Dräger Narkomed 2B Service Manual page 101

NM2B
4.20 Ventilator Bellows Valve and Guide Assembly with Pressure Limit Control
(AV-2 Ventilator)
The Ventilator Bellows Valve and Guide Assembly, and the Pressure Limit
Control are located in the bellows box on the left side of the machine. Access
to the components requires removal of the bellows box front panel, and removal
of the upper bellows support plate from the bellows box. Figure 4-20 shows the
pneumatic connections and the mounting arrangement of the components.
4.20.1
4.20.2
4.20.3
4.20.4
4.20.5
4.20.6
4.20.7
4.20.8
4.20.9
4.20.10 Loosen the rear support plate screw, and remove the two front
4.20.11 Pull the support plate forward, then lower it to a point where the
4.20.12 Disconnect the large diameter tubing from the venturi, and the small
4.20.13 Carefully remove the assembly from the machine. Mounting screws
Rev. A
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REPLACEMENT PROCEDURES (continued)
Set the System Power switch to STANDBY, and remove AC power
from the machine.
Close all cylinder valves, and disconnect the pipeline hoses from the
machine.
Press the O Flush button to relieve pressure from the system.
2
Adjust the TIDAL VOLUME control to raise the volume indicator to
its maximum setting.
Disconnect the breathing hose and the scavenger hose from the
bellows assembly. Loosen the wing nuts and remove the bellows
assembly.
Remove the canister from the bellows box by pulling it downward.
Unscrew the bellows guide from the adjustment rod.
Loosen the set screws on the tidal volume indicator (note the position
of the indicator on the adjustment rod so that it can be reassembled
in the same position) and remove the indicator.
Remove the screws holding the bellows box front panel and knob
assemblies, and remove the panel.
support plate screws.
tubing connections are accessible.
diameter tubing from the auto-ranging valve.
for the adjustable pressure limit control and the valve case assembly
are shown in the illustration.
4-69
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