What is the function of the inhalation valve in the oxygen mask assembly?

The inhalation valve in the oxygen mask assembly is vital for controlling the flow of oxygen during inhalation. It functions as a one-way valve that opens when the wearer inhales, allowing oxygen from the tank to enter the mask and be delivered to the user. This ensures that the individual receives a pure oxygen supply efficiently, especially in situations where supplemental oxygen is necessary, such as at high altitudes.

During exhalation, the inhalation valve closes, preventing exhaled air from flowing back into the oxygen system, which is essential for maintaining the integrity of the oxygen supply and avoiding the mixing of inhaled oxygen with exhaled carbon dioxide. By precisely controlling the oxygen flow only during inhalation, the inhalation valve enhances the effectiveness of the oxygen mask in maintaining adequate oxygen levels for the wearer.