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TM 9-8000
Figure 34-32. Typical Air Compressor, Two-Cylinder.
it to release the air pressure from beneath the unloading
tube tends to straighten. When reservoir air pressure
diaphragm, allowing the unloading valves to return to
reaches the cutout setting of the governor, the spring
their seats. Compression then is resumed (fig. 34-32).
tube load on the valves has been reduced sufficiently to
permit the air pressure to raise the valves. The upper
valve closes the exhaust port and the lower valve opens
c. Governor. The governor maintains the air pressure in
the connection for the air under pressure to the
compressor unloading mechanism. If air pressure drops
the reservoir between the desired maximum and
to the governor cut-in setting, the pressure of the spring
minimum  values,  by  controlling  the  compressor
tube on the valves Increases and forces the valves
unloading mechanism. The Bourdon gage principle of a
down, opening the upper valve and seating the lower
curved metal tube that tends to straighten under internal
valve. Air under pressure from the unloading mechanism
pressure is utilized. Air under pressure from the reservoir
is al- lowed to escape through the exhaust port while the
always is present below the lower valve and in the tube.
air under pressure from the reservoir is sealed off by the
As air pressure increases, the load of the tube (fig. 34-
lower valve.
34) on the lower valve is relieved, because the


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