Which component primarily controls the flow in a pneumatic system?

In a pneumatic system, the component that primarily controls the flow of compressed air is the valve. Valves are crucial for directing, starting, stopping, and regulating the airflow within the system, effectively managing how and when air is allowed to move through different parts of the circuit. By adjusting the position of the valve, operators can control the passage of air to actuators or other components, thus regulating the system's operation.

While compressors generate the compressed air needed for the system and filters are important for maintaining air quality by removing contaminants, they do not control the flow itself. Actuators, such as cylinders or motors, convert pneumatic energy into mechanical work but rely on valves to determine how and when they receive air. Therefore, the valve is essential for controlling the flow within the pneumatic system.