Double Acting Pneumatic Lug Butterfly Valve
Double Acting Pneumatic Lug Butterfly Valve; a lug-type butterfly valve with threaded ears for individual flange mounting and usable as an end valve, with an ISO 5211-connected rack-and-pinion pneumatic actuator mounted on top. The valve is remotely and automatically controlled by pressurised air. In double acting mode, the valve is rotated in both opening and closing directions by air. Without a spring, it delivers the same torque with a smaller actuator and operates faster; when air is cut off, the valve remains in its last position.
The actuator body is aluminium extrusion and thanks to its NAMUR interface, solenoid valves, limit switches (position sensors) and positioners can be directly attached. Available in DN32–DN300 with stainless steel, nickel-plated or bronze discs and EPDM, NBR, Viton or PTFE seals. Actuator size is selected according to valve diameter and line pressure.
Benefits
- More compact and economical actuator for the same torque
- Fast quarter-turn opening and closing
- Position retention when air supply is cut off
- NAMUR interface for solenoid and limit switch installation
- Various disc and seal options
Applications
- Process automation and PLC-controlled systems
- Water treatment and filter backwash systems
- Pump stations
- HVAC and cooling towers
Technical Specifications
| Nominal diameter | DN32–DN300 |
|---|---|
| Actuator type | Pneumatic, double acting |
| Fail-safe position | None (remains in last position) |
| 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 diameters) |
| Connection | Lug (threaded ears) |
Materials
| Body | GG-25 grey cast iron or GGG40 ductile iron, epoxy coated |
|---|---|
| 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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