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Pneumatic Actuator

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1. What is a Pneumatic Actuator?

A pneumatic actuator is a device that converts compressed air or gas into mechanical motion. This motion can be used to regulate one or more final control elements. Pneumatic actuators are also known as pneumatic cylinders, air cylinders, and air actuators.

2.How Does a Pneumatic Actuator Work?

Pneumatic actuators are reliant on the presence of some form of pressurised gas or compressed air entering a chamber where pressure is built up. Once this exceeds the required pressure levels in contrast to the atmospheric pressure outside of the chamber, it creates a controlled kinetic movement of a piston or gear which can be directed in either a straight or circular mechanical motion.

 

The Types of Pneumatic Actuator

 

Single-acting Cylinder

Single-acting cylinders have one port that allows air to flow into the cylinder. The pressure increases and pushes the piston forward or backward, depending on whether it is a push or pull type. A large spring returns the piston to its original position, preparing it for another burst of pressure. The spring is either positioned inside the cylinder or on the outside.

Double-acting Cylinder

Double-acting cylinders operate without a spring and instead have two ports, one on either end of the piston. The first application of pressure pushes the piston forward, a step in the process that the two models share. Then, the second burst of pressure on the other side of the cylinder pushes the piston back into place. The device applies pressure back and forth to create a smooth linear motion.

Tie-rod Actuator

Tie-rod actuators are the most prevalent actuator design in the pneumatics industry and are widely used in heavy-duty and high-temperature industrial automation applications. They have square or rectangular end caps that are secured to the barrel by threaded tie rods and nuts, are equipped with static seals to prevent air leakage and are available in standard, compact and lightweight variations. They are also available with profile barrels, which feature concealed tie rods, enable direct assembly for flush-mounted switches and offer a cleaner appearance, and round barrels, which feature exposed tie rods, are available in a wide variety of configuration and mounting options and can easily be adapted to solve difficult actuation challenges.

Welded Actuator

Welded actuators are lighter and more compact than the standard tie-rod configuration and, as such, are widely used in lighter duty and lower force applications including mobile equipment. Instead of tie rods, these pneumatic actuators feature barrels welded directly to the end caps and ports welded to the barrel. Their front rod glands are generally bolted or threaded into the cylinder barrel to allow the piston rod assembly and rod seals to be removed for service and they typically come with fixed or buffer cushions, although some models offer adjustable cushioning upgrades.

 

 

 

Electric Actuator for Butterfly Valve
 

 

Compact Actuator

Compact actuators are designed for applications where space it at a premium and are available in a variety of options

Clamp Actuator

Clamp actuators are used to hold a workpiece in place while work is being done. They combine a standard pneumatic actuator with a clamp and a toggle mechanism and are often designed to exhibit robust resistance to weld splatter to ensure long lifetime performance.

Valve Actuator

Valve actuators generate linear or rotary motion to open and close valves. These pneumatic actuators are compatible with a variety of valves, including ball and butterfly valves.

Rotary Actuator

Rotary actuators produce a reciprocating angular or turning motion that enables an oscillating stoke motion through a defined angle. These pneumatic actuators are available in rack and pinion, rotary vane and helical options, feature simple, durable designs that reduce maintenance requirements and typically deliver relatively high force (torque) for their size. Rotary vane actuators are small, self-contained, double-acting actuators that take up less space than rack and pinion actuators but deliver lower torque. Rack and pinion actuators offer greater torque but can require a larger footprint to achieve certain angular motions.

 

The Applications of Pneumatic Cylinders

Pneumatic Wafer Butterfly Valve

Automobile Engine

Pneumatic actuators are used in a variety of automotive applications, including engine control, transmission control, and braking systems. Pneumatic actuators offer many advantages over hydraulic and electric actuators, including higher power density, lower weight, and more precise control.

Pneumatic Wafer Butterfly Valve

Material Handling

Pneumatic actuators are widely used in material handling applications. They are well suited for these applications because they can provide high force output with a relatively small footprint. Additionally, pneumatic actuators are often used in applications where precise control is required, such as in pick-and-place operations.

Pneumatic Wafer Butterfly Valve

Food and Beverage Production

Pneumatic actuators are used extensively in the food and beverage production industry due to their versatility, reliability, and cost-effectiveness. They are commonly used in conveyor systems to move products from one stage of production to the next, as well as in packaging and labelling machines.

Electric Modulating Valve Actuator

Robotic Applications

Robotic applications utilize actuators to create motion in wheels, clamps, and robot appendages. Grippers offer angular motion making them ideal for robotic arm applications. The duality of pneumatic actuators and robot arms are commonly seen in many manufacturing applications and offer a range of flexibility and safety.

Electric Modulating Valve Actuator

Clamping & Stamping

Pneumatic actuators are used in clamping and stamping applications to operate jaws holding products or marking an object. Pneumatic actuators offer a great deal of control which is necessary in clamping and stamping applications.

Electric Modulating Valve Actuator

Hazardous Applications

Pneumatic actuators are often used to open and close valves, therefore controlling the flow of liquids such as chemicals. (For this reason, pneumatic actuators can also be used in manufacturing applications requiring control over the flow of liquids.) With safety and reliability among the benefits of using pneumatic actuators, hazardous environments like chemical plants will often use these actuators due to their durabilit

 

 

Considerations for Pneumatic Actuator Performance

Electric Rotary Valve Actuator

Force factor

The force factor is simply the area of the cylinder piston. Force factor times air pressure equals the force produced by the cylinder.
Electric Part Turn Actuator

Speed

Higher speeds require a greater force margin to overcome increased system pressure losses.
Electric Rotary Actuator 90 Degrees

Sequencing

Adding sensors can shorten cycle times by eliminating time delays.
Electric Rotary Actuator Small

Other components

Available pressure at the cylinder can be affected by system compressor, filters, regulators, control valves, and all connecting piping. Right-sizing these components helps ensure the best performance from a cylinder.
Our Certificate

 

201903131647139906681
CE EX for valve actuator
201904150943378510703
ISO9001:2015
201903131647398225081
ODL OHQ CE
201903131650059492132
SIL-3 for valve actuator 01

 

 
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Ultimate Guide for Pneumatic Actuator

Q: What is the purpose of a pneumatic valve actuator?

A: Pneumatic actuators are designed to operate a piston within a closed cylinder. Pressure from an external air or gas source powers the actuator, moving the cylinder to fully open or close the valve, or partially modulate its open/close movement.

Q: What is the difference between electric actuator and pneumatic actuator?

A: For example, pneumatic actuators can provide a higher speed, but electric linear actuators provide the most precise control since air and fluid pressure are more difficult to control than electricity.

Q: Where are pneumatic actuators used?

A: Pneumatic actuators have a wide variety of applications. Among the most common and popular uses are the pistons and ignition chambers in gasoline-powered vehicles. They use ignition of the air and gasoline to create the pressurized force that eventually moves the piston and converts energy into the car's crankshaft.

Q: How do you control a pneumatic actuator?

A: If you are looking to control the speed of the pneumatic actuator in your application, the most effective way is to use a speed control valve or flow control valve to vary the amount of flow out of the exhaust port of the actuator.

Q: What is the most common type of pneumatic actuator?

A: Pneumatic cylinders are the most common type of pneumatic actuator and are well-suited for use in material handling applications. Pneumatic actuators are used extensively in the food and beverage production industry due to their versatility, reliability, and cost-effectiveness.

Q: Which is more powerful pneumatic actuator or hydraulic actuator?

A: Due to the pressure pneumatic systems run at, pneumatic actuators are significantly less powerful than hydraulic actuators, but they do make sense in a variety of applications, including food production, window manufacturing, and vehicle production.

Q: What are the three types of pneumatic actuators?

A: There are several basic types of pneumatic actuator: spring/diaphragm, piston, and rotary vane.

Q: Are pneumatic actuators loud?

A: Generally, most pneumatic actuators produce a low or medium level of noise. However, they can get quite loud if an internal mechanical component is dislodged. Moreover, actuators work at a high intensity on a daily basis, which makes them even more susceptible to wear and tear.

Q: Do pneumatic actuators work by electricity?

A: Pneumatic actuators rely on compressed air or gas as the primary power source. These actuators don't require a motor, but electricity is necessary when paired with an integral solenoid valve which is commonly referred to as a pilot valve. Remote piloting can also be achieved utilizing the air supply port(s).

Q: How much psi does a pneumatic actuator require to work?

A: The most practical pneumatic actuators utilize an air pressure supply of 40 to 120 psi (3 to 8 bar). Generally, they are sized for a supply pressure of 60 to 80 psi (4 to 6 bar).

Q: Are pneumatic actuators fast?

A: Yes. If you have an application where speed is more important than power, then you may consider a pneumatic actuator.

Q: What pressure range is most common for pneumatic actuators?

A: A common standard for pneumatic control valve actuators is 3 to 15 PSI. There are really only two mechanical adjustments that need to be made when coupling a pneumatic diaphragm actuator to a sliding-stem valve: the stem connector and the spring adjuster.

Q: What pneumatic actuator converts compressed air flow?

A: A pneumatic control valve actuator converts energy (typically in the form of compressed air) into mechanical motion. The motion can be rotary or linear, depending on the type of actuator.

Q: What is the difference between a pneumatic actuator and a hydraulic actuator?

A: While hydraulic actuators are prone to leakages, involve high initial investment and maintenance, and make a workspace dirty and cause accidents, pneumatic actuators offer limited strength and work capacity and have a shorter life cycle.

Q: Are pneumatic actuators explosion proof?

A: Pneumatic actuators are an excellent choice for hazardous environments. We can also mount an explosion proof air pilot solenoid valve in any voltage, making the entire package explosion proof.

Q: How do you size a pneumatic actuator?

A: When sizing an actuator, first consider your valve's torque requirements. This includes: Break torque, or opening torque, refers to the force required to start moving a closed valve. Running torque, or mid-stroke torque, is the force required to maintain movement of the valve between the open and closed positions.

Q: How precise are pneumatic actuators?

A: While pneumatic actuators are known for providing high force at fast speeds, they often lack accuracy — at least compared to electric actuators.

Q: Why is hydraulics usually slower than pneumatic actuators?

A: Water and hydraulic oil have a much greater resistance than air, with the viscosity of oil making it much slower. Although it will ultimately develop a greater degree of force and maintain constant pressure, it does not have the same rapidity as air movement, and may take longer to get your system running.

Q: How do you calculate the speed of a pneumatic actuator?

A: How to calculate pneumatic cylinder speed? The velocity of the pneumatic cylinder is given by V = 28.8×Q/A, where V is the pneumatic cylinder velocity (in/s), Q is the volumetric flow rate (CFM), and A is the piston area (square inches).

Q: What is the limitation of pneumatic actuators?

A: Pneumatic actuators must be sized for a specific job in order to be efficient. This requires proportional sized valves, regulators, and compressors which raises the cost and complexity. The air can be contaminated by oil or lubrication, leading to downtime and maintenance.

We're known as one of the most professional pneumatic actuator manufacturers and suppliers in China, providing high quality products with competitive price. Please be free to buy durable pneumatic actuator in stock here from our factory. For pricelist and quotation, contact us.

Spring Return Three Position Pneumatic Actuator, Pneumatic Cylinder, Pneumatic Actuator With Declutchable Gear

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