REPLACEMENT PROCEDURES (continued) NM2B
4.13 O2 Flush Valve
The O
2
flush valve is located at the front of the machine next to the freshgas
outlet. Access to the flush valve requires removal of the table top. Figure 4-13
shows the mounting and assembly details of the flush valve.
4.13.1 Set the System Power switch to STANDBY.
4.13.2 Disconnect all pipeline hoses.
4.13.3 Close the O
2
cylinder valve.
4.13.4 Press the O
2
Flush valve to drain oxygen pressure from the system.
4.13.5 Remove the screws holding the table top to the machine and lift out
the table top.
4.13.6 Hold the O
2
Flush button in and rotate it until one of its set screws
are visible through the access hole in the guard ring, and loosen the
set screw.
4.13.7 Turn the O
2
Flush button 180 degrees, hold it in and loosen the other
set screw.
4.13.8 Remove the O
2
Flush button and washer from the valve shaft.
4.13.9 Disconnect the two compression fittings at the valve.
NOTE: Do not lose the flow restrictor located at the right-angle
fitting. This restrictor will be transferred to the
replacement valve assembly.
4.13.10 The O
2
Flush valve is retained by the guard ring on the front of the
machine frame. Hold the body of the Clippard valve with an open end
wrench; insert a rod or hex wrench through the holes in the guard
ring (or use a spanner wrench), and un-screw the guard ring from the
front of the frame rail.
4.13.11 Assemble the replacement O
2
Flush valve, spacer, internal tooth lock
washer and guard ring through the frame and tighten the assembly,
making sure that the valve is mounted straight.
Rev. A
4-40
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