YZ Systems NJEX 8300G, Manual, Page: 72 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 65 NJEX 8300 ver.092001 ATEX Rev.
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Two valves located this manifold control the flow of the
odorant blanket gas through the manifold. The valve
located on the left, with the blue knob is the purge valve,
refer to Section 12: System Maintenance, page 74
Figure 197, valve V3
. The valve, with the red knob, is
the bypass valve,
refer to Section 12: System Mainte-
nance, page 74 Figure 197, valve V2 . During normal
operation, both valves are closed. The bypass valve is
opened to empty the 8300G of odorant,
refer to Section
12: System Maintenance, page 74 Figure 197 while the
purge valve is opened as part of preparing the system
for operation
refer to Section 12: System Maintenance,
page 80, Figure 200 .
An integral wafer check valve is built into the odorant
discharge manifold. The wafer is located on top of the
plug that is inserted in the bottom of the manifold. This
check valve is located in the fluid path between the pump
discharge connection and the pipeline connection port.
The gage located on top of this manifold displays the
Expansion Tank pressure.
NJEX Gas Filter
A 25 micron coalescent filter is provided with each
8300G. This filter,
figure 177,
is installed on the back
outside of the enclosure and should be connected to the
regulated
(75 psi / 5.17 Bar)
actuation gas supply
provided by the system operator. By conditioning the
incoming actuation gas, a clean pneumatic supply will
be provided to the solenoid valves. This will ensure a
longer operational life for the pneumatic control system.
If the actuation gas supply has a high water content and
/ or a low hydrocarbon dew point, additional filtration and
heating of the actuation gas supply may be necessary.
Bottled nitrogen can also be used as an alternate gas
supply source if gas conditioning is a problem.
Figure 177