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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.