NAF – Turnex Pneumatic Control Actuator

About NAF – Turnex Pneumatic Control Actuator

High-Modulating Pneumatic Actuator for Ball, Segment and Butterfly Valves

The NAF-Turnex pneumatic actuator is engineered for precise modulating control and reliable on/off service across a wide range of industrial applications. Designed for 90° rotary valves, it delivers maximum torque at the closed position, ensuring strong seating force where it is needed most during isolation duties. Internal air passages, maintenance-free operation and direct mounting capability make Turnex a preferred option for automation specialists responsible for plant uptime and loop stability.

Its robust mechanical design includes PTFE-coated bearings, adjustable end-stop positions, sleeve-based stem adaptation (sizes 1–3) and a choice of double-acting or spring-return configurations for fail-safe operation. With direct mounting interfaces for valve positioners, solenoid valves and limit switches, Turnex creates a compact, vibration-resistant control assembly when combined with NAF valves and the NAF-D30 intelligent positioner.

Whether installed on ball valves, ball-sector valves or high-performance butterfly valves, the NAF-Turnex offers smooth travel, stable torque behaviour and long service life, even under demanding operating conditions.

For instrument technicians, engineers and production managers, this means:

• Stable and accurate control – Smooth piston movement with PTFE-coated bearings ensures repeatable modulation and improved loop performance.
• Reduced external piping – Integrated internal air passages eliminate external tubing, reducing leak points and installation complexity.
• Fast adaptation to different valves – Flexible sleeve system (sizes 1–3) simplifies matching stem diameters without custom machining.
• Fail-safe operation where required – Spring-return options provide reliable “spring to close” or “spring to open” behaviour.
• Lower maintenance burden – Maintenance-free design and protected internal components extend service intervals.
• Optimised for NAF control packages – Direct mounting of positioners, solenoids and limit switches reduces footprint and improves vibration resistance.
• Improved commissioning – Adjustable limit stops and clear visual indication at the top of the actuator support fast field calibration.

Reliable automation. Accurate modulation. Fail-safe performance.

Download the NAF-Turnex Technical Bulletin

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