The standard pressure setting on the 503AF-2 pressure valve's pressure relief control is based on the 90AF-8 refueling valve's pressure. How much is it set above normal?

The standard pressure setting on the 503AF-2 pressure valve's pressure relief control being set at 10 psi above the normal inlet pressure (NIP) aligns with operational safety and performance standards. This setting ensures that the pressure relief function on the 503AF-2 valve can effectively prevent backflow and over-pressurization in the system, which is crucial for maintaining controlled refueling operations.

Setting the pressure relief 10 psi above the NIP accommodates variations in system pressure that may occur during operation. By establishing this buffer, the valve can operate safely without inadvertently triggering the release mechanism under regular operating conditions, thus ensuring the integrity of the refueling operation.

Choosing this specific setting provides a reliable margin that enhances the performance of both the 503AF-2 pressure valve and the 90AF-8 refueling valve, facilitating a smooth and safe refueling process while adhering to industry standards for pressure control in fuel systems.