Dräger Medical Fabius Tiro Technical & Service Manual page 27

Function Description
Figure 12 SORC Functional Diagram (Part 1 of 2)
Dräger Medical AG & Co. KGaA
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The flow control valves are used to adjust the O2 and N2O flows.
Restrictors located at the outlets of the SORC generate back-pressures.
These back-pressures exert a force on the control diaphragms of the SORC.
The O2 back-pressure opens the SORC. The N2O back-pressure closes the
SORC. The pressure ratio at the control diaphragm affects the N2O flow.
The restrictors and the spring tension are dimensioned such that a minimum
concentration of 23 vol.% O2 is always ensured. The maximum O2 flow is
approx. 12 L/min.
6020.002
Fabius Tiro
Revision B Released
21