Fergo offers automated pneumatic butterfly valves in sizes from DN25 up to DN1200. For sizes up to DN300 you can order directly online, and for DN300 (12″) to DN1200 (48″) please contact our customer service.
A butterfly valve with pneumatic actuation is an efficient and reliable valve for controlling the flow of liquids and gases in industrial applications. This pneumatic valve is actuated by compressed air, enabling swift and precise control.
There are two principal types of pneumatic butterfly valves: double‑acting and single‑acting. In a double‑acting pneumatic butterfly valve, the valve disc is moved in both directions by compressed air, enabling very precise control of...
Fergo offers automated pneumatic butterfly valves in sizes from DN25 up to DN1200. For sizes up to DN300 you can order directly online, and for DN300 (12″) to DN1200 (48″) please contact our customer service.
A butterfly valve with pneumatic actuation is an efficient and reliable valve for controlling the flow of liquids and gases in industrial applications. This pneumatic valve is actuated by compressed air, enabling swift and precise control.
There are two principal types of pneumatic butterfly valves: double‑acting and single‑acting. In a double‑acting pneumatic butterfly valve, the valve disc is moved in both directions by compressed air, enabling very precise control of position and flow rate. In contrast, a single‑acting pneumatic butterfly valve operates with compressed air in one direction and returns by means of a spring.
Automated Butterfly Valve
Fergo supplies fully assembled butterfly valves with pneumatic or electric actuators, including accessories such as solenoid valves, mounting brackets, adapters and add‑on components like position indicators, end‑switches and positioners.
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How does a single‑acting pneumatic butterfly valve work?
A single‑acting pneumatic butterfly valve uses a pneumatic actuator powered by compressed air. The actuator opens the valve by moving a membrane or piston with compressed air, rotating the disc into the open position and allowing flow. When the air supply stops, an integrated spring returns the butterfly valve to its original “fail‑safe” position (typically closed).
How does a double‑acting pneumatic butterfly valve work?
A double‑acting pneumatic butterfly valve uses a pneumatic actuator that employs compressed air for both opening and closing the valve. Unlike single‑acting drives, the double‑acting actuator does not use a return spring, but controls both directions exclusively with air pressure.
By feeding compressed air into the appropriate chamber of the actuator, the disc is rotated precisely into the required position to regulate or completely stop the flow. This design offers greater control flexibility and is typically used in applications requiring rapid and accurate switching.
Important accessories for pneumatic butterfly valves: Optimising functionality & automation
For butterfly valves with single‑ or double‑acting pneumatic actuators there are numerous accessories available that enhance performance and automation. Key items include end‑switch boxes, which transmit valve position feedback to control systems like PLCs, and solenoid valves, which convert electrical signals into pneumatic action and control air supply.
A mounting bracket (air‑distribution plate) ensures efficient air routing, while a positioner enables proportional control of the valve, ideal for control‑system applications. A filter‑regulator cleans and stabilises the air supply, extending actuator life. Manual override allows operation in emergency mode, and feedback sensors enable accurate monitoring of the valve’s performance.
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