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The regulating valve is also called a pneumatic eccentric rotary valve . By receiving the control signal output from the regulating control unit, the fluid flow is changed by power operation. The regulating valve is generally composed of an actuator and a valve. According to the power used by the corresponding actuator, the regulating valve can be divided into three types: pneumatic regulating valve , electric regulating valve , and hydraulic regulating valve, that is, pneumatic regulating valve using compressed air as the power source and electric using electric power as the power source. Regulating valve, an electro-hydraulic regulating valve powered by the pressure of a liquid medium (such as oil). In addition, according to its functions and characteristics, there are also hydraulic control valves, solenoid valves, electronic, intelligent, fieldbus-type regulating valves Wait.