Diaphragm valves

The operation of a diaphragm valve is generally by a hand wheel device screwing down a stem with a saddle on the end, which in turn forces an elastomeric diaphragm on to a polished surface inside the valve body. Diaphragm valves can be either “weir” type or “full bore” type configurations. Energisation of the seal is purely by mechanical force, applied by the hand wheel through the screwed stem and saddle.

The primary function of a diaphragm valve is for isolation. Diaphragm valves are susceptible to erosion / flow damage and should therefore not be used for flow control or throttling applications.


General design criteria

  • Weir Type or Full Bore
  • Manual Handwheel Operated
  • 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

  • ANSI 800, 1500 & 2500lb – Threaded, Socket Weld and Butt-Weld ends
  • ANSI 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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