Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1980-03-11
1982-04-06
Weakley, Harold W.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
13750515, 13750525, F16K 3114
Patent
active
043230865
ABSTRACT:
Pressure responsive flow control apparatus for connection between a source of emergency breathing gas and a hood adapted to fit about a wearer's head for receiving the breathing gas at a controlled flow for inhalation and for receiving the exhalations of the wearer. The flow control apparatus includes a pressure regulating valve operative to maintain a substantially constant discharge pressure to the hood despite progressively decreasing source pressure. Further included is a flow control valve operative against a bias force, and responsive to source pressure, to control gas flow to the hood, the bias force being effective to move the flow control valve such that the rate of gas flow increases with diminishing source pressure thereby to compensate for increased concentration of carbon dioxide in the hood resulting from cumulative exhalations of the wearer.
REFERENCES:
patent: 1408923 (1922-03-01), Bastian
patent: 3425442 (1969-02-01), Johnson
patent: 3995656 (1976-12-01), Mills
Robertshaw Controls Company
Weakley Harold W.
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