Pneumatic Actuator Technical Specification
1. Basic Structure and Core Components
- The actuator consists of several essential parts working together
- A cylinder forms the main body, housing a piston that moves back and forth
- On one side of the piston, a set of springs are installed, providing restoring force
- Air inlets connect to the cylinder, allowing compressed air to enter specific chambers
- Seals and O-rings prevent air leakage, ensuring efficient operation
- These components work in harmony to convert pneumatic energy into mechanical motion
2. Pneumatic Actuation Process
- When compressed air enters the actuator through the supply port, it fills the chamber on one side of the piston
- The increasing air pressure pushes the piston, causing it to move against the resistance of the springs
- As the piston moves, it rotates the connected valve stem or drives linear motion, depending on the actuator type
- This movement opens or closes the valve, controlling the flow of media in the pipeline system
3. Spring Return Mechanism
- When the supply of compressed air is stopped, the pressure in the actuating chamber decreases
- The springs, which were compressed during the actuation phase, begin to expand
- Their stored energy pushes the piston back to its original position
- This return movement reverses the valve's position, closing or opening it depending on the initial setup
- The spring force ensures reliable reset even when air pressure is lost, providing a fail-safe function
4. Integration with Valve Operation
- The actuator connects to valves through a coupling or adapter
- As the piston moves, it rotates or shifts the valve's internal components (ball, disc, or plug)
- The direction of movement determines whether the valve opens or closes under normal and failure conditions
- This integration allows for automated control of fluid flow
- The spring ensures safe valve positioning when air supply is interrupted
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