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Differences Between Intelligent Valve Positioners and Conventional Valve Positioners
Release time:
2026-04-07 15:22
The differences between intelligent valve positioners and conventional valve positioners can be summarized in the following three points:
1. The methods for implementing the flow characteristics of control valves differ.
The feedback section of the smart positioner employs linear feedback, with the desired flow characteristic of the control valve being realized within the setpoint loop. In contrast, the feedback section of a conventional positioner consists of cams of various shapes, and the desired flow characteristic is achieved by varying the cam profile.
2. Different input and output methods.
Typically, an intelligent valve positioner is an intelligent electro-pneumatic valve positioner. Compared with a conventional electro-pneumatic valve positioner, the input signal of an intelligent electro-pneumatic valve positioner is a standard 4–20 mA or 1–5 V electrical signal, which must first undergo analog-to-digital conversion before being fed as the microprocessor’s input. In contrast, although the input signal of a conventional electro-pneumatic valve positioner is also 4–20 mA or 1–5 V, it does not require analog-to-digital conversion; instead, it can be directly applied to the solenoid coil to generate electromagnetic force, thereby achieving force balance. The output signal of an intelligent valve positioner is a digital signal, which is typically sent to a piezoelectric valve assembly. By switching the piezoelectric valves, the air pressure supplied to the control valve diaphragm chamber is regulated. By contrast, the output signal of a conventional electro-pneumatic valve positioner is a pneumatic signal that has been amplified by a pneumatic amplifier.
3. The control methods employed differ.
Smart valve positioners, like conventional computer-controlled devices, employ discrete control, meaning that the control valve opening remains constant during each sampling interval. As a result, the valve opening exhibits step-like changes during operation. In contrast, conventional valve positioners use continuous control, so the valve opening varies continuously throughout the entire control process—except for abrupt jumps caused by the dead zone.
2020-01-19
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