Fluid handling – Ambient condition change responsive – Atmospheric
Reexamination Certificate
2003-05-02
2008-03-11
Kirshnamurthy, Ramesh (Department: 3753)
Fluid handling
Ambient condition change responsive
Atmospheric
C137S467000
Reexamination Certificate
active
07341072
ABSTRACT:
The present invention is a centralized flow control unit (CFCU) for regulating oxygen flow in a multiple user emergency oxygen distribution system in passenger aircraft. Upon activation, the CFCU initially allows unregulated flow of oxygen to surge into the distribution system to thereby purge the ambient air out of the system. After a sufficient pressure is achieved in the distribution system, the CFCU regulates the flow mechanically with a diaphragm engaging a regulator valve. The pressure of the oxygen under the diaphragm causes the regulator valve to reduce the flow of the oxygen through the CFCU. The CFCU accounts for changes in altitude by including a bleed passageway in the diaphragm. A small amount of the oxygen under the diaphragm bleeds to the chamber above the diaphragm then a bleed exit allows the oxygen to escape to the ambient air. An aneroid valve in fluid communication with the bleed exit linearly adjusts the amount of oxygen allowed to exit through the bleed exit such that less oxygen is allowed to escape for an increase in altitude. Thus the pressure above the diaphragm increases to thereby allow more oxygen to flow through the regulator valve.
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Carleton Technologies, Inc.
Jaeckle Fleischmann & Mugel LLP
Kirshnamurthy Ramesh
Schneider Craig
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