What is the primary function of the Negative Pressure Relief Valves?

The primary function of Negative Pressure Relief Valves is to prevent structural damage to the aircraft. These valves are essential components in the pressurization system that help maintain the integrity of the aircraft’s structure. When the cabin is being depressurized, these valves ensure that there’s not an excessive negative pressure differential between the inside of the cabin and the outside atmosphere. This pressure differential can lead to structural deformation or failure, especially during rapid descent or when transitioning between different flight environments. By allowing ambient air to enter the cabin at a controlled rate, the negative pressure relief valves safeguard the aircraft’s structure from the harmful effects of extreme pressure changes.