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rg2019-08-19  Դ52tennis.org

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  • According to this definition, the valve and sensors, operators (PLC, DCS or simple regulator) constitute a control loop (whether it is a single loop or multiple loop) to complete the process variable control, it is called the control valve. Therefore, pneumatic, electric, hydraulic valves with actuators should be called control valves, including solenoid valves, because they can form a control loop with the control system to complete the active control. Whether they receive switching quantity signal or share signal, the control principle is the same. Manual valves are not control valves. Some valve manufacturers also call the automatic control valve, its definition should be the same as the control valve.

  • (39)
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  • (21)
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