Vent valve apparatus
First Claim
1. A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus includes a gas washout vent defined by an orifice having the shape of an outwardly diverging truncated cone, a vent valve having the shape of a cone shaped plug complimentary to the shape of the washout vent, the vent valve adapted to progressively restrict the flow area of the washout vent, and a pressure sensitive vent valve control means adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and or CO2 through the washout vent over a range of gas supply pressures.
3 Assignments
0 Petitions
Accused Products
Abstract
A vent valve apparatus (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal. The apparatus (10) includes a gas washout vent (15), a vent valve (18) adapted to progressively restrict the flow area of the washout vent (15), and a pressure sensitive vent valve control means (20,22,23). The control means is adapted to progressively cause the vent valve (18) to restrict the flow area of the gas washout vent (15) in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and/or CO2 gas through the washout vent (15) over a range of gas supply pressures.
354 Citations
20 Claims
- 1. A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus includes a gas washout vent defined by an orifice having the shape of an outwardly diverging truncated cone, a vent valve having the shape of a cone shaped plug complimentary to the shape of the washout vent, the vent valve adapted to progressively restrict the flow area of the washout vent, and a pressure sensitive vent valve control means adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and or CO2 through the washout vent over a range of gas supply pressures.
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5. A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus comprising:
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a gas washout vent; a vent valve adapted to progressively restrict the flow area of the washout vent; a pressure sensitive vent valve control means, including an elastic diaphragm, produced from a rubber or other elastic diaphragm stretched over a circular orifice, connected to the vent valve such that displacement of the diaphragm results in displacement of the vent valve, adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and or CO2 through the washout vent over a range of gas supply pressures; and means for connecting the vent valve to the rubber diaphragm to allow for the stroke of the vent valve to be adjusted. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus comprising:
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a gas washout vent; a vent valve adapted to progressively restrict the flow area of the washout vent; and a pressure sensitive vent valve control means adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, said vent valve control means including an aerodynamic member suspended in a branch of the conduit and adapted for rotation about an axis transverse to the branch, thereby substantially regulating the volumetric flow of gas and/or CO2 through the washout vent over a range of gas supply pressures. - View Dependent Claims (12)
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13. A vent valve apparatus for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus comprising:
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a gas washout vent; a vent valve adapted to progressively restrict the flow area of the washout vent; and a pressure sensitive vent valve control means adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, said vent valve control means including an aerodynamic member disposed in the air supply conduit by a biased pivot mechanism and having an axis of rotation transverse to the direction of gas flow whereby gas passing through the conduit causes the aerodynamic member to generate lift and to be rotatably displaced in proportion to the velocity of the gas flowing through the conduit thereby substantially regulating the volumetric flow of gas and/or CO2 through the washout vent over a range of gas supply pressures. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification