NAF – Turnex Pneumatic Control ActuatorEnquire Now

BRAND: NAFCATEGORY: Actuators, Control Valves,

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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Specifications

Series	Turnex
Design	High Modulating Pneumatic Control
Features	Smooth, Low-Friction Operation – Piston rods and linkage mounted in PTFE-coated bearings reduce transverse loads and ensure smooth motion. Direct Mounting for Automation Components – Interfaces for direct mounting of NAF-D30 positioners, pneumatic/electro-pneumatic controllers, solenoid valves (NAMUR) and limit switches. Internal Air Passages – Integrated compressed-air channels eliminate external air piping, reducing leak potential and simplifying installation. Flexible Stem Adaptation – Sleeve system (sizes 1–3) allows a single actuator size to suit multiple stem diameters; sizes 0, 4, 5 use matched levers. Fail-Safe Spring-Return Options – “Spring to close” or “spring to open” available with safely removable spring cartridges. Suitable for emergency shut-down requirements. Wide Performance Range – Cylinder diameters 50–320 mm; torque output from 60 Nm up to 20 000 Nm depending on size and configuration. Adjustable End Positions – Stop screws at each cylinder end allow accurate adjustment of open and closed travel positions. Environmental & Safety Compliance • ATEX-certified versions available for explosive gas and dust atmospheres (II 2 G/D c).
Torque Range	Up to 20,000 Nm
Max Pressure	8 Bar
Materials	Aluminum body and housing epoxy coated with stainless steel tie rods and fasteners
Options & Accessories	Double acting and spring return Manual overrides High temp extensions Profibus Valve Positioners HART Valve Positioners Position monitors / Switch Boxes
Applications	On/off and high modulating control for quarter turn valves and direct mounting to NAF quarter turn valves