What does a directional control valve do in a pneumatic system?

A directional control valve is a critical component in a pneumatic system because it determines the path of airflow, which is essential for actuating various components such as cylinders or motors. By controlling how compressed air flows through the system, the valve can either allow air to enter a particular component or redirect the flow away from it. This functionality enables precise control over the operation of machinery and automation processes. The ability of the valve to selectively direct flow helps achieve different actions—for example, extending or retracting a cylinder—depending on the desired operation of the system.

The other options do not accurately describe the primary function of a directional control valve; they pertain to different aspects of pneumatic or fluid control systems.