Pneumatic Actuators

AT Series Rack and Pinion Actuators

Compact, symmetrical twin-piston design providing linear, balanced torque output. The standard, cost-effective choice for small-to-medium quarter-turn valves.

AW Series Scotch Yoke Actuators

Heavy-duty U-shaped torque curve design delivering massive break-away torque (up to 50,000+ Nm). Engineered specifically for high-pressure, large-bore ball and butterfly valves.

Need Custom Pneumatic Actuation?

Beyond catalog standards, we engineer specialized pneumatic packages—including high/low temperature seal options (-40°C to +150°C), custom ISO 5211 adapter brackets, stroke speed throttling controls, and fast-exhaust emergency safety valves.

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Download Full Pneumatic Actuator Catalog

Get instant access to comprehensive engineering data sheets, ISO 5211 dimensional schematics, NAMUR accessory interface drawings, dynamic air consumption tables, and output torque curves across our AT and AW families.

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Motion & Torque Profile

Identify valve rotation (90° quarter-turn) and understand the required torque profile: linear torque for butterfly valves vs high breakaway/unseating torque for ball valves.

Actuator Drive Mechanism

Select AT Rack & Pinion for compact dimensions, high cycling speeds, and linear torque, or AW Scotch Yoke for heavy-duty break-away torque on large-bore lines.

Operational Mode (DA vs SR)

Choose Double-Acting (DA) for balanced air-driven open and close cycles, or Single-Acting Spring-Return (SR) for automatic mechanical fail-safe closure or opening upon air loss.

Plant Air Supply Pressure

Specify available shop air pressure (standard 4 to 7 bar / 60–100 psi). Our engineers apply a 30%–40% safety factor over maximum line pressure to prevent actuator stalling.

ISO 5211 & NAMUR Standard

Verify valve top flange mounting pattern (F03 through F36) and stem drive (double-square or keyed). Top auxiliary interface conforms strictly to NAMUR VDI/VDE 3845.

Pneumatic Accessories Integration

Select automation controls: NAMUR solenoid valve (24VDC / 220VAC), mechanical/inductive limit switch box, air filter regulator (F.R.L.), or 4-20mA electro-pneumatic positioner.

Operating Ambient & Seals

Select seal elastomer based on temperature: standard NBR (-20°C to +80°C), low-temp Silicone (-40°C), or high-temp Viton/FKM (+150°C). Certified to ATEX Ex II 2GD for explosive zones.

Final Review & Factory Sizing Quote

Submit your valve type, size, differential pressure, and plant air supply to our engineers for exact torque verification, 3D CAD drawings, and factory pricing.

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Millisecond Fast Response & 1M+ Cycle Life

Equipped with low-friction composite piston guide bands and mirror-honed hard-anodized aluminum cylinder barrels. DELCO pneumatic actuators deliver instant millisecond stroke times and proven durability exceeding 1,000,000 continuous full-cycle operations.

Heavy-Duty AW Scotch Yoke Torque Technology

Our AW scotch yoke series generates parabolic U-shaped torque curves peaking at the exact start and finish of rotation (up to 50,000+ Nm). It effortlessly overcomes peak valve seating friction while consuming up to 30% less compressed air than conventional rack-and-pinion actuators.

Inherent Explosion-Proof ATEX Ex II 2GD Safety

Powered purely by air without electric coils, circuit boards, or motor spark hazards. Certified to ATEX Directive 2014/34/EU and SIL 2/3, DELCO pneumatic actuators represent the intrinsically safe choice for explosive gas, refining hydrocarbons, and combustible dust environments.

Standardized NAMUR & ISO 5211 Direct Mount

Manufactured strictly to ISO 5211 bottom mounting dimensions and NAMUR VDI/VDE 3845 top interfaces. Enables direct bracketless assembly onto industrial valves, while allowing plug-and-play installation of universal solenoid valves, limit switch boxes, and smart positioners.

Pre-Stressed Mechanical Spring-Return Fail-Safe

Single-Acting models feature pre-compressed, epoxy-coated alloy spring cartridges safely contained within modular end-caps. In the event of plant compressed air loss or electrical interlock disruption, mechanical spring force instantly returns the valve to a predetermined safe position (Fail-Close or Fail-Open).

100% Pneumatic Decay & Dynamic Torque Testing

Every actuator undergoes 100% factory pneumatic pressure decay leak testing (zero internal bypass and external stem leakage) and full-travel dynamic torque calibration per EN 15714-3 standards, complete with signed factory inspection certificates before dispatch.