YZ Systems NJEX 7300L, Instructions & Operating Manual, Page: 77 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 67 NJEX 7300L ver.09042003
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Setting System Pressures and
Valves
Before attempting to start the system, check for proper
valve positions as indicated on the normal operation
schematic on the enclosure door, and set all pressures
accordingly, figure 208.
1. Adjust supply gas regulator to provide 75 psi (5.17
Bar) to the NJEX gas filter.
2. Temporarily open valve V4 to fill the expansion tank
toa pressure of 25 psi (1.72 Bar) then close V4.
3. Verify low pressure relief operation and adjust as
necessary to maintain a specific pressure of 25psi
(1.72 Bar).
4. Adjust the pump actuation regulator to the required
pressure to inject into pipeline pressure as indicated
on the normal operation schematic located on the
enclosure door.
5. Adjust the blanket gas regulator for the bulk storage
tank.
6. Check entire system for gas leaks and verify that
the set pressures remain constant.
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Low Pressure Relief Adjustment
The overflow protector, figure 209, incorporates a low
pressure relief in the cap assembly for the purpose of
maintaining the maximum expansion tank pressure at
25 psi (1.72 Bar).
To test and adjust follow these steps:
1. With valve V6 open, slowly open valve V4 until gas
begins discharging at exhaust port of the overflow
protector.
2. Close valve V4 and see where pressure stabilizes
which should be 25 psi (1.72 Bar).
3. If adjustment is needed:
a) First, loosen adjustment lock nut, located at the
top of the overflow protector. To increase
pressure in the tank, turn the adjustment screw
in, or to the right. To lower pressure tank, turn
the adjustment screw out, or to the left.
b) Tighten the lock nut.
c) Repeat until the desired pressure of 25 psi (1.72
Bar) is obtained as described in step 2 above.
Figure 208
Adjustment
lock nut
Adjustment screw
Overflow
protector
Figure 209
Valve V6