What is the primary function of a pilot valve in a pneumatic system?

The primary function of a pilot valve in a pneumatic system is to control larger flow valves using a smaller input signal. This type of valve acts as an intermediary that utilizes a small input pressure or flow to control a larger flow or pressure in the system. When a pilot valve is activated, it directs the airflow to a larger valve, enabling the efficient operation of systems that require substantial force or flow with only a minimal controlling input. This capability is essential in applications where precise control is needed without the need for significant power or large actuators for every valve.

This design not only ensures a more compact and efficient system but also enhances responsiveness and reliability while reducing energy consumption. Other options, such as measuring pressure levels, filtering contaminants, or providing backup pressure, are not the primary roles of a pilot valve, making them less relevant in the context of its fundamental purpose.