The valve positioner is the main accessory of the control valve. It takes the 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, change its output to the actuator The signal causes the actuator to act, establishing a one-to-one correspondence between the valve stem displacement 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.
The main function
Pneumatic valve positioner and pneumatic actuator together constitute an automatic control unit and various regulating valve connections, after debugging and installation, are combined into a pneumatic regulating valve.
Used in various industrial automation process control fields.
The pneumatic valve positioner receives 4-20mA weak current signals from the controller or control system, and sends air signals to the pneumatic actuator for control
Valve position device.
It is used in conjunction with a pneumatic control valve to form a closed loop control loop. The direct current signal given by the control system is converted into a gas signal for driving the regulating valve to control the action of the regulating valve. At the same time, feedback is performed according to the opening of the regulating valve, so that the valve position can be correctly positioned according to the control signal output by the system.
Supporting the use of
It can be used for single-acting (spring return type) and double-acting pneumatic actuators.
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