What type of valve is used to divert air flow in a pneumatic circuit?

A directional control valve is specifically designed to manage the path that compressed air takes through a pneumatic circuit. When the valve is activated, it can change the direction of airflow, allowing it to divert air to specific actuators or components in the system based on the operational requirements. By utilizing various configurations, such as two-position or three-position setups, directional control valves can control both the activation and positioning of pneumatic devices.

In practical applications, these valves are crucial in systems where different actions or process flows need to be managed effectively. For instance, in a double-acting cylinder, the directional control valve can alternate which side of the cylinder receives airflow, facilitating the extension and retraction of the cylinder's rod.

The other types of valves mentioned do not perform the same function. Flow control valves regulate the speed of the airflow but do not change its direction. Pressure relief valves are essential for maintaining safety by preventing excessive pressure within a system but do not direct the flow of air. Check valves allow flow in one direction only, ensuring that backflow does not occur, but they do not control or divert the airflow.