TOP 5 Pneumatic Rotary Actuator Manufacturers

Festo is a company founded in 1925 and headquartered in Germany that provides actuation technology for the global industry. It has 61 companies and 250 branches worldwide, with approximately 21,000 employees. No matter where you are, Festo has a way to contact you and provide solutions based on your needs.
Festo offers a variety of pneumatic actuators to meet your drive needs.

NORGREN was founded in 1925. Entrepreneur Carl Norgren designed a system dedicated to solving the maintenance and lubrication problems of customers using pneumatic tools and equipment. In 1972, IMI plc acquired NORGREN and became the fluid power division of IMI, providing high-quality pneumatic and fluid control products to customers around the world.

NORBRO is a sub-brand of Flowserve, headquartered in the United Kingdom. NORBRO is committed to providing customers with automated pneumatic rotary actuators. Founded in 1790, Flowserve operates in more than 50 countries and more than 300 locations around the world and has more than 17,500 employees.
Flowserve has many sub-brands, providing a variety of automation solutions for global industrial customers.

CAMOZZI was established in 1964 as a global leader in the design and production of motion and fluid control accessories for industrial automation. With 14 production bases, 50 distributors, 30 subsidiaries and service centers around the world, it can provide fast and convenient solutions to customers all over the world.

Numatics is a sub-brand of Emerson, providing high-quality pneumatic rotary actuators to meet your various needs. Emerson is committed to solving process control challenges for customers. Established in 1890, Emerson is a manufacturer of electric motors and fans. After more than 100 years of development, Emerson has become a leader in global automation solutions.
Emerson also has many sub-brands to provide you with one-stop fluid control solutions.

What is Pneumatic Rotary Actuator?

A rotary actuator is a pneumatic cylinder used to provide a turning or angular movement, allowing a stroke in an oscillating motion through a defined angle. They are durable and give a relatively high force (torque) for size. Rotary actuators simplify a design and can reduce maintenance issues.

Types of Pneumatic Rotary Actuator

Rack-and-pinion

A rack-and-pinion consists of a circular gear (the pinion) engaged to a linear gear (the rack). When actuated, the piston which is attached to the rack moves linearly. Due to the gear connection to the pinion, it rotates it with the attached output shaft effectively turning the linear motion into rotational.

Often two pistons and racks are installed on the opposite side of each other to double the amount of torque on the pinion as shown in Figure 3. In this double acting actuator, the two chambers on the sides are filled with pressurized air which push the pistons to the center. To return the pistons to the initial position, the chamber in the center is in turn pressurized.

The rack and pinion design has a fairly high mechanical efficiency. They can product a torque range from a couple Nm to multiple thousands of Nm.

Scotch Yoke

In a Scotch Yoke mechanism, the shaft of the piston is engaged with a rotary shaft via a pin and a slot, as shown in Figure 5. The linear motion of the shaft causes the pin to rotate. Scotch yoke actuators can be spring return or double acting. These actuators can also be equipped with two opposing pistons to double the amount of torque on the output shaft as shown in Figure 5 on the right. Scotch yoke actuators are heavy duty actuators producing torques ranging from multiple thousands to hundreds of thousands of Nm.

How does Pneumatic Rotary Actuator work?

A pneumatic rotary actuator uses compressed air to generate its operating energy. Some are designed specifically to remotely control valves. The clean, dry air can be provided via a central compressed air station, or in case of a compressed gas system, from the process gas. The waste gas can then be released into the air or a downstream lower-pressure process piping. They are commonly used to automate and remotely control quarter turn or multi-turn valves, like ball or butterfly valves.

A pneumatic rotary actuator consists of one or more air chambers with a piston or a bellows diaphragm. Depending on the design, the air pressure forces the piston or the diaphragm to move creating linear or rotary motion. If the created motion is linear, it then internally converts the linear motion to rotational motion. Pneumatic rotary actuators are durable, offer high force relative to their size and can be used in hazardous environments.

Generally, to drive a rotary valve, a rotary actuator is used. However, there are also designs that use pneumatic cylinders, which create linear motion, to generate torque by means of pivot arms or bearings. However, specifying pneumatic rotary actuators for these applications can simplify the design and increase service life. Pneumatic rotary actuators are self-contained, therefore, their parts are not exposed to contaminants and aggressive environments meaning they are less likely to require maintenance over their lifetime.

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