Cast Iron Check / Non-Return Valves
Cast iron check valves, also called non-return valves, let fluid flow in one direction and close automatically when the flow stops or reverses. They protect pumps, prevent backflow and stop pipelines draining down.
We supply swing check, dual plate (wafer) and ball check valves in cast iron and ductile iron for water, wastewater and HVAC systems.
Specifications
| Product name | Cast Iron Check / Non-Return Valve |
|---|---|
| Valve type / design | Swing check (bolted cover), dual plate wafer check, or ball check |
| Body material | Grey cast iron ASTM A126 Class B / EN-GJL-250; ductile iron EN-GJS-400; bronze, SS or rubber-faced disc |
| Size range | 2" to 24" (DN50 – DN600) |
| Pressure rating | PN10 / PN16; ASME Class 125 |
| End connections | Flanged; wafer (dual plate) |
| Standards | MSS SP-71, BS EN 12334, API 594 (dual plate), API 598 testing |
| Applications | Pump discharge, water supply, wastewater, HVAC and fire lines |
Industrial uses
- Pump dischargeStopping reverse flow and reverse rotation when the pump stops.
- Water supplyPreventing mains and rising lines from draining back.
- WastewaterBall check valves for sewage and solids-laden flow.
- HVACDual plate checks on chilled and condenser water pumps.
- Fire protectionNon-return duty on fire pump and jockey pump lines.
Frequently asked questions
What is the difference between a swing check and a dual plate check valve?
A swing check uses a single hinged disc inside a flanged body. A dual plate check uses two spring-loaded half discs in a slim wafer body, which is lighter, shorter and closes faster, reducing water hammer.
Which check valve is best for sewage?
A ball check valve. It has a clear flow path with no hinge or spring in the fluid, so solids and rags are less likely to jam it.
Can check valves be installed vertically?
Many can in upward flow, but not all. Swing check valves need to be approved for vertical service. Dual plate and ball check valves generally suit vertical upward flow. Tell us the orientation when ordering.