
Fabius
®
Function Description
2-12
Cop
yr
ight
2000 Dr
aeger
M
edical,
In
c.
sec2_
funcde
scr
ip_
b.fm
The flow control valves are used to adjust the O
2
and N
2
O flows.
Restrictors located at the outlets of the S-ORC generate back-pressures. These
back-pressures exert a force on the control diaphragms of the S-ORC. The O
2
back-pressure opens the S-ORC. The N
2
O back-pressure closes the S-ORC. The
pressure ratio at the control diaphragm affects the N
2
O flow.
The restrictors and the spring tension are dimensioned such that a minimum
concentration of 21 vol.% O
2
is always ensured. The maximum O
2
flow is approx. 9
L/min.
Fig. 11:
S-ORC function diagram, part 2
O2
N2O
O2
N2O
N2O check valve
restrictors
control
diaphragms
flow control
flowmeters
operating-point
adjusting screw
Summary of Contents for Fabius 4116029
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