Electrical valve positioners are indispensable in improving process control accuracy and reliability. Selection needs to consider the process requirements and equipment characteristics, and the popularity of intelligent positioners is promoting industrial automation to a higher level of intelligence.
the working principle
Input signal processing
After the locator receives the current signal, the internal circuit or microprocessor analyzes the target opening value.
Position feedback and comparison
Mechanical feedback: through the CAM, connecting rod and other mechanisms to convert the valve stem displacement into a mechanical signal.
Digital feedback: The intelligent positioner obtains real-time position signals through potentiometers or magnetostrictive sensors and compares them with set values.
Output regulation
Traditional positioner: Using the principle of force balance, through the baffle nozzle system to adjust the output pressure.
Intelligent positioner: Precisely control the gas path through piezoelectric valves or high-speed solenoid valves to drive the actuator.
Closed loop control
Continuously compare the set value to the actual position and dynamically adjust the output until the error is eliminated.
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