Air Torque Pneumatic Actuator AT251U-S10-A F05/F07-N-17DS – 90° Rotation

Product Description

Air Torque Pneumatic Actuator AT251U-S10-A F05/F07-N-17DS – Rack & Pinion, 90° Rotation, Anodised Aluminium, SIL?3

The Air Torque AT251U-S10-A F05/F07-N-17DS is a spring-return pneumatic actuator designed for fail-safe quarter-turn valve automation in demanding industrial applications. Featuring a precision rack & pinion mechanism, it delivers dependable 90° actuation and automatically returns the valve to its default position on air supply loss. The actuator’s enclosure of hard-anodised aluminium ensures durability and corrosion resistance. Full SIL?3 certification makes it suitable for integration into safety-instrumented systems.

?? Key Features

• Spring-Return Design (S10): Provides fail-safe positioning upon loss of air pressure.

• Stable Torque Performance: Rack & pinion mechanism ensures smooth motion and consistent force.

• Flexible Interface: Compatible with ISO 5211 F05 or F07 flange and 17?mm square DS17 shaft for broad valve compatibility.

• Robust Housing: Anodised aluminium body for long-term reliability in harsh conditions.

• SIL?3 Certified: Built to meet stringent safety standards in functional safety loops.

• External Travel Stops: ±5° adjustable stops allow accurate stroke end alignment.

• Namur Mounting Standard: VDI/VDE?3845 interface for attaching solenoids, switchboxes, or positioners.

?? Technical Specifications

Technical Specs