YZ Systems NJEX 7300L, Instructions & Operating Manual, Page: 75 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 65 NJEX 7300L ver.09042003
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tank drain, the pipeline connection, and the expansion
tank pressure connection.
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 10, page 64, illustration 204, valve V3 .
The valve, with the red knob, is the bypass valve, refer
to Section 10, page 64, illustration 204, valve V2 . During
normal operation, both valves are closed. The bypass
valve is opened to empty the 7300L of odorant,
refer to
Section 12, page 74, illustration 228 while the purge
valve is opened as part of preparing the system for
operation
refer to Section 12, page 80, illustration 231 .
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
7300L. This filter, figure 205, 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 205