These thermal fuses connect to patients’ oxygen tank hoses and don’t restrict oxygen flow. However, when exposed to heat, the valve shuts down the oxygen flow, keeping the oxygen tank from ...

The oxygen tank was empty and its flow valve was open, Pudwill told the board. He said the investigators can't tell whether he tank was used up during the flight or was empty at takeoff.

A heart valve allows blood to flow through the heart in the right direction. One of these valves is known as the aortic valve. It is the final valve that oxygen-rich blood will pass through before ...