Gas Flow Theory of Operation
1 - 24 046-001141-00 A5/A3™ Service Manual
1.3.4.3 System Switch Assembly
O2 goes into the system switch (24); and flows into the needle valve. The system switch has an
electrical outlet that controls the power-on status of the system. When the system switch is turned
on, O2 enters the needle valve and the system is powered on simultaneously. The anesthetic
ventilator starts to monitor the status of the system. When the system switch is turned off, O2 cannot
enter the needle valve and the system is powered off.
1.3.4.4 Flow Adjust and Control Assembly
FIGURE 1-12 Flow Adjust and Control Assembly
The Needle Valve (58) controls the gas flows. The ORC (25) controls the proportion between O2 and
N2O, and ensures that the O2 concentration is not less than 25%. Turning the needle valve knob
counterclockwise increases the flow; turning it clockwise decreases the flow.
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