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What is a Pneumatic Actuator?


Release time:

2022-07-06

Today, by Wuxi Xinming automatic control valve industry Co., Ltd. for you to introduce what is the specific pneumatic actuator? Principle, classification, selection of a clear: I. Overview of Pneumatic Actuators Pneumatic actuator is the use of gas pressure to drive the opening and closing of the valve or the implementation of the device, also known as the pneumatic executive organization or pneumatic equipment, but generally known as the pneumatic head. The execution organization and conditioning organization of the pneumatic actuator are the same as the whole, and the execution organization includes membrane type, piston type, fork type and rack and pinion type. The piston stroke is long and is suitable for occasions requiring large thrust; while the diaphragm stroke is small and can only directly drive the valve stem. Fork-type pneumatic actuators have the characteristics of large torque, small space, and torque curve more in line with the torque curve of the valve, but they are not very beautiful; they are commonly used in large torque valves. The rack and pinion pneumatic execution organization has the advantages of simple structure, stable and reliable action, and safety and explosion-proof. It is widely used in the production process with high safety requirements such as power plants, chemical industry and oil refining. The working principle of 2. pneumatic actuators 1. Working principle diagram of double-effect pneumatic actuator When the air source pressure enters the middle cavity between the two pistons of the cylinder from the air port (2), the two pistons are separated and moved in the direction of the two ends of the cylinder. The air in the air chambers of the two ends is discharged through the air port (4), which makes the two pistons rack together. The synchronous drive output shaft (gear) rotates counterclockwise. On the contrary, when the air source pressure enters the air chambers at both ends of the cylinder from the air port (4), the two pistons move towards the center of the cylinder, and the air in the central air chamber is discharged through the air port (2), so that the two piston racks synchronously drive the output shaft (Gear) rotates clockwise. (If the piston is installed in the opposite direction, the output shaft will rotate in the opposite direction.) 2. Single effect pneumatic actuator working principle diagram When the air source pressure enters the middle cavity between the two pistons of the cylinder from the air port (2), the two pistons are separated and moved toward the two ends of the cylinder, forcing the tension springs at both ends to compress, and the air in the two air chambers is discharged through the air port (4), Together, the two piston racks synchronously drive the output shaft (gear) to rotate counterclockwise. After the air source pressure is reversed by the solenoid valve, the two pistons of the cylinder move in the center direction under the elastic force of the tension spring, and the air in the central air chamber is discharged from the air port (2), so that the two piston racks synchronously drive the output shaft (Gear) rotates clockwise. (If the piston is installed in the opposite direction, the output shaft will rotate in the opposite direction when the spring is reset). The above is the part about what is the pneumatic actuator specifically introduced by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions, please feel free to come and consult!

What is a Pneumatic Actuator?

Today, Wuxi Xinming automatic control valve industry co., ltd will give you a specific introduction of what isPneumatic actuator? Principle, classification, type selection once said clearly:


I,Pneumatic actuatorOverview
Pneumatic actuator is the use of gas pressure to drive the opening and closing of the valve or the implementation of the device, also known as the pneumatic executive organization or pneumatic equipment, but generally known as the pneumatic head. The execution organization and conditioning organization of the pneumatic actuator are the same as the whole, and the execution organization includes membrane type, piston type, fork type and rack and pinion type.
The piston stroke is long and is suitable for occasions requiring large thrust; while the diaphragm stroke is small and can only directly drive the valve stem. Fork-type pneumatic actuators have the characteristics of large torque, small space, and torque curve more in line with the torque curve of the valve, but they are not very beautiful; they are commonly used in large torque valves. The rack and pinion pneumatic execution organization has the advantages of simple structure, stable and reliable action, and safety and explosion-proof. It is widely used in the production process with high safety requirements such as power plants, chemical industry and oil refining.
The working principle of 2. pneumatic actuators
1. Working principle diagram of double-effect pneumatic actuator
When the air source pressure enters the middle cavity between the two pistons of the cylinder from the air port (2), the two pistons are separated and moved in the direction of the two ends of the cylinder. The air in the air chambers of the two ends is discharged through the air port (4), which makes the two pistons rack together. The synchronous drive output shaft (gear) rotates counterclockwise. On the contrary, when the air source pressure enters the air chambers at both ends of the cylinder from the air port (4), the two pistons move towards the center of the cylinder, and the air in the central air chamber is discharged through the air port (2), so that the two piston racks synchronously drive the output shaft (Gear) rotates clockwise. (If the piston is installed in the opposite direction, the output shaft will rotate in the opposite direction.)
2. Single effect pneumatic actuator working principle diagram
When the air source pressure enters the middle cavity between the two pistons of the cylinder from the air port (2), the two pistons are separated and moved toward the two ends of the cylinder, forcing the tension springs at both ends to compress, and the air in the two air chambers is discharged through the air port (4), Together, the two piston racks synchronously drive the output shaft (gear) to rotate counterclockwise. After the air source pressure is reversed by the solenoid valve, the two pistons of the cylinder move in the center direction under the elastic force of the tension spring, and the air in the central air chamber is discharged from the air port (2), so that the two piston racks synchronously drive the output shaft (Gear) rotates clockwise. (If the piston is installed in the opposite direction, the output shaft will rotate in the opposite direction when the spring is reset).








The above is the part about what is the pneumatic actuator specifically introduced by Wuxi Xinming automatic control valve industry co., ltd. if you have any questions, please feel free to come and consult!