Exhalation Valve - GE Datex-Ohmeda Aisys Carestation Reference Manual

2.13.6 Exhalation
valve
M1046983 04/08
The exhalation valve contains an elastomeric diaphragm that is used along with the
flow valve to control the pressures in the breathing circuit. The exhalation valve
includes two male ports on the bottom for:
• Bellows drive gas (8)
• Exhalation valve pilot (9) - (manifold pressure)
The exhalation valve includes three ports on top that connect to the bellows base
manifold:
• Drive gas pass through (10)
• Drive gas return and pop-off valve flow (11)
• APL exhaust flow to scavenging (12)
A port at the back of the exhalation valve (13) connects to the down tube that directs all
the exhaust flows to the scavenging receiver.
The exhalation valve is normally open. Approximately 2 cm H
necessary to close the valve. When the exhalation port is open, gas flows from the
bellows housing to the scavenging port.
13
8
Figure 2-52 • Exhalation valve
Engine
e Breathing
11
12
eck Valve
10
anical Overpressure
(110 cm H2O)
9
Drive Gas Check Valve
(3.5 cm H2O bias)
nspiratory Flow
Control Valve
2 Theory of Operation
O of pilot pressure is
2
Atmosphere
Popoff
Valve
(10 cm H2O)

Exhalation Valve

(2.0 cm H2O bias)
0-10 LPM Drive Gas
0-10 LPM Patient and Fresh
0-20 LPM Total Typical Flow
200 mL Reservoir
25 psig @
15 LPM
Gas Inlet
Valve
Control Bleed to Ambient
1.0 LPM @ 3.0 cm H2O
if continuous (rate dependent)
B
Negative
relief valv
2-63