Which component is essential in a pneumatic system for sending signals?

In a pneumatic system, the valve plays a crucial role in controlling the flow and direction of compressed air, thus enabling the signaling component of the system. Valves are responsible for opening and closing passages to direct the airflow to the appropriate actuators or devices. This functionality allows for the control of various operations within the system based on the signals received, making it fundamental for effective communication and action.

While other components such as compressors, air tanks, and filters are important for the overall operation of the pneumatic system, they do not directly handle the signaling aspect. The compressor generates and supplies the compressed air, the air tank stores it, and the filter ensures the air quality is suitable for the system's operation. However, it is the valve that directly responds to control signals, allowing for the actuation of cylinders or other components, which is essential for the system's communication and operational efficiency.