Section 2
DESCRIPTION
6
tenance or inspection of the internal parts of the
compressor unit permitted in accordance with the
terms of the warranty.
Fluid is injected into the compressor unit in large
quantities and mixes directly with the air as the ro-
tors turn compressing the air. The fluid flow has
three main functions:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compres-
sion.
2. It seals the leakage paths between the rotors and
the stator and also between the rotors them-
selves.
3. It acts as a lubricating film between the rotors al-
lowing one rotor to directly drive the other, which
is an idler.
After the air/fluid mixture is discharged from the
compressor unit, the fluid is separated from the air.
At this time, the air flows to the service line and the
fluid is cooled in preparation for re-injection.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
Refer to Figures 2-2, 2-3A and 2-3B. The cooling
and lubrication system consists of a radiator
type aftercooler/fluid cooler, full flow fluid filter,
fluid stop valve, thermal valve and interconnec-
tion piping. For water-cooled models, a shell and
tube fluid cooler, and aftercooler are substituted for
the radiator type coolers listed above.
The pressure in the receiver/sump causes fluid flow
by forcing the fluid from the high pressure area of
the sump to an area of lower pressure in the com-
pressor unit.
Fluid flows from the bottom of the receiver/sump to
the thermal valve. The thermal valve is fully open
when the fluid temperature is below 180°F/82°C
(195°F/91°C for 24KT machines). The fluid passes
through the thermal valve, the fluid filter and direct-
ly to the compressor unit.
As the discharge temperature rises above
Figure 2-1B Sullair Series LS25-150 Rotary Screw Compressor (Typical Water-cooled Model)
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