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RJ600 Series
Outdoor Installations with Underground
Vent Lines
When installed per code, the underground vent line
must not restrict the gas flow from the regulator's
internal relief valve and must remain clear of debris,
dry and fully open at all times. Joints in the vent line
must be fully sealed to prevent moisture intrusion
into the vent line. A vent assembly, such as the
Y602 Series, should be used on the end of the vent
line to prevent entry of precipitation, water or other
debris. When underground vent lines are used in
humid environments, the vent line must be designed
to allow for proper drainage of any collected moisture
or condensation.
Adjustment
Each regulator is factory set. If it becomes necessary
to increase the outlet pressure, remove the closing
cap and turn the adjustment screw clockwise. Turn
the adjusting screw counterclockwise to decrease the
outlet pressure.
The inlet and outlet pressure plug may be removed
using a 7/16 in. / 11 mm hexagon wrench. The
pressure tap is restricted, so the plug can be removed
with pressure on the outlet of the regulator. Install
a pressure gauge to determine the regulator's inlet
pressure and outlet setting during adjustment, (actual
pressure at the second stage regulator may be less
due to line loss). After setting, add thread sealant
to the 1/8 NPT pipe plugs. Reinstall the pipe plugs
by threading into the gauge ports finger-tight and
then wrench tighten 1-1/2 to 3 turns past finger-tight
(approximate maximum torque of 12 ft-lb / 16 N•m).
Replace the closing cap. Check the pipe plugs
for leakage.
Overpressure Protection
▲
WARNING
Some type of overpressure protection
is needed if actual inlet pressure can
exceed the outlet pressure rating.
Overpressuring any portion of this
equipment above the limits shown in
the Specifications section may cause
damage to regulator parts, leaks in
the regulator or personal injury due to
bursting of pressure-containing parts or
explosion of accumulated gas.
6
If any portion of the regulator is exposed
to an overpressure condition that
exceeds the limits in the Specifications
section, it must be inspected for damage
that may have occurred.
Large volumes of gas may discharge
through the regulator vent during
internal relief valve operation, which
can, if not controlled, result in fire or
explosion from accumulated gas.
The RJ600 Series regulators contain internal relief
valves. The internal relief valve in all units will give
overpressure protection against excessive build-
up resulting from seat leakage due to worn parts or
chips or foreign material on the orifice. The amount
of internal relief protection provided varies with the
regulator type and the cause for the overpressure
relief valve operation. When the internal relief valve
opens, gas escapes to the atmosphere through the
regulator's vent.
Some type of additional external overpressure
protection must be provided if the outlet pressure in
an overpressure condition exceeds the inlet pressure
rating of the gas system or downstream equipment.
Common methods of external overpressure protection
include relief valves, monitoring regulators, shutoff
devices and series regulation.
Maintenance
▲
WARNING
To avoid personal injury or equipment
damage, do not attempt any
maintenance or disassembly without
first isolating the regulator from
system pressure and relieving all
internal pressure.
Regulators that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Fisher™ should be used for repairing
Fisher regulators. Relight pilot lights
according to normal startup procedures.
Due to normal wear or damage that
may occur from external sources,
these regulators must be inspected and
maintained periodically. The frequency
of inspection and replacement of the
regulators depends upon the severity of
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