demand regulator

demand regulator

[də′mand ‚reg·yə‚lād·ər]
(engineering)
A component of an open-circuit diving system that permits the diver to expel used air directly into the water without rebreathing exhaled carbon dioxide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Individual crew members are supplied with oxygen under the control of a demand regulator which ensures that breathing gas is delivered in response to inhalation demand -- at a slight positive pressure relative to the cabin's.

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