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Butterfly Valves with Pneumatic Actuator — Ready-to-Install Assemblies
Automated butterfly valves with pneumatic actuators offer the fastest and most reliable solution for remote ON/OFF and modulating flow control in industrial pipelines. At Cematic, every assembly is pre-mounted, tested, and ready to install — valve body, rack-and-pinion pneumatic actuator, and optional accessories (solenoid valve, limit switch box, positioner, filter-regulator) supplied as a complete unit.
How does a pneumatic actuated butterfly valve work?
Compressed air (typically 60–100 PSI) is supplied to the actuator, driving a rack-and-pinion mechanism that rotates the valve disc 90° from open to closed. In double-acting configuration, air drives both opening and closing. In single-acting (spring return) configuration, air opens the valve while a spring closes it automatically when air pressure is lost — providing a fail-safe closed position critical for safety-sensitive processes.
Assembly configurations available
- Double-Acting (DA): Air to open, air to close. Higher torque output. Ideal for frequent cycling and modulating service.
- Single-Acting Spring Return (SR): Fail-safe closed or fail-safe open. Required for safety shutoff in chemical, gas, and hazardous fluid applications.
- Valve bodies: Wafer iron/carbon steel, stainless steel SS304/SS316, anticorrosive PFA-lined, PVC, and high-performance double-eccentric.
- Actuator sizes: DA32 to DA400 — covers valve sizes from 2" to 24" and beyond.
- Mounting standard: ISO 5211 direct mount — no brackets or coupling hardware required for compatible valves.
Optional accessories included on request
- Solenoid valve (5/2 or 3/2 way): 24VDC, 110VAC, or 220VAC coil for electrical control signal
- Limit switch box: Visual and electrical position feedback (open/closed indication)
- Filter-regulator: Air supply conditioning to protect actuator internals
- Electro-pneumatic positioner: For modulating control with 4–20 mA or 3–15 PSI signal
- Manual override: For valve operation during air supply failure
Industrial applications
Pneumatic actuated butterfly valves from Cematic are specified in water and wastewater treatment plants, chemical and petrochemical processing, food and beverage production lines, pharmaceutical manufacturing, power generation, mining operations, and HVAC systems throughout North America.
Technical selection guide
| Parameter | Consideration |
|---|---|
| Actuator action | Double-acting for normal service; spring-return for fail-safe requirement |
| Air supply | Minimum 60 PSI required; 80–100 PSI recommended |
| Torque sizing | Always apply 25–30% safety factor over valve breakaway torque |
| Control signal | ON/OFF (solenoid) or modulating (positioner + 4–20 mA) |
| Feedback | Limit switch box for PLC/SCADA position monitoring |
Request your technical datasheet and quote — our engineering team will size the actuator correctly for your valve and process conditions.