2-4
2.2.3 Key to Symbols
Filter
Regulator
Pressure gauge
Check valve
Gas supply connector
Pressure relief valve
Flowmeter
Flow control valve
Pressure switch
Flow restrictor
2.2.4 Description
2.2.4.1 Gas Supplies
The above picture shows the O2 pipeline supply inlet assembly. The anesthesia machine’s
pneumatic circuit starts from the gas supplies, which functions to introduce the external
pipeline or cylinder 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
following figures show the supply gas circuit.
O2 pipeline supply inlet
Pressure sampling
connector for
pipeline supply
gas pressure
gauge
Drive gas
connector
Fresh gas inlet
24. Regulator
23. Pressure switch
7. Safet
valve
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