Industrial Pneumatic Butterfly Valve Assemblies

Pneumatic Wafer Butterfly Valve

Designed for an ultra-compact footprint, this lightweight valve is sandwiched between pipe flanges for rapid installation. It is the most cost-effective automated package for general HVAC, cooling water, and low-pressure municipal utilities.

Pneumatic Lugged Butterfly Valve

Featuring threaded metallic inserts (lugs) around the valve body, this robust design allows the downstream piping to be disconnected without depressurizing the upstream side. It is the critical automated choice for dead-end service and rigorous pipeline maintenance zones.

Pneumatic Sanitary Butterfly Valve

Manufactured from mirror-polished stainless steel with Tri-clamp connections and FDA-approved food-grade seals. This automated valve guarantees lightning-fast, zero-dead-leg flow control for strict dairy, beverage, and biotech sterile processing environments.

Pneumatic Flange Butterfly Valve

Built with integral double-flanged ends (ANSI/DIN/JIS) to withstand immense mechanical stress and pipeline vibration. Driven by heavy-duty AW Series actuators, this is the ultimate large-diameter solution for high-capacity waterworks, shipbuilding, and heavy petrochemical plants.

Pneumatic Fluorine-lined Butterfly Valve

Fully encapsulated with premium PTFE or PFA, this valve provides absolute defense against highly volatile and corrosive media. It acts as a fail-safe isolation barrier for demanding chemical processing, acid transport, and chlor-alkali facilities.

Pneumatic Hard-Seated Butterfly Valve

Engineered with a robust metal-to-metal sealing structure (often utilizing double or triple offset designs). This rugged automated valve easily cuts through abrasive particulates and withstands extreme temperatures (+400°C and above) in power generation, steam lines, and severe refining applications.

Pneumatic Vacuum Butterfly Valve

Specially configured with high-density resilient seals and strict leak-detection testing to prevent air ingress under negative pressure conditions. It ensures absolute vacuum integrity for semiconductor manufacturing, vacuum drying, and specialized material handling.

Pneumatic Actuators (AT & AW Series)

Engineered to power our automated solutions, we offer the AT Series (Rack-and-Pinion) for compact, high-cycle constant torque, and the heavy-duty AW Series (Scotch Yoke) for maximum breakaway power. Featuring standard NAMUR mounting, they perfectly match the exact torque demands of any standard, high-pressure, or large-diameter pipeline.

Need Custom Actuation?

Beyond our standard series, we provide custom actuator sizing, mounting bracket manufacturing, and specialized control signals (Modbus, Profibus) tailored to your exact DCS requirements.

Download Full Catalog

Get comprehensive technical data sheets, CAD drawings, wiring diagrams, and torque charts for the entire pneumatic butterfly valve family.

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Valve Body & Connection

Specify your required connection style: Wafer (space-saving), Lugged (for dead-end service), Double Flange (heavy-duty/large diameter), or Tri-Clamp (sanitary).

Disc & Seat Materials

Select sealing trims based on media: EPDM/NBR for water, PTFE/PFA for severe chemicals, or Hard-Seated Metal for abrasive slurry and high-temperature steam. Also, note if the system operates under vacuum/negative pressure.

Nominal Size & Pipeline Pressure

Define pipe size (DN40 to DN1200+ / 1.5" to 48"+) and working pressure (PN10-PN160 / Class 150-900) to calculate the precise breakaway torque required to move the large disc.

Operating Temperature

Provide working temperature ranges (-40°C to +600°C) to ensure the correct specification of internal bearings, packing, and seat materials (resilient vs. metal).

Actuator Series & Action Type

Select actuation mode: Double-Acting or Spring-Return (Fail-Safe). Our engineers will match the valve with an AT Series actuator for standard cycles, or a high-torque AW Series Scotch Yoke for large-diameter or hard-seated valves.

Pneumatic Accessories & Control

Specify solenoid valves (AC220V/DC24V), limit switch boxes for DCS feedback, FRL air prep units, or electro-pneumatic positioners (4-20mA) for proportional flow regulation.

Final Review & Quote

Submit your specs for a rapid engineering review. We provide complete actuator air-supply sizing, CAD models, and customized global pricing.

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Fully Assembled & Factory Calibrated

Stop struggling with mismatched components on-site. DELCO delivers integrated valve and actuator assemblies—pre-mounted, stroke-adjusted, and tested as a complete unit for genuine plug-and-play installation.

Expert Torque Matching (AT & AW Series)

Butterfly valves, especially hard-seated and large-diameter models, require massive breakaway torque. Our engineers meticulously calculate torque curves against your plant's air supply (4-8 bar) and equip the valve with the perfect AT or AW Series actuator, complete with a 30% safety margin to ensure zero jamming.

Fail-Safe Reliability for Critical Safety

In the event of an electrical or air supply failure, our single-acting (spring-return) pneumatic packages instantly drive the massive valve disc to a predetermined safe position (Fail-Open or Fail-Closed), preventing catastrophic pipeline overflows.

100% Quality Verification & Class VI Sealing

Every assembled package undergoes rigorous hydrostatic and pneumatic testing per API 598 / ISO 5208 standards. Whether it's a resilient soft seal or a high-temp metal seat, we certify absolute bubble-tight or standard-compliant shut-off before dispatch.

Global Distributor & OEM Support

We protect our partners. DELCO supplies comprehensive EN 10204 3.1 material certificates, CE/ATEX documentation, and offers highly flexible OEM private labeling, custom nameplates, and neutral packaging to safeguard your commercial margins.