When does the demand valve of the diluter demand oxygen regulator operate?

The demand valve of the diluter demand oxygen regulator operates specifically in response to the user’s inhalation efforts. This mechanism is designed to provide a flow of oxygen only when the user inhales, ensuring that oxygen is delivered on demand, which conserves the supply and reduces waste.

When a user inhales, the negative pressure created activates the demand valve, allowing oxygen to flow into the mask or other delivery system, matching the user's breath. This system is particularly beneficial because it adapts to the user's varying oxygen needs and provides an efficient means of oxygen delivery, particularly in environments where altitude and related physiological demands change rapidly.

In alternative scenarios, such as when the oxygen supply is depleted or at specific altitudes, the demand valve either wouldn't operate or would not be the mechanism primarily to provide oxygen. The oxygen delivery system is designed to respond to the physiological need for oxygen based on the breathing effort, rather than simply on surrounding conditions or supply status.