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Basic Knowledge of Valve Positioners
Release time:
2026-04-07 15:22
Valve positioners come in a wide variety of designs, including pneumatic, electric, and smart models. Typically, the control valve is the most critical accessory for such positioners, as they are generally used in conjunction with pneumatic control valves. The positioner receives the output signal from the controller and uses this signal to regulate and operate the valve. Once the control valve is in operation, various feedback mechanisms can transmit information back to the valve positioner, which then reports this data to the higher-level control system.
At the same time, it can also be used to enhance the output efficiency of the control valve, thereby reducing the lag that occurs during the transmission of control signals and accelerating the valve’s response. This improves the valve’s linearity and sensitivity, mitigating the effects of friction and unbalanced forces, and ensures the proper operation of the control valve. It is thus evident that without additional accessories, the positioner would find it difficult to achieve this sequence of functions and performance.
The positioner is a critically important component for controlling the valve; therefore, if the signal output by the controller is to be used as a setpoint signal, a comparison can generally be made. When there is a deviation between the two signals, the output signals of the controller and the positioner can be adjusted to actuate the control mechanism, thereby establishing a corresponding relationship that enables each to more accurately determine the other’s position and function.
2020-01-19
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