How to find the right Butterfly Valves AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Butterfly Valves
- Body style
- Wafer between flanges for simple isolation. Lug style when the valve must hold pressure as an end-of-line or dead-end shutoff with downstream piping removed. A wafer body depends on both flanges for clamping, while lugs bolt to each flange independently.
- Flange standard
- Match the flange drilling (ASME Class 150, PN10/PN16) of the mating flanges. Bolt circles differ between standards.
- Liner/seat elastomer
- EPDM for water, NBR (Buna-N) for oils, FKM or PTFE-lined for chemicals. The seat is the wetted seal and the usual failure point.
- Operator
- Use lever handles on small sizes and gear operators on larger sizes or higher differential pressure. Torque rises with size, and levers can slam shut and cause water hammer.
- Disc material
- Ductile iron with coating for water, stainless or aluminum bronze for corrosive media. The disc stays in the flow stream permanently.
Brands that matter
- Keystone (Emerson): Long-established resilient-seated butterfly valves.
- Bray: Widely used resilient-seated butterfly valves for industrial and HVAC use.
- Asahi/America: Thermoplastic butterfly valves for chemical service.
- Hayward Flow Control: PVC butterfly valves for water treatment and pools.
- Milwaukee Valve: Commercial HVAC butterfly valves.
- NIBCO: Iron butterfly valves for building services.
What to avoid
- Wafer valves used as dead-end isolation
- Lever operators on large lines prone to water hammer
- Installing without centering, which lets the disc hit the pipe ID