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Devices for controlling gas flows

  • US 4,336,590 A
  • Filed: 05/01/1980
  • Issued: 06/22/1982
  • Est. Priority Date: 05/02/1979
  • Status: Expired due to Term
First Claim
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1. In a transportation aircraft, an apparatus for distributing oxygen to passenger breathing masks, comprising:

  • a source of oxygen under pressure;

    an oxygen distribution line;

    a first gas flow control device having an inlet connected to said source and an outlet connected to said distribution line;

    a pressure reducer having an inlet connected to said source and adapted to deliver oxygen at a predetermined reduced pressure at an outlet;

    a second gas flow control device having an inlet connected to the outlet of said pressure reducer and an outlet connected to said line;

    each of said gas flow control devices having a servo-valve controlling communication between the inlet and the outlet thereof and a pilot two-position solenoid valve for controlling said servo-valve in response to a control signal;

    sensor means for sensing the pressure in the cabin of the aircraft and delivering a signal responsive of said pressure; and

    computer control means connected to receive said pressure responsive signal for delivering a control signal to the solenoid valve of said first gas flow control device in response to said pressure responsive signal being lower than a threshold corresponding to a first predetermined altitude and for delivering a temporary control signal to the solenoid valve of said first gas flow control device and then a continuous control signal to the solenoid valve of said second gas flow control device in response to said pressure responsive signal being comprised between said first threshold and a second threshold corresponding to a second altitude lower than the first altitude.

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