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A Brief Discussion on the Structure and Classification of Valve Positioners
Release time:
2026-04-07 15:22
Valve positioners can be classified according to their structure into pneumatic valve positioners, electrically operated valve positioners, and intelligent system valve positioners. They are essential accessories for control valves and are typically used in conjunction with pneumatic control valves. The positioner receives the output signal from the control panel and then uses its own output signal to regulate the pneumatic control valve. Once the valve has reached the desired position, any deviation of the valve stem is fed back to the positioner via the process instrumentation, and the valve position is transmitted as an electrical signal to the higher-level supervisory control system.
(1) Structure
Valve positioners can be classified, according to their structural design and operating principles, into pneumatic valve positioners, electro-pneumatic valve positioners, and intelligent system-based valve positioners.
A valve positioner can amplify the output power of the control valve, reduce delays in the transmission of control signals, increase the speed of stem movement, improve the linearity of the shut-off valve, mitigate stem sliding friction, and eliminate damage caused by unbalanced forces, thereby ensuring precise and reliable positioning of the control valve.
(2) Classification of Positioning Devices
1. Valve positioner function-key input data signals are categorized into pneumatic valve positioners, electrically operated valve positioners, and intelligent system valve positioners.
2. Based on the orientation of the mounting position, valve positioners can be classified as single-side and double-side types. A single-side valve positioner is used with piston-type electric actuators and operates in only one direction, whereas a double-side valve positioner acts on both sides of the cylinder of the piston-type electric actuator and thus operates in two directions.
3. Based on the sign of the gain between the valve positioner’s output and input signals, valve positioners are classified as direct-acting or reverse-acting. In a direct-acting valve positioner, an increase in the input signal results in an increase in the output signal, indicating 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.
2020-01-19
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