Section 2
DESCRIPTION
7
system (air-cooled version) consists of a fan, radia-
tor-type cooler/aftercooler assembly, full-flow fluid
filter, thermal valve, fluid stop valve and intercon-
nection piping. For water-cooled models, a shell
and tube fluid cooler, aftercooler and water-flow
regulating valve are substituted for the radiator-type
cooler on air-cooled compressors.
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 170ºF (77ºC).
The fluid passes through the thermal valve, the
main fluid filter and directly to the compressor unit
where it lubricates, cools and seals the rotors and
the compression chamber.
As the discharge temperature rises above 170ºF
(77ºC), 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 fluid filter, and on to the compressor
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.
The fluid filter has a replacement element and an
integral pressure bypass valve. An associated serv-
ice gauge shows red when the filter needs servic-
ing. This gauge has a pressure setting lower than
that of the bypass valve. After the initial 50 hour fil-
Figure 2-3 Compressor Cooling, Lubrication and Discharge System- Water-cooled (Typical)
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