| 摘要 |
A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal includes a gas washout vent, a vent valve adapted to progressively restrict the flow area of the washout vent, and a pressure sensitive vent valve controller. The controller is adapted to progressively cause the vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply. Thereby, the vent valve substantially regulates the flow of gas through the washout vent over a range of gas supply pressures.
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