Скачать или смотреть Flutter Valve Function

Flutter valves are safety backup in case of massive, forced inspiration deflating the bag. During normal ventilation, positive pressure outflow, and bag reserve volume to prevent negative pressure isolate the user. The bag deflates slightly to supply additional respiratory volume without creating a negative pressure gradient. However, a forceful, rapid, massive inspiration can deflate bag excessively and create a small negative pressure. If this happens, we want our valves to close. Valve closure is not needed during normal breathing, but we have them to mitigate risk from misuse.
Valves should be made using a glove finger tip that is relatively wrinkle free. Large creases at finger tip prevent proper closure.

If given a choice of thicker or thinner gloves, select the thinner glove. Thinner material creates a more responsive flutter valve.

Longer glove fingers are preferred to create a floppier, more responsive valve.