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Comparative Evaluation of Scott Aviation Inc. Model 3300 Closed Circuit Oxygen Breathing Apparatus with Single and Double Demand Valves.
NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL
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The Scott Aviation closed circuit oxygen underwater breathing apparatus was evaluated to determine the relative merits of single demand valve actuation versus double demand valve actuation of make-up oxygen. No significant improvement is provided through the use of a single demand valve as designed. Excessive breathing bag inflaction develops. The double demand valve requires a means of adjustment to provide a satisfactory actuation level. Author
APPROVED FOR PUBLIC RELEASE