A pneumatic valve is a component that controls the airflow within a pneumatic system. It is used to start, stop, or regulate the movement of compressed air, allowing for the control of pneumatic cylinders, tools, and other devices powered by air pressure.

There are several types of pneumatic valves, including 2/2, 3/2, 4/2, and 5/2 valves. The numbers indicate the number of ports and positions the valve has, which determines how it directs airflow. Other common types include pressure regulation valves, directional control valves, and flow control valves, all of which serve different control functions within a system.

The selection of a pneumatic valve depends on system requirements such as flow capacity, pressure, connection type, and function. To choose the right valve, it is essential to consider the application and the specific control features needed, such as whether the valve should regulate direction, pressure, or flow rate.