Which type of oxygen delivery system flows only when the diver inhales?

The type of oxygen delivery system that flows only when the diver inhales is known as a demand system. This system is designed to conserve oxygen by providing it only when the diver is actively breathing. When the diver inhales, a valve opens to allow oxygen to flow, ensuring that the oxygen is delivered efficiently without wasting any during exhalation.

Demand systems are particularly beneficial in scuba diving and emergency situations because they allow the diver to receive supplemental oxygen precisely when needed, without the constant flow that can lead to rapid depletion of oxygen sources. This mechanism is essential for maintaining optimal oxygen levels in situations where breathing may be shallow or irregular.

In contrast, continuous systems deliver oxygen constantly, regardless of the diver's breathing pattern, which can lead to unnecessary consumption of oxygen. Non-rebreather systems provide oxygen and prevent rebreathing exhaled gases but can be less efficient when it comes to matching the delivery of oxygen to the diver's breathing needs. Venturi systems rely on the principle of air mixing with oxygen as the diver breathes and are not solely based on inhalation effort. Understanding these differences is crucial for effective use of oxygen delivery systems in diving scenarios.