YZ Systems NJEX 7300L, Инструкция и руководство по эксплуатации, Страница: 76 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 66
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
Figure 206
Figure 207
Solenoid Valve & Pneumatic
Relay Manifold
Two low power solenoid valves are mounted on this
manifold, figure 206. The solenoid valve, SV2 located on
the left, actuates the fill valve, while the other solenoid
valve, SV1 located on the right, pilots the pump pneu-
matic relay valve.
One pneumatic relay valve is also mounted on this mani-
fold. It is located just below the solenoid valves and serves
to actuate the pump when it receives a pneumatic signal
from the pilot relay discusses in the previous paragraph.
Supply and exhaust ports are located on the outside of
the manifold to permit operator connections on the back
of the system enclosure.
Additionally, there is located on this manifold, valve V16
lower left with a black knob. V16 is normally open, and
is the supply gas isolation valve.
Expansion Tank
The expansion tank, figure 207, is mounted on the back of
the enclosure and acts as a pressure source and buffer for
the Verometer. As the Verometer is filled or emptied, blanket
gas flows into or out of the expansion tank as required.
Because of the relatively large difference in the volumes of
the Verometer and the expansion tank, the fluctuation in
operating pressure within this system is minimal.
Mounted on the expansion tank are: a relief valve,
preset to 85 psi (5.86 Bar); an overflow protector/low
pressure relief assembly mounted to valve (V6 with a
silver knob); and an expansion tank drain valve (V14
with a silver knob), on the bottom of the tank.
Valve V4 (located inside the System Enclosure) is
normally closed, but is opened to charge the expan-
sion tank with gas as required during system start
up or purge process. Additionally, valve V5 is
normally closed, but is opened to vent the gas from
the expansion tank for maintenance. Valve V14 is
normally closed, but can be opened as an optional
step in the forward purge process to purge any
liquid from the expansion tank that may have
accumulated, and place it back into the bulk storage
tank.
Expansion Tank
Solenoids
Pneumatic
Relay