Pneumatic gate valves use Compressed air as their power source, cylinders as their actuators, and accessories such as electrical valve locators, converters, solenoid valves, and positioner valves to drive the valves, the pneumatic gate valve realizes the on-off or proportional regulation, receives the control signal from the industrial automation control system to adjust the flow rate, pressure, temperature and other process parameters of the pipeline medium. Pneumatic gate valve is characterized by simple control, rapid response, and the essence of safety, no need to take additional explosion-proof measures.

Pneumatic gate valve action is divided into gas-open type and gas-close type two. Air-opening is when the air pressure on the head increases, pneumatic gate valve to increase the opening direction action, when the upper limit of input pressure, the valve is in full open state. Conversely, when the air pressure is reduced, the valve to the closed direction of action, in the absence of air input, the valve is fully closed. So sometimes gas-open type valve also known as fault-closed type. The air-off action direction is just opposite to the air-opening type. When air pressure increases, the pneumatic gate valve moves in the closed direction; when air pressure decreases or is absent, the valve moves in the open direction or is fully open. So sometimes also known as fault-open type. The air opening or closing of the pneumatic control valve is usually realized by the positive and negative action of the actuator and the different assembly modes of the valve state structure.

The choice of gas switch is based on the process of production safety point of view to consider. When the air supply is cut off, is the pneumatic gate valve safe in the closed position or the open position? For example, in a furnace combustion control, the control valve is installed in the fuel gas pipeline to control the supply of fuel according to the temperature of the furnace or the temperature of the heated material at the outlet of the furnace. It is safer to use an air-operated valve, since it is more suitable to close the valve than to open it fully once the air supply has ceased. If the air supply is interrupted and the fuel valve is fully open, there is a danger of overheating. Another example of a cooling water-cooled heat exchange equipment, the heat material in the heat exchanger and cooling water heat exchange is cooled, regulating valve installed in the cooling water pipe, with the heat exchange of the material temperature to control the amount of cooling water, when the air supply is interrupted, the pneumatic gate valve should be in an open position to be safer, air-shutoff (that is, Fo) valve should be selected.