Ball Valves for Water & Wastewater

NSF/ANSI 61 — Drinking Water System Components (Health Effects) — is the US standard covering all products that contact potable water. For a ball valve to carry NSF 61 certification, every component in contact with the water must be evaluated and listed: body material, ball material, seat elastomers, stem packing, lubricants, and coatings. The certification is product-specific — a ball valve model listed under one manufacturer's NSF 61 certificate cannot be substituted with an uncertified equivalent. Verify certification by checking the NSF product listings database (info.nsf.org) — enter the manufacturer name and product model to confirm the specific size range and materials are certified. For UK installations, the equivalent is WRAS listing; for French municipal water, ACS (Attestation de Conformité Sanitaire) is required. Vajra provides NSF 61 certificates and product listing details for all water service ball valves on request.

Yes. Ductile iron (EN-GJS-400 or ASTM A536 Grade 65-45-12) ball valves are widely used for wastewater service with appropriate coating. Key requirements: (1) Internal coating — raw ductile iron corrodes rapidly in wastewater; specify fusion-bonded epoxy (FBE) coating to ISO 8179, or Rilsan polyamide 11 coating for aggressive wastewater; (2) External coating — epoxy or polyurethane external coating for buried service; (3) Seat material — EPDM for clean wastewater; NBR if light hydrocarbons present; (4) Full bore — wastewater carries solids and fibres that can jam reduced-bore valves or wear the seat at the bore constriction. For industrial effluent with pH <3 or >11, or with aggressive chemicals: stainless steel 316L is required — ductile iron cannot withstand strong acids or caustic even with coating. Vajra supplies ductile iron ball valves with FBE coating to EN 14901 specifically for wastewater service.

Vajra Industrial Solutions supplies NSF 61 approved ball valves from DN15 (1/2 inch) to DN600 (24 inch) for municipal water service. Up to DN100: standard two-piece full bore ball valves in stainless steel 316L or ductile iron with EPDM seats; these are typically direct-mount or flanged. DN100–DN300: flanged full bore ball valves in ductile iron or carbon steel with epoxy internal coating and EPDM seats; gear-operated for DN150+. DN300–DN600: large bore flanged ball valves with gear operator; split-body design for maintenance access; ductile iron with internal Rilsan or FBE coating. For sizes above DN600, consider butterfly valves (which offer better economy for large bore water service) or gate valves. Contact Vajra with your pressure rating (PN10, PN16, PN25) and installation type (above ground, buried) for a recommendation on the most economical NSF 61 approved design.