What is a pneumatic valve? What is an air shutoff valve? What are their respective functions?

Pneumatic valve opening: compressed air is needed to open the valve, and the valve is closed after the gas is cut off.

Cut-off valve: compressed air is needed to close the valve, and the valve will open after cutting off the gas.

Air-opened valve refers to the control valve, code FC. When the air pressure signal input to the valve increases, the opening of the control valve is increased, and when the air pressure signal is not input, the valve is closed. When the instrument air is interrupted, the valve is closed.

Generally speaking, the so-called air-opening regulating valve is to open when there is air and close when there is no air, that is, to open when there is no air and no electricity. The selection of gas opening and gas closing is completely based on the process safety setting.

Extended data:

The regulating valve is used to regulate the flow, pressure and liquid level of the medium. According to the signal of adjusting position, the opening of the valve is automatically controlled, so as to adjust the medium flow, pressure and liquid level. Regulating valves are divided into electric regulating valves, pneumatic regulating valves and hydraulic regulating valves.

The regulating valve is composed of electric actuator or pneumatic actuator and regulating valve. Regulating valves are usually divided into straight-through single-seat regulating valves and straight-through double-seat regulating valves. The latter has the characteristics of large circulation capacity, small imbalance and stable operation, and is usually especially suitable for occasions with large flow, high pressure drop and less leakage.

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