What device is used to control the direction of airflow in a pneumatic system?

The device used to control the direction of airflow in a pneumatic system is a directional control valve. This component is essential in directing the compressed air to different parts of the system, effectively determining the operation of actuators, such as cylinders and motors. By shifting the position of the valve, the flow path of the air can be changed, allowing for precise control over the motion and function of pneumatic equipment.

Directional control valves can be operated manually, electrically, or pneumatically, and they come in various configurations, such as two-way, three-way, and four-way valves, depending on the specific application needs. Their primary role in any pneumatic setup is to facilitate changes in airflow direction, contributing to the overall efficiency and functionality of the system.

Filters, regulators, and actuators serve different functions—filters clean the compressed air, regulators control the pressure, and actuators perform the mechanical work—but none of these components can direct the airflow as effectively as a directional control valve can.