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Single-acting pneumatic actuators are a type of actuator commonly used in industrial automation systems. Its working principle is based on the principle of pneumatics, which enables power transmission and control through the force of compressed air. This actuator usually consists of components such as cylinders, pistons, springs, and piston rods. In its design, the piston is only subjected to the unidirectional action of the air pressure, hence the name single-acting pneumatic actuator.
Single-acting pneumatic actuator opens the valve in the case of ventilation, and automatically closes without ventilating the source, and the single-acting pneumatic actuator automatically resets by spring, which is generally used more in dangerous working conditions, and conveys combustible gas or combustible liquid, and when there is an emergency when the gas source is lost, the single-acting pneumatic actuator can automatically reset to minimize the danger .
Single-acting pneumatic actuators are generally divided into normally open type and normally closed type
Normally open type: ventilation is turned off, and the air is turned off
Normally closed, ventilated open
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Air pressure |
2.5bar~8bar |
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Rotation angle |
0° to 90°. Adjustable +5° to -5° |
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Type |
Single acting (spring return) |
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Ambient temperature |
-20 ~ +80° C |
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Optional accessories |
Air regulator, Solenoid valve, Limit switch box |
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Surface material |
Hard anodized |
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Lubrication |
All the moving parts are coated with lubricants, extending service life |
| Air to port A forces the pistons outward, causing the springs to compress, The pinion turns counter clockwise while air is being exhausted from port B. | Loss of air pressure on port A, the stared energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A. |
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Air to port A forces the pistons outward, causing the springs to compress. The pinion turns counterclockwise while air is being exhausted from port B. |
Loss of air pressure on port A. the stored energy in the springs forces the pistons inwards. The pinion turns clockwise while air is being exhausted from port A. |
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