B/e Aerospace Systems Gmbh

Jan-Hinnerk Scheel

Marco Silvi Antonini

A personal breathing system incorporating a phased-dilution demand oxygen regulator (PDDOR) includes a pressurized oxygen source and oronasal mask, a dilution valve for supplying ambient air and a demand valve for supplying pure oxygen. The PDDOR senses the mask pressure associated with the start of an inhalation cycle, maintaining pressure to the demand valve through an initial demand phase during which 100% pure oxygen is supplied through the demand valve. Control pressure within the PDDOR drops throughout the initial demand phase; when the pressure drops below a lower threshold the PDDOR main valve is closed, blocking the demand valve and cutting off the oxygen supply. Ambient air is provided to the mask via a dilution valve to preserve flow to the user.

Phase dilution demand oxygen regulator (PDDOR) system for personal breathing

The invention relates to a passenger oxygen mask for the emergency supply of oxygen in an aircraft, with a breathing bag which is provided on the entry side with a tube for the oxygen supply, wherein the tube and the breathing bag consist of polyurethane. The invention further relates to a breathing bag, with which a flow indicator is integrated into the connection piece.

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Wakendorf, Germany

Jan-Hinnerk Scheel