Air Torque Pneumatic Actuator AT551U-D-A F14-N-36DS – 90° Rotation

Air Torque Pneumatic Actuator AT551U-D-A F14-N-36DS – Rack & Pinion, 90° Rotation, Anodised Aluminium, SIL3

The Air Torque AT551U-D-A F14-N-36DS is a high-performance double-acting pneumatic actuator engineered for precise and reliable quarter-turn valve control in industrial systems. Featuring a robust rack & pinion mechanism, it delivers smooth 90° actuation, while being enclosed in a hard-anodised aluminium casing for excellent resistance to corrosion and wear. Compatible with ISO 5211 F14 flange mounting and equipped with a 36?mm square (DS36) drive shaft, this actuator is perfectly suited for medium-to-large valve assemblies. Fully SIL?3 certified, it is ideally suited for integration into safety-critical valve control applications where torque consistency and system reliability are vital.

Key Features

• Double-Acting Operation (D-A): Enables controlled motion in both open and closed directions

• Consistent Torque Delivery: Rack & pinion operation ensures smooth, reliable actuation throughout the stroke

• Valve Mounting Compatibility: ISO F14 flange with DS36 output shaft for broad interface coverage

• Rugged Construction: Hard-anodised aluminium housing for durability in harsh industrial environments

• Functional Safety Certified: SIL?3 compliant for safe integration in high-integrity systems

• External Travel Stops: ±5° adjustable stops for precise stroke control

• Accessory Mounting Interface: Namur VDI/VDE?3845 compatible for solenoids, switchboxes, and positioners

Technical Specifications

Ideal Applications

• Heavy-duty valve automation in oil & gas, power generation, water/wastewater, chemical, and industrial automation sectors

• Actuation of ball, butterfly, or plug valves requiring ISO F14 mount and DS36 shaft interface

• Integration into safety-instrumented control loops where SIL?3 rating is essential