Air pilot valve
An air pilot valve switches or vents pneumatic control air for equipment such as an actuator and is not necessarily the main process-fluid valve. This pilot duty distinguishes it from a process solenoid. Port count, capacity, air pressure, de-energized state, and mounting method must follow the actual control circuit; no NAMUR or other interface follows from the name.
Application and duty
Pneumatic piloting of an actuator or auxiliary circuit with confirmed port arrangement