Gate Valves for Water Treatment & Desalination
Butterfly, gate, check, and diaphragm valves for water treatment, RO desalination, and municipal water distribution - DI, CS, SS 316 materials.
Which gate valves are used for water treatment & desalination?
Water treatment plants, reverse osmosis (RO) and multi-stage flash (MSF) desalination, and municipal water distribution systems require valves that provide low-maintenance service life, corrosion resistance to chlorinated and saline water, and compliance with drinking water safety standards. Ductile iron and stainless steel designs with EPDM or PTFE seals are the norm.
Resilient-Seated Gate Valve
Full-bore isolation in buried service, pumping stations, and distribution networks
Critical Requirements
- Drinking water contact compliance: WRAS / NSF 61 / IS potable water certification for epoxy coatings and elastomers
- Corrosion protection: fusion-bonded epoxy (FBE) or Rilsan (polyamide) coating for buried ductile iron valves
- EPDM elastomers - chlorine and ozone resistant for treated water service
- Large bore availability - DN 200–DN 1200 butterfly valves for major distribution mains
- Actuator compatibility for remote operation in WTP control systems
- Extended service life (20–40 years expected) - heavy-duty ductile iron construction
Service Challenges
- Chlorinated water (up to 5 ppm residual Cl₂) - EPDM seats, FBE-coated iron body required
- Seawater and brackish water (RO feed) - SS 316 or duplex for high chloride concentration
- Sludge and filter backwash - full-bore butterfly or diaphragm to prevent clogging
- Chemical dosing (alum, PAC, sodium hypochlorite, lime) - PP or PVDF-lined diaphragm valves
- Ozonated water - EPDM or PTFE seats; carbon steel and most rubbers deteriorate in ozone
Vajra Gate Valves
Robust gate valves for full-flow isolation and on-off service in various industrial systems.
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