Aluminum Pneumatic Actuator and its control system: industrial power with precise control

1. Overview of Aluminum Pneumatic Actuator
Aluminum Pneumatic Actuator uses compressed air as the power source, and converts air pressure energy into mechanical energy through internal mechanical structure conversion, driving the valve stem to perform linear motion or rotational motion, thereby achieving precise control of the valve opening. Compared with electric actuators, pneumatic actuators have the advantages of simple structure, convenient maintenance, good explosion-proof performance, and strong ability to adapt to harsh environments, especially in extreme working conditions such as flammable and explosive, high temperature and high pressure.

2. Positioner control system: precise positioning to meet process requirements
As the "brain" of the pneumatic actuator, the core function of the positioner is to accurately adjust the output stroke of the actuator or the opening of the valve according to the external input signal (such as 4-20mA current signal or 0.2-1.0MPa air pressure signal). This process involves the reception, processing, conversion and feedback of signals to ensure that the actuator moves quickly, accurately and stably.

Signal reception and processing: The positioner has a built-in high-sensitivity sensor that can capture changes in input signals in real time, and analyze and calculate through the built-in microprocessor to determine the target position.
Precise control: Through the built-in adjustment mechanism, such as a proportional solenoid valve or a stepper motor, the positioner can continuously adjust the air pressure entering the actuator to achieve fine control of the actuator output stroke.
Feedback mechanism: The positioner is usually equipped with a position feedback device (such as a displacement sensor) to monitor the actual position of the actuator in real time and compare it with the target position. The deviation is continuously corrected through a closed-loop control algorithm to ensure positioning accuracy.
Parameter adjustment: Users can adjust parameters such as sensitivity, dead zone, and stroke limit through the operation interface or remote communication interface on the positioner according to specific process requirements to meet the needs of different application scenarios.
3. Solenoid valve control system: flexible control of air source on and off
As the air path control element of the pneumatic actuator, the solenoid valve controls the supply and cutoff of compressed air, which directly determines whether the actuator can move and the direction of the movement.

Single-electric solenoid valve: This type of solenoid valve has a simple structure and low cost, and is suitable for occasions where control accuracy is not required. Its working principle is that when the power is on, the electromagnet inside the solenoid valve attracts the iron core to open or close the gas circuit; when the power is off, the current state remains unchanged due to the action of the spring.
Double-sole solenoid valve: Compared with single-sole solenoid valve, double-sole solenoid valve has higher control flexibility and reliability. It contains two independent coils, one coil opens the gas circuit when it is energized, and the other coil closes the gas circuit when it is energized, realizing two-way independent control of the gas circuit. This design is particularly suitable for occasions where the actuator state needs to be switched quickly, such as emergency shutdown or rapid response systems.