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Section 2
DESCRIPTION
Figure 2-2 Sullair Rotary Screw Air Comprewssor- Water-cooled (typical component layout)
flood lubricated--type compressor. This unit pro-
vides continuous pulse--free compression to meet
your needs.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
Refer t o F igur es
2 -- 3
brication System (air--cooled version) consists of a
fan, fan motor, radiator- -type aftercooler/fluid
cooler, full flow fluid filter, thermal valve, and in-
terconnecting piping and tubing. For water--
cooled models, two shell and tube heat exchang-
ers and a water- -flow regulating valve are substi-
tuted for the radiator--type cooler 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 compres-
sor 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 170_F (77_C).
The fluid passes through the thermal valve, the main
filter and directly to the compressor unit where it lu-
6
and
2 --
4. T he Cooling and Lu-
bricates, cools and seals the rotors and the com-
pression chamber.
As the discharge temperature rises above 170_F
(77_C), due to the heat of compression, the thermal
valve begins to close and a portion of the fluid then
flows through the cooler. From the cooler the fluid
flows to the main filter and then on to the compres-
sor unit.
A portion of the fluid flowing to the compressor is
routed to the anti--friction bearings which support
the rotors inside the compressor unit. Prior to enter-
ing the compressor unit, this fluid is taken through
the fluid filter, thus assuring properly filtered lubri-
cant for bearing supply.
The fluid filter has a replacement element and an in-
tegral pressure bypass valve. A gauge on the instru-
ment panel shows red when the filter needs servic-
ing. This gauge has a pressure setting lower than
that of the bypass valve. The gauge should be
checked with compressor running at full system
pressure.
Water--cooled versions of the compressor have a
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