2-49
The above are three pipeline gas supplies, O
2
, N
2
O and Air, which functions to introduce the
external pipeline gases into the machine. Since the pressure of external gas is very high and the
external gas contains foreign substance, pressure reducing valves, filters and pressure relief valves
are available in the supply gas circuit. Also, check valves are equipped in the supply gas circuit to
prevent gas from flowing back into the pipeline or cylinder. The pipeline pressure ranges between
280 and 600 kPa. 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. Each connector is clearly
marked and designed to prevent misconnection. All connectors have filters and check valves.
Color coded gauges show the pipeline and cylinder pressures. 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.
Air pipeline
supply inlet
assembly
N2O pipeline
supply inlet
assembly
O2 pipeline
supply inlet
assembly
Drive
as
Needle valve
Needle valve
Backup O2 supply
(without backup cylinder)
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