English
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.
Diaphragm Valves Specification
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.
Diaphragm Valves Specification
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
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 |
