Plug valves

Plug valves are very similar to ball valves, again quarter turn operation via manual hand lever or other actuating device. The seat to seal interface is created by the polished plug rotating within the valve body. It can be a straight plug, or a tapered plug depending on the performance required for the process conditions. Energisation is by mechanical force, which is built in to the valve at the assembly stage to the valve. Lubricated and lined plug valves also offer varying degrees of tight shut-off and operating torque requirements.

The primary function of a plug valve is isolation i.e. either fully open or fully closed and the secondary function can be reduction. This is achieved by tapering the valve bore and reducing the aperture in the through port in the middle of the plug.


General design criteria

  • Tapered or Parallel Plug Options
  • Manual Lever, Gear or Actuator Operated
  • Bolted or Welded Construction
  • Special Seat Design Options
  • Operating temperature and fluids suitability – further information on request
  • Firesafe / Cryogenic / Gas Service certified options
  • Modification service available for all stock option

Standard pressure class ratings / end connections

  • NSI 150, 300, 600, 800, 1500 & 2500lb – Flanged RF, RTJ, Butt-Weld and Hub ends
  • PN, API and other Pressure Class Valves available on request

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