What effect does atmospheric pressure decreasing have on the differential metering valve?

When atmospheric pressure decreases, the differential metering valve's function is closely linked to the changes in pressure dynamics. Specifically, the metering valve is designed to manage the flow of hydraulic fluid by allowing a specific amount of fluid to pass based on the pressure differential across its boundaries.

As atmospheric pressure decreases, the reference pressure against which the valve operates changes. This pressure differential will cause the valve to open more to maintain adequate flow through the system. By doing so, it helps to reduce the reference pressure and counteract the effects of the decreasing atmospheric pressure. This action ensures that the hydraulic systems continue to function effectively, retaining operational efficiency even as environmental conditions change.

This understanding is crucial for ensuring that the hydraulic systems are responsive to pressure variations, which can occur during flight due to altitude changes or varying atmospheric conditions. The ability of the metering valve to compensate for these pressures ensures stability and reliability in the aircraft systems reliant on hydraulic fluid.