The principle and classification of pneumatic control valves

2026-03-16

Pneumatic control valve working principle

Pneumatic control valve is refers to air as power and cylinder as actuator,
4 ~ 20 ma signals as the drive, and by means of electric valve positioner, converters, solenoid valve, a valve such as attachments to drive the valve, valve is a linear or equal percentage flow characteristics do adjust action, so as to achieve to the pipeline medium flow rate, pressure, temperature and other process parameters or switches Proportional adjustment. Pneumatic control valve has the advantages of simple control, rapid response, and essential safety, and used in flammable and explosive occasions, do not need to take explosion-proof measures in addition.

Working principle of pneumatic control valve: pneumatic control valve is usually composed of pneumatic actuator and regulating valve connection installation and debugging, pneumatic actuator can be divided into single acting and double acting two, single acting actuator with a reset spring, and there is no reset spring in the double acting actuator. The single acting actuator can automatically return to the initial open or closed state of the valve in case of loss of air source or failure.

The classification of pneumatic control valves

Pneumatic control valve according to the form of action is divided into two types of air open type and air close type, namely the so-called normally closed type and normally open type, pneumatic control valve air open or gas close, usually through the positive and negative action of the actuator and valve state structure of different assembly.

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Air open type (normally closed type) Reverse Acting 气开型(常闭型)反作用		Air open type (normally closed type) is when the air pressure on the membrane head increases, the valve moves in the direction of increasing the opening, when the input pressure reaches the upper limit, the valve is in a fully open state. Conversely, when the air pressure decreases, the valve moves in the direction of closing, and when there is no air input, the valve is fully closed. Usually we call the air - open valve for the fault - closed valve.
Air close type (normally open type) Direct Acting 气关型(常开型)正作用		The direction of action of the air closed type (normally open type) is just opposite to the air open type. When the air pressure increases, the valve to close the direction of action; When the air pressure is reduced or not, the valve is opened to the direction or fully opened. Usually we call the gas - off valve for the fault - open valve.

The photo of air to open type pneumatic control valve

The photos of air to close type pneumatic control valve

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The principle and classification of pneumatic control valves

The principle and classification of pneumatic control valves