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The control valve is an indispensable actuator in the process control system. It drives the actuator to change the flow area between the valve core and the valve seat, thereby achieving precise and continuous regulation of parameters such as the flow rate, pressure, temperature and liquid level of the medium in the pipeline. It features precise control, rapid response, stable operation and high degree of automation, and is widely used in the automatic control of gas, liquid and steam media in industrial fields such as petroleum, chemical engineering, power and metallurgy.