Non-Lubricated Plug Valves

Non-lubricated valves do not employ lubrication as a means of protection. There are three sub-types of non-lubricated valves based on the design or material.

Elastomer Sleeved Non-Lubricated Plug Valve

Some non-lubricated plug valves use an elastomeric sleeve to protect plug valve components. This elastomeric sleeve should be non-metallic. This also acts as an additional sealant to the valve. The plug disc pushes against the sleeve to provide tight sealing.

However, because the elastomeric sleeve is non-metallic, this type of valve is not recommended for high-pressure applications. One such example of elastomeric material is Teflon.

Fully-Lined Non-Lubricated Plug Valve

Fully-lined plug valves have the plug disc and the body covered with an elastomeric material, often Teflon. Other valve manufacturing materials include perfluoroalkoxy copolymer resin (PFA) or tetrafluoroethylene (TFE).

Lining the valve fully makes it more resistant to corrosion. The valve itself is iron-made. This type of valve is very suitable for vacuum services

Lift Type Non-Lubricated Valve

This type of non-lubricated valve uses a spring or a lever that can mechanically lift the plug to unseal it from the valve seat. Other designs use line pressure to unseat the plug valve from the valve seat.

Specifications