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2.2.3.2 Backup Supply System
The above are three inlet assemblies of backup cylinder supplies, O
2
, N
2
O and Air, which
functions to introduce the external cylinder gases into the machine. Cylinder gas supplies, which
are O
2
, Air and N
2
O, go into the system through cylinder connectors 2, 4 and 6 respectively. The
O2, Air and N2O cylinder pressures are 6.9–15 MPa, 6.9–15 MPa and 4.2–6 MPa respectively,
which are decreased to approximately 400 kPa through pressure relief valve 7. Each connector is
clearly marked and designed to prevent misinstallation. All connectors have filters and check
valves. Color coded gauges show the pipeline and cylinder pressures. Pressure relief valve 8
functions to prevent the supply gas pressure from being too high. It releases excess gas when gas
pressure exceeds 758 kPa. Supply O2 is outputted after O2 pressure is decreased below 200 kPa
through regulator 24. Pressure switch 23 monitors the O2 and Air supply pressure. When O2 and
Air supply pressure is less than approximately 200 kPa, the ventilator gives the alarm of O2 or Air
supply failure.
Pressure
sampling pipe
of cylinder
7 Regulator
Check valve
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