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Working Principle and Fault Analysis of Pneumatic Control Valve


Release time:

2021-06-30

Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. Pneumatic control valves are usually formed by pneumatic actuators, valves, positioners and other connecting devices after debugging. Pneumatic control valve is to use compressed air as the power source, the cylinder as the actuator, and with the help of electric valve positioner, converter, solenoid valve, holding valve and other accessories to drive the valve to complete the switch or proportional adjustment, pneumatic control valve receives the control signal of industrial active control system to complete the adjustment of pipeline medium flow, pressure, temperature and other process parameters.

Working Principle and Fault Analysis of Pneumatic Control Valve

Overview of pneumatic control valve
Pneumatic control valve is one of the industrial process control instruments widely used in petroleum, chemical, electric power, metallurgy and other industrial enterprises. Pneumatic control valves are usually formed by pneumatic actuators, valves, positioners and other connecting devices after debugging. Pneumatic control valve is to use compressed air as the power source, the cylinder as the actuator, and with the help of electric valve positioner, converter, solenoid valve, holding valve and other accessories to drive the valve to complete the switch or proportional adjustment, pneumatic control valve receives the control signal of industrial active control system to complete the adjustment of pipeline medium flow, pressure, temperature and other process parameters.
working principle of pneumatic control valve:
Pneumatic control valve is to use compressed air as the power source, the cylinder as the actuator, and with the help of electric valve positioner, converter, solenoid valve, holding valve and other accessories to drive the valve, complete the switch or proportional adjustment, accept the control signal of the industrial active control system to complete the conditioning pipeline medium: flow, pressure, temperature and other process parameters.
Pneumatic control valve is usually composed of pneumatic actuator and conditioning valve connection device debugging. Pneumatic actuator can be divided into single effect type and double effect type. Single effect actuator has reset spring, while double effect actuator has no reset spring. Among them, the single-effect actuator can actively return to the open or closed state of the valve initially set when the source is lost or suddenly faulty.
Pneumatic control valve is divided into two types: gas-open type and gas-closed type, namely the so-called normally open type and normally closed type. The gas-open or gas-close of pneumatic control valve is usually completed by the positive and negative effects of the actuator and the different assembly methods of the valve state structure.