| 摘要 |
There is disclosed an emergency escape breathing apparatus comprising a hood to be placed over a person's head and a pressured bottle supply of air or oxygen enriched air. The hood is formed of thin film, clear plastics in a tent structure having a bottom wall formed of a thin film elastomer. The elastomer film has an aperture of sufficient diameter to permit the hood to be pulled over the wearer's head and yieldably seals about the wearer's neck, functioning as an exhalation valve, maintaining adequate pressure to keep the hood inflated. The device is provided with a valve on the air supply bottle which has a reseatable valve member and two stages of flow control; the first stage being pressure control, providing a variable flow area which increases with declining pressure in the air supply bottle, and the second stage being flow control having a fixed diameter orifice. The reseatable valve member and flow control elements are all combined in a single unitary valve structure.
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