Cast Iron Butterfly Valves
Cast iron butterfly valves control and isolate flow with a disc that rotates a quarter turn inside a short, light body. They are the most economical valve for large-diameter water and HVAC lines.
We supply wafer, lug and double-flanged butterfly valves with cast iron or ductile iron bodies, EPDM or NBR liners and stainless steel or ductile iron discs.
Specifications
| Product name | Cast Iron Butterfly Valve |
|---|---|
| Valve type / design | Concentric, resilient seated; wafer, lug or double flanged; lever, gear or actuated |
| Body material | Ductile iron EN-GJS-400 / cast iron EN-GJL-250 body; ductile iron, SS304/SS316 or aluminium-bronze disc; EPDM / NBR liner |
| Size range | 2" to 48" (DN50 – DN1200) |
| Pressure rating | PN10 / PN16; ASME Class 150 |
| End connections | Wafer, lug, double flanged (EN 1092 / ASME B16.5) |
| Standards | BS EN 593, API 609 Category A, MSS SP-67, ISO 5211 |
| Applications | Water, wastewater, HVAC, fire protection and cooling water |
Industrial uses
- Water & wastewaterIsolation and control on large-diameter treatment plant lines.
- HVACChiller, cooling tower and pump isolation.
- Cooling waterPower plant and industrial cooling circuits.
- Fire protectionGear-operated valves on fire water mains.
- IrrigationLarge-bore distribution and pump station valves.
- DesalinationSeawater service with coated body and bronze or duplex disc.
Frequently asked questions
What is the difference between wafer and lug butterfly valves?
A wafer valve is clamped between two flanges by through-bolts. A lug valve has threaded lugs, so one side of the pipe can be removed while the valve still holds pressure (dead-end service).
EPDM or NBR liner?
EPDM suits water, drinking water and mild chemicals. NBR suits oils, fuels and hydrocarbons. Tell us the fluid and temperature and we'll recommend the liner.
Can a butterfly valve throttle flow?
Yes, roughly between 20% and 80% open. For fine control over a wide range, a globe valve or control valve is better.
When should I use a gearbox instead of a lever?
Levers suit smaller sizes. From around DN200 upward, or where slow closing is needed to avoid water hammer, use a gearbox.