Non-Return (NRV) Valves
Swing, dual-plate and silent disc-lift check valves to prevent reverse flow.
Technical data sheet
Non-Return Valve (NRV) — Swing / Dual-Plate / Disc Type
Non-return (check) valves engineered to prevent reverse flow in pump discharge, water mains, fire systems, and process lines. Swing, dual-plate (wafer), disc-lift (silent), and ball-check configurations.
Characteristics
| Nominal size (DN) | mm | 15 to 600 |
|---|---|---|
| inch | ½ to 24 | |
| Pressure rating | — | PN10 / PN16 / PN25 / PN40 / ANSI 150 / ANSI 300 |
| Body | — | Cast iron / Ductile iron / Cast steel / Bronze / SS |
| Disc | — | DI / SS 304 / SS 316 / Bronze |
| Type | — | Swing / Dual-plate (wafer) / Silent disc-lift / Ball-check |
| End connection | — | Flanged / Threaded / Wafer / Lug |
| Temperature | °C | -10 to +180 (metal-seated); -10 to +120 (resilient) |
| Mounting | — | Horizontal & vertical (upflow); orientation per type |
| Standards | — | IS 5312 / API 6D / EN 12334 / AWWA C508 |
| Applications | Use | Pump discharge, Fire mains, Booster systems, Water mains, HVAC, Process, Steam |
Material of Construction — Swing check valve
- Body: Cast iron / Ductile iron / Cast steel
- Disc: Cast iron / SS 304 / SS 316, EPDM/NBR-faced (optional)
- Disc hinge: Stainless steel pin & bracket
- Seat ring: Bronze / SS — replaceable
- Body cover: Bolted, with gasket (CAF / spiral wound)
Material of Construction — Dual-plate / silent check
- Body: Cast iron / Ductile iron / Cast steel / SS
- Plates / disc: Stainless steel SS 304 / SS 316, dynamically balanced
- Spring: Stainless steel SS 316 — fatigue resistant
- Seat: EPDM / NBR / Viton (resilient) / metal-seated (high-temp)
- Hinge / stop pins: Stainless steel
- Body design: Wafer / lug — compact face-to-face per API 594
Salient Features
- Swing type — large port, low pressure drop, ideal for water mains
- Dual-plate (wafer) — compact, lightweight, fast closure
- Silent disc-lift — low water hammer, ideal for pump discharge
- Spring-assisted closure (silent / dual-plate) — works at low velocity
- Resilient (rubber) seat for bubble-tight closure (water service)
- Metal-to-metal seat for steam / high-temperature service
- Replaceable seat & wear parts (where serviceable)
- Compact wafer dimensions (per API 594 / EN 558)
- Conforms to IS 5312 / API 6D / EN 12334
- Suitable for horizontal or vertical (upflow) installation per type
Applications
- Pump discharge — prevent reverse flow & water hammer
- Fire-fighting mains (UL/FM listed variants)
- Pressure booster pump system delivery
- Municipal water supply mains
- HVAC chilled water systems
- Industrial process piping
- Steam & condensate lines (metal-seated)
- Sewage & wastewater (dual-plate variant)
For pump discharge service with potential water hammer, prefer silent disc-lift or dual-plate spring-assisted variants.
Install with arrow on body pointing in direction of flow; ensure adequate straight pipe (5×D) upstream.
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All configurations & variants
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Non-Return (NRV) Valves for India, UAE, Saudi Arabia & Export Markets
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