Pneumatic Rotary Actuators

Pneumatic rotary actuators are devices operated by compressed air that produce rotary motion via a shaft to control the speed and rotation of attached equipment. Available in rack and pinion and rotary vane designs, and in both double-acting and single-acting configurations, they are essential components in industrial automation, valve actuation and process control systems.

RS Australia stocks a wide range of pneumatic rotary actuators including rack and pinion actuators, rotary vane actuators, and both single-acting and double-acting configurations to suit light-duty, heavy-duty, and precision automation applications.

Key Uses of Pneumatic Rotary Actuators

• Converts compressed air into precise rotary motion: clean, reliable and free from electrical hazards.
• Double-acting design applies air to both sides of the piston for full bidirectional control.
• Single-acting design uses spring return, making it ideal for fail-safe applications.
• Compact, lightweight construction suited to tight installation spaces.
• Rotation angles of 90°, 180° or 270° for versatile valve and equipment positioning.
• Wide bore range from 6 mm to 240 mm to match varying torque requirements.
• RoHS and REACH compliant; select Festo models are repairable by end users under Better World certification.

Shop Our Range of Pneumatic Rotary Actuators

Both designs are available as double-acting, where air is supplied to both sides of the piston, or single-acting, where air is supplied to one side only.

Rack and Pinion Rotary Actuators

Rack and pinion rotary actuators have a better range of rotation and torque than the vane type and are usually larger in size, ideal for medium-duty applications that require more speed. They also have a longer lifespan than vane-type actuators.

Their robust construction makes them well-suited to heavier industrial applications requiring consistent, high-torque rotational output. Available from SMC across the CRB1, CRB2, CDRB2, CRQ2 and MSQ series.

Rotary Vane Pneumatic Actuators

Rotary vane actuators are more limited in rotation than the rack types and are often used for lighter loads. Their more compact and lightweight construction makes them a practical choice where installation space is restricted and load demands are lower. Available from Festo across the DSR and DRVS series.

How to Choose the Right Pneumatic Rotary Actuator

Selecting the correct rotary pneumatic cylinder depends on the torque requirement, rotation angle, operating pressure and available installation space. Key factors to evaluate include:

• Actuator type: Rack and pinion for higher torque and longer service life; rotary vane for compact, lighter-duty applications.
• Rotation angle: Confirm whether 90°, 180° or 270° rotation is required for the valve or equipment being driven.
• Bore size and torque: Match bore diameter to the torque output needed. Larger bores produce greater torque.
• Double-acting vs single-acting: Double-acting for bidirectional control; single-acting for spring-return fail-safe requirements.
• Operating pressure: Verify the actuator's rated pressure range matches the available supply.
• Environmental conditions: Consider temperature range, media compatibility and whether the application is in a hazardous or wash-down environment.
• Interface and mounting: Confirm shaft, port and mounting dimensions align with existing equipment and valve interfaces.

Common Industry Applications

Pneumatic rotary actuators are commonly used in industrial applications for conveying, clamping, transferring parts, positioning and controlling valves, and can be used in hazardous areas. Specific application areas include:

• Industrial Automation: Robotic arm positioning, pick-and-place systems and rotary indexing tables.
• Valve Actuation: Quarter-turn ball valves, butterfly valves and dampers in process plants using rotary valve actuators.
• Packaging Machinery: Conveyor diverters and rotary transfer systems.
• Food and Beverage Processing: Hygienic valve actuation and filling equipment.
• Automotive Manufacturing: Assembly line tooling and part transfer systems.
• Oil and Gas: Pipeline valve control and offshore equipment using rack and pinion actuators.
• Material Handling: Bin tipping, pallet rotation and rotary transfer applications.

Your Trusted Pneumatic Rotary Actuator Supplier in Australia

RS Australia is a trusted supplier and distributor of pneumatic rotary actuators, rack and pinion actuators and rotary air actuators, stocking products from leading brands including SMC, Festo and Siemens. If you require related products such as pneumatic rodless cylinders, pneumatic bellows or compact air bellows, we’ve got you covered as well.

Full product specifications and datasheets are available online to support accurate selection. Place your order today for fast, reliable delivery across Australia. To find out more about our shipping options and timelines, please refer to our delivery page.