Air Torque Pneumatic Actuator AT451U-S10-A F10/F12-N-27DS – 90° Rotation

Air Torque Pneumatic Actuator AT451U-S10-A F10/F12-N-27DS – Rack &?Pinion, 90° Rotation, Anodised Aluminium, SIL?3

The Air Torque AT451U-S10-A F10/F12-N-27DS is a high-integrity, spring-return pneumatic actuator designed to ensure precise and fail-safe quarter-turn valve automation. Featuring a superior rack & pinion drive, it delivers consistent 90° motion and returns the valve to a safe position if compressed air is lost. Built with a hard-anodised aluminium housing, this actuator offers outstanding durability and corrosion resistance. Fully SIL?3 certified, it’s ideal for integration into functional safety systems in industrial sectors.

Key Features

• Spring-Return Operation (S10): Automatically defaults valve to safe position when air pressure drops.

• Smooth Torque Profile: Rack & pinion drive ensures consistent force during the entire rotation.

• Valve Interface Flexibility: Compatible with ISO 5211 F10 or F12 flange plus a 27?mm square DS27 shaft—suitable for medium to large valve configurations.

• Sturdy Construction: Anodised aluminium housing provides long-term service life in harsh environments.

• Functional Safety Certified: SIL?3 compliance enables use in safety-critical control loops.

• Precision Adjustment: ±5° adjustable stops for exact end-of-stroke positioning.

• Accessory Ready: Namur VDI/VDE 3845 port supports solenoids, positioners, and limit switches.

Technical Specifications