Diaphragm Valve

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.
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Diaphragm Valve Specification

Click for more Diaphragm Valves - 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 options
Click for more 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

Common Materials of Construction Material Specifications
Standard Carbon Steel ASTM A105
A216 WCB
WCC
Low temperature Carbon Steel ASTM LF2
A352 LCC
LCB
Stainless Steel ASTM A182 F316
ASTM A182 F316L
ASTM A182 F304
ASTM A182 F304L
ASTM A182 F321
ASTM A182 F347
ASTM A351 CF8M
ASTM A351 CF3M
Specials F44
SMO
F51
Duplex
Super Duplex
Monel
Hastelloy
Titanium
Inconel
Bronze
Alu. Bronze
Other Actuated
Diaphragm Valve