The valve positioner is a device used to automatically control the valve, which can accurately position the valve according to the control signal. The valve positioner usually consists of an electrical converter, a pneumatic actuator, and a position sensor.
The working principle of the valve positioner is that the control signal (such as 4-20mA) is input into the electrical converter, which converts the electrical signal into a gas signal and then passes it to the pneumatic actuator, which controls the opening of the valve according to the size of the gas signal. At the same time, the position sensor of the valve positioner can detect the opening of the valve and feed the detected signal back to the electrical converter to form a closed-loop control system.
The valve positioner module is a control module integrated with the valve positioner, which can convert the control signal to the gas signal and control the opening of the valve. This module usually has the advantages of high precision, fast response, good stability and high reliability, and can be widely used in various fields requiring precise control of valves, such as petrochemical, pharmaceutical, food and so on.
When selecting the valve positioner module, the following factors need to be considered: control signal type, control accuracy and response speed, stability, reliability, etc. At the same time, it is also necessary to pay attention to whether the connection mode and interface type between the valve match.
In short, the valve positioner module is an important industrial control device, which can achieve high precision, fast response, stable and reliable valve control. In the selection need to be selected according to the actual demand, and pay attention to the matching problem between the valve.
