F
OR
M
ODELS
: JGI, JGM, JGN, JGP
AND
JGQ
S
ECTION
4 L
UBRICATION
PAGE 4-8
Oil Temperature Control Valve
Thermostatic
Control Valve
Lube Oil
from Main
Oil Pump
Lube Oil
to Main
Oil Filter
Lube Oil Cooler
Thermostatic control valve configuration may vary from this sche-
matic, depending on valve size. In mixing mode, B connection is
lube oil from main oil pump with tee connection to lube oil cooler
inlet, C is from lube oil cooler outlet and A is to main oil filter. Valve
connections A-B-C are marked on the valve.
A
B
C
F
IGURE
4-2 L
UBE
O
IL
T
HERMOSTATIC
V
ALVE
IN
M
IXING
M
ODE
Thermostatic valves are required in
conjunction with the cooler to con-
trol the oil temperature in the com-
pressor. The thermostatic valve is a
three way valve that has a tempera-
ture sensitive element. As the oil is
heated the sensing element will
open the third port in the valve.
There are two configurations for
installing a thermostatic valve:
diverting mode and mixing mode.
Ariel recommends installation of the
thermostatic valve in the mixing
mode. In the mixing mode, as the oil
heats up, the element opens a port
in the thermostatic valve that allows oil from the cooler to mix with the hot oil from the
bypass. In the diverting mode, the oil is diverted to the cooler when the oil from the compres-
sor is hot enough to open the valve. The diverting mode monitors the temperature of the oil
coming out of the compressor. The mixing mode monitors the temperature of the oil going
into the compressor.
Oil Filtration
Oil filters are required on all compressor frames to remove contamination that can damage
the equipment and contamination that can damage the oil.
Contaminants that damage the equipment can be:
•
Wear particles from the equipment
•
Airborne particles such as dust or sand
•
Solid particles from the gas stream
•
Dirt from new oil from the refinery
Contaminants that damage the oil can be:
•
Soot (commonly from combustion in an engine)
•
Oxidized oil components
•
Air bubbles
The JGC/4, JGD/4, JGU/4, JGZ/4, JGB/4, JGV/4, KBB/4, KBV/4, JGE/6, JGK/6, JGT/6,
JGC/6, JGD/6, JGU/6, JGZ/6, JGB/6, JGV/6 KBB/6 and KBV/6 compressors are equipped
with simplex, cartridge style pleated synthetic type filters as standard. Cartridge filters are
rated as 1 micron nominal and 12 micron absolute filters. The Beta ratings are ß1 = 2, ß5 =
10 and ß12 = 75.
All other Ariel frames are equipped with simplex, spin-on resin-impregnated type filters as
standard. Spin on filters have a 5 micron nominal and 17 micron absolute rating. The Beta
ratings are ß5 = 2 and ß17 = 75.