The Breathing System Theory of Operation
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If airway pressure exceeds the set value of the APL Valve, the residual gas will pass through the APL
Valve to the scavenging system (AGSS).
FIGURE 1-53 Manual Mode, Inspiration Diagram
1.5.5 Manual Mode, Expiration
When the Auto/Manual switch is set to Manual, the system closes the Auto ventilation path. Gas
flows from the patient, through the expiratory check valve, and into the breathing bag. During
exhalation, fresh gas enters the Breathing System. Residual fresh gas passes through the APL valve to
the AGSS.