Installed Oxygen Systems
Installed oxygen system may be any of the three systems,
in general:
(a) Continuous
Flow System
(b) Diluter
Demand System
(a) Continuous
Flow System
(c) Pressure
Demand Systems
Subsequent
sections will discuss these systems along with their typical system layouts.
Continuous Flow System
a typical continuous flow oxygen system is illustrated which
is installed in a single engine general aviation type of aircraft. The external
filler valve is installed in a location that is convenient to service and is
usually covered with an inspection door. It has an orifice that limits the
filling rate and is protected with a cap to prevent contamination when the
charging line is not connected. The storage cylinder is of an approved type
and is installed in the aircraft in such a location that is most appropriate
for weight and balance considerations. The shutoff valve on the cylinder is of
the slow-opening type and requires several turns of the knob to open or close
it to prevent too rapid a change in the flow rate which could place too much
strain on the system or could generate too much heat. Some installations use a
pressure reducing valve on the cylinder, and when the reducer is placed here,
the pressure gauge must be mounted on the cylinder side of the reducer to
determine the amount of oxygen in the cylinder.
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