What is a primary indicator of proper operation for the 90AF-8 refueling control valve?

The primary indicator of proper operation for the 90AF-8 refueling control valve is the comparison of inlet and cover chamber pressures. This comparison is essential because it ensures that the valve is functioning correctly within its designed parameters. When the pressures in the inlet and the cover chamber are appropriately aligned, it indicates that the valve is opening and closing as required, maintaining proper flow and preventing issues such as overpressure or cavitation.

Incorrect pressure readings at the outlet may indicate downstream issues rather than the operational state of the valve itself. Keeping inlet pressure stable is important for overall system function but does not specifically indicate the valve’s operational integrity. Flow rate consistency also plays a role in system performance, but it can be influenced by various factors unrelated to the valve's internal conditions. Thus, the comparison of inlet and cover chamber pressures provides the most direct and reliable indication of whether the 90AF-8 refueling control valve is operating properly.