How much pressure in psi is the type 4 refueling control valve adjusted to maintain pressure at the skin of the aircraft?

The type 4 refueling control valve is specifically designed to maintain a pressure of 45 psi at the skin of the aircraft during refueling operations. This pressure is crucial for ensuring a safe and effective refueling process, as it helps to prevent over-pressurization and ensures that fuel is delivered at the correct rate without causing damage to the aircraft's fuel system. By maintaining this specific pressure, the valve helps to optimize performance and safeguard the integrity of both the refueling system and the aircraft’s structure. Understanding the operational parameters of the refueling control valve is essential for personnel involved in maintenance and safety checks within aviation fuel systems.