Explanation of the working principle of valve positioner

Release time:

2024-01-02 09:00

With the development of smart meter technology, microelectronics technology is widely used in traditional meters, greatly improving the functions and performance of meters. The valve positioner is the main accessory of the regulating valve. It is usually used in conjunction with the pneumatic regulating valve. It receives the output signal of the regulator, and then uses its output signal to control the pneumatic regulating valve. When the regulating valve is actuated, the displacement of the valve stem passes through The mechanical device is fed back to the valve positioner, and the valve position status is transmitted to the upper system through electrical signals.

The positioner can be divided into: pneumatic positioner, electric positioner, intelligent positioner according to the working principle

The working principle of electric valve positioner. The electric valve positioner is the main accessory of the control valve. It uses the valve stem displacement signal as the input feedback measurement signal and the controller output signal as the setting signal for comparison. When there is a deviation between the two, the output signal to the actuator is changed to make the actuator act, and the valve is established. The one-to-one correspondence between the rod displacement times and the controller output signal. Therefore, the valve positioner constitutes a feedback control system that uses the displacement of the valve stem as the measurement signal and the output of the controller as the setting signal. The manipulated variable of the control system is the output signal from the valve positioner to the actuator.

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