A7™ Service Manual 046-006272-00 1 - 47
Theory of Operation The Breathing System
FIGURE 1-54 Manual Mode, Expiration Diagram
1.5.6 Pneumatic PEEP
The PEEP valve regulates the pressure at which the exhaust valve opens. Therefore, if PEEP is selected,
static pressure on the pilot port of the exhalation valve sets the PEEP level during the automatic
ventilation.
1.5.7 Ventilator in Standby
When the anesthesia system is in standby mode, monitoring will be inactive, and automatic
ventilation will be unavailable. The patient should not be ventilated when the system is in standby
mode.
1.5.8 Breathing System Components
1.5.8.1 Ventilation Bellows System
The ventilator's driving system is a flow generator. Driving gas fills the bellows dome to compress the
bellows. The breathing gas is pressed out of the bellows into the patient breathing circuit. The
bellows is refilled with fresh gas and the expired gas from the patient.
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