Open circuit emergency breathing apparatus and pressure demand valve therefor
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United States of America Patent
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-
Nov 20, 1990
Grant Date -
N/A
app pub date -
Nov 3, 1987
filing date -
Nov 3, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Open circuit emergency breathing apparatus is disclosed which includes a pressure demand valve selectively connectable to primary and secondary sources of breathing gas under pressure to direct breathing gas to a breathing hose attached to the valve and then to a face mask worn by a user of the apparatus. The pressure demand valve includes a diaphragm actuated flow control member and a tubular breathing gas sensor operable in response to inhaling and exhaling by the user to control displacements of the diaphragm and corresponding displacements of the flow control member in a manner which enables obtaining and maintaining the flow of appropriate volumes of breathing gas to the user of a wide range of low to high breathing rates and a wide range of breathing gas supply pressures.
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