YZ Systems NJEX 7300L, Instructions & Operating Manual, Page: 74 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 64
NJEX 7300L ver.09042003
SSSSS
ECTION ECTION ECTION ECTION ECTION
10: 10:
10: 10:
10: M M
M M
M
ECHANICAL ECHANICAL ECHANICAL ECHANICAL ECHANICAL
S S
S S
S
Y YY Y YSTEM STEM STEM STEM STEM
Model 7000F Pump
The NJEX 7000F pump, figure 203, is a pneumatically
actuated, positive displacement, reciprocating plunger
pump. The 7000F is actuated with compressed air or
pipeline gas at a pressure of 30 - 60 psi (2.07 - 4.14 Bar),
refer to Section 2, the System Flow Schematic, figure 4,
on page 6
. The pump has an adjustable displacement of
1.0cc, 0.8cc, 0.7cc, 0.6cc, 0.5cc, 0.4cc, 0.3cc or 0.2cc. It
achieves proportional-to-flow injection through adjustment
of the stroke rate. The 7000F is rated for a maximum
stroke rate of 46 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.
The 7000F incorporates a cartridge design in the four
areas that are most likely to require maintenance. They
are: the diaphragm assembly, the inlet check valve, the
discharge check valve, and the plunger bushing / seal
assembly. The cartridge design provides easier mainte-
nance resulting in less down-time.
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 204. 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
Figure 204
Figure 203