| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure reducing device for a half-closed self-respiratory diving unit optimal for a constant mass flow type half-closed self-respiratory diving unit capable of accurately obtaining stable secondary pressure uninfluenced by residual gas pressure. SOLUTION: In this half-closed self-respiratory diving unit having a respiratory system including a gas tank D, a respiratory bag B and a carbon dioxide absorbing device E, a one-stage part pressure adjuster F and a two-stage part pressure adjuster G are connected in series to the delivery side of the gas tank D.
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