YZ Systems NJEX 8300G, Manual, Page: 71 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
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NJEX 8300 ver .092001 ATEX Rev.
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Model 8000 Pump
The NJEX 8000 pump, figure 175, is a pneumatically
actuated, positive displacement, reciprocating plunger
pump. The 8000 is actuated with compressed air or
pipeline gas at a pressure of 30 - 90 psi
(2.07 - 6.21 Bar)
,
refer to Section 2, the System Flow Schematic, figure4,
on page 6
. The pump has an adjustable displacement of
6.0cc, 5.0cc, 4.0cc, 3.0cc, or 2.0cc. It achieves
proportional-to-flow injection through adjustment of the
stroke rate. The 8000 is rated for a maximum stroke rate
of 30 strokes per minute.
Each time the pump strokes, the plunger displaces
hydraulic fluid against the pump diaphragm, which in
turn displaces odorant through the discharge check
valve. The pump diaphragm acts as an isolation device
between the hydraulic fluid and the odorant, minimizing
the risk of odorant escape into the atmosphere. Each
time the plunger returns, it completely removes itself
from the plunger seal. This allows any air trapped in the
hydraulic system to be vented.
Odorant Discharge Manifold
This manifold is located on the back wall of the mechani-
cal enclosure, just to the left of the verometer and above
the pump,
figure 176 . This manifold, located inside the
enclosure, has three connections on the bottom of the
manifold. The inlet connection in the center of the
manifold is the pump discharge, the connection to the
right is to the Verometer and the third connection to the
left is to the purge bypass loop. These fittings are
connected at factory to the appropriate component.
Three outlet ports for the odorant discharge manifold are
located on the back of the manifold and extend through
the enclosure wall. When facing the back of the enclo-
sure from right to left, these ports are for the expansion
tank drain, the pipeline connection, and the expansion
tank pressure connection.
Figure 176
Figure 175