Sullair 12 Series User Manual

Section 2
DESCRIPTION
7
Figure 2-3 Compressor Fluid Cooling and Lubrication System
when the fluid temperature is below 170ºF (77ºC).
The fluid passes through the thermal valve, themain
filter and directly to the compressor unit where it lu-
bricates, cools and seals the rotors and the com-
pression 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 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 entering
the compressor unit, this fluid is taken through the
fluid filter, thus assuring properly filtered lubricant
for bearing supply.
The fluid filter has a replacement element and an in-
tegral pressure bypass valve. A gauge on theinstru-
ment panel 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 filter
change, thegauge will rarely show red under normal
operating conditions.
The fluid stop valve prevents fluid from filling the
compressor unit when the compressor is shut down.
When the compressor is operating, the fluid stop
valve is heldopen by air pressurefrom the compres-
sor unit allowing a free flowof fluid from thereceiver/
sump back to the compressor unit. On shutdown,
the compressor unit pressure is reduced, causing
the fluid stop valve toclose and isolate the compres-
sor unit from the cooling system
Water-cooled versions of the compressor have a
water-flow regulating valve (not shown) which oper-
ates to conserve water during periods of varying
load on the compressor. This same valve automati-
cally shuts off the water supply when the compres-
sor is shut down. In addition, water-cooled models
have a water pressure switch to prevent operation
with inadequate water pressure.

Sullair 12 Series Specifications

General

Brand	Sullair
Model	12 Series
Category	Air Compressor
Language	English