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Desalination Plant Valves
Specialized valves for SWRO, MSF, and MED desalination systems. Corrosion-resistant materials including NAB, 254 SMO, and Super Duplex for seawater intake, high-pressure RO, brine discharge, and product water applications.
Desalination Technologies Served
Clients: SWCC, DEWA, KAHRAMAA, Hyflux, IDE, Acciona, Veolia
Valves by Desalination Process Area
Recommended Materials for Seawater Service
NAB (ASTM B148 C95800)
Nickel Aluminium Bronze - excellent seawater resistance, proven track record in desalination. Ideal for intake, discharge, and general seawater service.
- Temperature: up to 260°C
- Excellent biofouling resistance
- Cost-effective for large valves
254 SMO (UNS S31254)
6% Mo super austenitic - superior pitting resistance (PREN >40). Ideal for warm seawater and chlorinated systems.
- PREN >40 (vs ~25 for 316L)
- Excellent for elevated temps
- Chlorine tolerant
Super Duplex 2507
Highest strength and corrosion resistance. Essential for high-pressure RO systems (55-70 bar).
- PREN >40
- High strength (yield >550 MPa)
- Ideal for HP pumps & RO feed
Valve Types for Desalination
Butterfly Valves
Large diameter isolation for intake and discharge. Double/triple offset for higher pressures. NAB or rubber-lined for seawater.
Ball Valves
High-pressure RO systems, isolation, and control. Trunnion mounted for large sizes. Super Duplex for HP service.
Check Valves
Pump protection, prevent backflow. Dual plate for compact installation. Swing check for low pressure drop.
Gate Valves
Full bore isolation with minimal pressure drop. Knife gate for slurry and debris-laden water.
Frequently Asked Questions
What valves are used in desalination plants?
Desalination plants use butterfly valves for seawater intake and large diameter isolation, ball valves for high-pressure RO systems, check valves for pump protection, gate valves for isolation, and control valves for flow regulation. Materials include NAB C95800, 254 SMO, Super Duplex 2507, and titanium.
What is the best material for seawater valves?
For seawater service: NAB C95800 for general seawater, 254 SMO for high chloride and elevated temperatures, Super Duplex 2507 for high pressure applications, and Titanium for the most aggressive conditions. Material selection depends on temperature, pressure, and chlorine content.
What pressure rating is needed for RO desalination valves?
SWRO high-pressure pump discharge and membrane feed valves typically operate at 55-70 bar (800-1000 PSI). This requires Class 600 or PN100 rated valves. Seawater intake valves operate at lower pressures (PN10-PN16) but require excellent corrosion resistance.
Do you supply valves to SWCC and DEWA projects?
Yes, we supply valves to desalination projects for SWCC (Saudi Arabia), DEWA (Dubai), KAHRAMAA (Qatar), and other major water authorities in the Middle East. Our valves meet the stringent material and testing requirements for these projects.
Need Valves for Your Desalination Project?
Send us your valve specifications. We provide material recommendations, technical support, and competitive quotations for SWRO, MSF, and MED projects.