A plug valve is a quarter-turn manual valve that uses a cylindrical or tapered plug to permit or prevent straight through flow through the body. The plug has a straight through full port opening. Plug valve can be used in on-off, basic moderate throttling, and diverting services.
The face-to-face standard for plug valves is normally associated with ANSI Standard B16.10. However, many manufacturers have elected to use face-to-face dimensions provided for gate valves so that plug valves can be used as a replacement for gate valve in existing process services.
Plug Valves Applications :-
- Plug valves are commonly used in low-pressure-low-temperature services, although some high-pressure-high-temperature designs also exists.
- Plug valves can efficiently handle gas and liquid fuel.
- Plug valves can be used to regulate the flow of liquids containing suspended solids, for example, slurries.
Advantages Of Plug Valves :-
- Plug valves have simple design with few parts.
- Plug valves open and close easily (except large dimensions).
- Plug valves have low flow resistance.
- Plug valves provide reliable leak-proofness.
Disadvantages Of Plug Valves:-
- Because of high friction, first movement (opening-closing) requires a large amount of force.
- NPS 4 (DN100) and larger plug valves require a gearbox or an actuator.
- Plug valve transitions are narrowing flows due to conic plug.
- Generally, plug valves costs are much larger than ball valves.