What function does the solenoid perform in the 302AF fueling and defueling valve?

In the context of the 302AF fueling and defueling valve, the solenoid plays a vital role, specifically in controlling the defuel side of the valve. When energized, the solenoid acts to close off the defuel side of the main valve inlet, preventing any fuel from flowing back or being released during the fueling process. This is crucial for maintaining proper system pressure and ensuring that the fuel is directed exactly where it is needed without leaks or losses.

The other functions mentioned do not accurately represent the role of the solenoid in this system. Monitoring differential pressure (first option) is not a function of the solenoid itself but may involve other components or sensors in the fuel system. Likewise, the solenoid does not open the fueling side upon receiving pressure (third option) — that is managed by other mechanical or electronic systems. Finally, redirecting flow (fourth option) is a broader function that does not specifically describe the solenoid’s task regarding maintaining proper control of the defuel side of the valve. The specific closing action performed by the solenoid is crucial for the safe and efficient operation of the fueling and defueling system.