8
connections (if compatible with the application) which indicates leaks by bubbling. To further check for leaks,
or if the leak detection solution can not be used, close the cylinder valve for a period of time (recommended
24 hours), and observe the high pressure gauge for a drop in pressure. If so indicated, recheck the CGA
connection and all other high-pressure port connections.
6. Never attempt to fix a leak under pressure. If leaks are detected, depressurize the system and retighten
the connection. Begin again at step 3.
7. Slowly turn the line regulator knob clockwise. This will increase the pressure of the line. Adjust to the
desired working pressure and again check for leaks using the methods described above.
OPERATION
The arrow on the priority valve always points to the primary side; the bank opposite the primary side is
considered the reserve side. Starting with the arrow pointing to the right side, gas will flow from the right side
cylinder. As the gas in the primary side is depleted, the gas pressure will drop on the gauge of the primary
regulator. When the pressure drops to the pressure setting of the reserve side regulator, flow will begin from
the reserve cylinder; the inlet pressure on the primary side will stablize. This is called a changeover. At this
point, the gas pressure on the reserve side (preset regulator) will drop. This indicates that its time to change
the cylinders on the primary side. Before removing the nearly depleted primary cylinder, the priority valve
should be rotated 180°. This makes the reserve cylinder the primary source. Remove the depleted cylinder
and replace with a full cylinder. Before removing the cylinder be sure to close the cylinder valve and any
other valves that connect the cylinder to the system. Do not open any cylinder valves until all cylinders are
replaced. The full, replacement cylinder is now the reserve cylinder. Note: while changing cylinders on one
side, there will be no interruption in flow. A depleted cylinder will have the following gas pressure remaining:
Model Number
547 1XXX
547 1XXX*
547 EXXX
547 2XXX
547 3XXX
547 4XXX
Cylinder Pressure
250-350 PSIG
17-24 BAR
1050-1150 PSIG*
72-79 BAR*
1250-1500 PSIG
86-103 BAR
1800-2300 PSIG
124-159 BAR
2800-3300 PSIG
193-228 BAR
3800-4300 PSIG
262-297 BAR
*higher switch select setting for 5471XXX models
Gas will continue to flow from the primary side until the outlet pressure of the primary regulator matches the
pressure setting of the reserve regulator. (The pressure setting of the priority valve regulator changes when
the knob is turned 180°). When the gas pressure stops dropping on the primary side regulator and starts
to drop on the reserve side regulator, it is time to change the primary cylinder. The knob is rotated 180° to
the reserve side changing priority before the depleted cylinder is changed. It is helpful to maintain a log of
cylinder pressure, noting which direction the arrow is pointing on the priority valve. When the pressure gauge
is very low and the reserve side indicates that gas has begun to flow from the reserve cylinder, it is time to
rotate the knob and attach a full cylinder in reserve.
If the knob is not rotated before the empty cylinder is changed, two things can happen. First, gas may flow
from the changed cylinder to the existing cylinder. This is because the pressure setting of the regulator on
the primary side allows the regulator main valve to remain open. Second, when the cylinder is changed,
gas will begin to flow from the new cylinder, stopping flow from the existing cylinder. This means the existing
cylinder may be partially empty. After several cycles, it is possible that the reserve cylinder may empty
shortly after a switchover occurs. Always remember to rotate the knob on the priority valve regulator before
changing a depleted cylinder.
To change 5471XXX models with switch select to higher switching pressure settings to achieve maximum
outlet pressures of 800 psig. Locate the set screw that limits the travel of the right side selector knob, it is
located on the side of the knob and is screwed into a slot in the knob. When set for the lower factory default
switching pressure it is located closer to regulator body in that slot. Remove the set screw and rotate the
right side selector knob clockwise two full rotations. Reinstall the set screw. With the arrow pointing to the
