Valves for Water Treatment & Desalination

For water treatment in India, butterfly valves are specified per IS 13095 (Indian Standard for butterfly valves for water supply and sewerage), EN 593 (European standard), or AWWA C504. IS 13095 is the most common for domestic municipal projects. The valve body is typically ductile iron (GGG-50 per ISO 1083 or IS 1865) with EPDM seat. For export-oriented projects or international standards (World Bank, JICA-funded), EN 593 or AWWA C504 is specified.

RO desalination plants use several valve types: High-pressure butterfly valves or ball valves (in SS 316 or Duplex) for RO membrane train isolation; energy recovery devices (ERD) require high-cycle valves with precise control; brine reject lines use SS 316 due to high chloride concentration; pre-treatment (clarification, filtration) uses ductile iron butterfly valves. All valves in contact with potable water must comply with NSF 61 or equivalent.

Fusion-bonded epoxy (FBE) is a thermosetting powder coating applied to the internal and external surfaces of ductile iron valves (gate, butterfly, check) used in water service. FBE provides excellent corrosion protection against chlorinated water, brackish water, and soil corrosion in buried service. It is the standard protective coating for water distribution valves per AWWA C550. Thickness is typically 250–400 microns. NSF 61 / WRAS approved FBE coatings are required for potable water contact.

Yes. Vajra Industrial Solutions supplies ductile iron butterfly valves, resilient-seated gate valves, and swing check valves for rural water supply schemes (JJBY, Jal Jeevan Mission) and irrigation canals across India. IS standard valves are available with BIS certification. We supply to state water boards, PHEDs (Public Health Engineering Departments), and EPC contractors across Gujarat, Rajasthan, Maharashtra, MP, and other states.