Single Acting Pneumatic Wafer Butterfly Valve
Single Acting Pneumatic Wafer Butterfly Valve; a wafer-type butterfly valve clamped between two flanges with bolts, fitted with an ISO 5211 rack-and-pinion type pneumatic actuator mounted on top, remotely and automatically controlled by compressed air. In the single acting (spring-return) actuator, the valve rotates in one direction by air pressure and returns to its initial position by internal springs when air is cut off. This ensures the valve automatically moves to a safe position (normally closed or normally open) in the event of energy or air loss.
The actuator body is aluminium extrusion and thanks to the NAMUR interface, solenoid valves, limit switches (position switches) and positioners can be mounted directly. Available from DN25 to DN600 with stainless steel, nickel-plated or bronze discs and EPDM, NBR, Viton or PTFE seals. Actuator size is selected according to valve bore, flow rate and line pressure.
Advantages
- Automatic fail-safe position on air or power loss
- Normally closed (NC) or normally open (NO) option
- Quick quarter-turn open-close
- Solenoid and limit switch installation via NAMUR interface
- Various disc and seal options
Applications
- Emergency isolation points
- Process automation
- Water treatment and dosing systems
- Boiler and burner lines
Technical Specifications
| Nominal bore | DN25 – DN600 |
|---|---|
| Actuator type | Pneumatic, single acting (spring-return) |
| Fail-safe position | Normally closed (NC) or normally open (NO) |
| Actuator connection | ISO 5211; NAMUR solenoid interface |
| Control fluid | Dry and filtered compressed air |
| Options | Solenoid valve, limit switch, positioner |
| Working pressure | PN16 (up to DN300); PN10 (larger sizes) |
| Connection | Wafer (between two flanges) |
Materials
| Body | GG-25 grey cast iron or GGG40 ductile iron, epoxy painted |
|---|---|
| Disc | AISI 316 stainless steel, nickel-plated ductile iron or aluminium bronze |
| Stem | AISI 420 stainless steel |
| Seal | EPDM, NBR, Viton (FKM) or PTFE |
| Actuator body | Aluminium extrusion, aluminium cast pistons |
| Actuator seals | Nitrile rubber (NBR) |
Why ORFA?
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