Single Acting Pneumatic Lug Butterfly Valve
Single Acting Pneumatic Lug Butterfly Valve; a lug-type butterfly valve with threaded lugs for independent flange mounting, usable as a terminal valve, with an ISO 5211-mounted rack-and-pinion pneumatic actuator, remotely and automatically controlled by pressurised air. In a single-acting (spring return) actuator, the valve rotates one way with air; when air is cut off, internal springs return the valve to its starting position. This ensures that on power or air loss, the valve automatically enters a safe position (normally closed or normally open).
The actuator body is aluminium extrusion and thanks to its NAMUR interface, solenoid valves, limit switches (position switches) and positioners can be directly mounted. Available between DN32–DN300; with stainless steel, nickel-plated or bronze discs and EPDM, NBR, Viton or PTFE sealing options. Actuator size is selected according to valve size and line pressure.
Advantages
- Automatic fail-safe position on air or power loss
- Normally closed (NC) or normally open (NO) option
- Quick quarter-turn opening and closing
- Solenoid and limit switch mounting via NAMUR interface
- Various disc and sealing options
Applications
- Safety shut-off points
- Process automation
- Water treatment and dosing systems
- Boiler and burner lines
Technical Specifications
| Nominal diameter | DN32–DN300 |
|---|---|
| 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 |
| Operating pressure | PN16 (up to DN300); PN10 (larger sizes) |
| Connection | Lug (threaded lugs) |
Materials
| Body | GG-25 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 |
| Seat | EPDM, NBR, Viton (FKM) or PTFE |
| Actuator body | Aluminium extrusion, aluminium cast pistons |
| Actuator seals | Nitrile rubber (NBR) |
Why ORFA?
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