If the cover chamber pressure on a 90AF-8 refueling control valve is between the inlet and outlet pressure, what action occurs?

When the cover chamber pressure of a 90AF-8 refueling control valve is between the inlet and outlet pressures, the valve modulates. This behavior occurs because the control valve is designed to maintain optimal performance and balance between the flow conditions.

In this scenario, as the cover chamber pressure falls between inlet and outlet pressures, it indicates that the flow demand is changing, and the valve needs to adjust accordingly. Instead of fully opening or closing, which would create abrupt changes in flow and could potentially disrupt system pressure, the valve modulates its position. This modulation allows for a gradual adjustment to maintain desired flow rates and pressures without causing extreme pressure fluctuations or surges in the system.

Understanding this modulation process is essential for maintaining efficient fuel transfer and ensuring the safety and reliability of the refueling operation, as it helps in adapting to varying conditions while keeping the system stable.