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2 Theory of Operation
1006-0836-000 02/03
2-21
2.5.4 Exhalation
(PEEP) Control
The exhalation valve contains an elastomeric diaphragm that is used to control the
pressures in the breathing circuit.
The exhalation valve is normally open. When the exhalation port is open, gas flows
from the bellows housing to the scavenging port. Approximately
2 cm H
2
O of pilot pressure is necessary to close the valve. Pilot control of the
exhalation valve is done with PEEP Control Valve (A), Supply Pressure Switch (B),
and the PEEP Safety Valve (C).
Figure 2-13 • Exhalation manifold
BLEED RESIST0R
EXHALATION
VALVE
BREATHING CIRCUIT
BELLOWS
EXHAUST TO
SCAVENGING
SYSTEM
REGULATOR
25 psi
INSPIRATORY
CONTROL
VALVE
VENT TO
ROOM AMBIENT
ATMOSPHERE
2-MICRON
INLINE INLET
FILTER
SUPPLY GAS
35-100 psi
PRESSURE
RELIEF
FLOW
TEST
POINT
MECHANICAL
OVERPRESSURE
RELIEF
110 cm H2O
ATMOSPHERE
FREE BREATHING
CHECK VALVE
PEEP
SAFETY
VALVE
PEEP
CONTROL
VALVE
SUPPLY
PRESSURE
SWITCH
RESERVOIR
A
C
B
Содержание 7100
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