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What are the classifications of valve positioners?
Release time:
2026-04-07 15:22
What are the classifications of valve positioners? The following section provides a detailed introduction.
Based on the direction of action, valve positioners can be classified as unidirectional or bidirectional. A unidirectional valve positioner is used with piston-type actuators and operates in only one direction, whereas a bidirectional valve positioner acts on both sides of the cylinder in a piston-type actuator, providing control in two directions.
Valve positioners are classified as direct-acting or reverse-acting based on the sign of the gain between their output and input signals. In a direct-acting valve positioner, an increase in the input signal results in an increase in the output signal, yielding a positive gain. In a reverse-acting valve positioner, an increase in the input signal leads to a decrease in the output signal, resulting in a negative gain.
Based on whether the valve positioner’s input signal is analog or digital, valve positioners can be classified as conventional valve positioners and fieldbus electric valve positioners. Conventional valve positioners accept analog pneumatic, current, or voltage signals as inputs, whereas fieldbus electric valve positioners accept digital signals from the fieldbus as inputs.
Valve positioners can be classified into conventional electric valve positioners and smart electric valve positioners based on whether they are equipped with a CPU. Conventional electric valve positioners do not have a CPU; therefore, they lack intelligence and cannot perform intelligent computations. Smart electric valve positioners, by contrast, are equipped with a CPU and can carry out such intelligent operations as nonlinear compensation in the forward path. Fieldbus-enabled electric valve positioners can further incorporate function modules such as PID control to implement corresponding computational tasks.
2020-01-19
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