubricated Plug Valves operate in a similar way to Ball Valves but the closing member is a quarter-turn taper or  parallel plug. Tight shut-off is obtained by the lubricant that is injected onto the seating surface of the plug via a supply hole in the top of the valve stem. This can be applied at any time using a manual screw or a hand-operated pump.

Various special lubricants are available according to the service that the valve is handling and, because the seal is constantly renewable, 100% leak-tightness in both directions can be achieved over a long period in service.

A variety of materials and end connections are available in sizes up to 36" (900 mm) as well as multiport designs.
Lubricated Plug Valve
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