4. Pilots have a 1/4 in. NPT vent connection in the
spring case. To remotely vent gas from the spring
case, remove the screened vent and connect
1/4 in. / 6.4 mm piping or tubing to the spring case
connection. The piping or tubing should vent to
a safe location, have as few elbows as possible
and have a screened vent on its exhaust. Install
the regulator and any remote vent piping or tubing
so that the vent is protected from condensation,
freezing or substances that may clog it.
CAUTION
To avoid freezeup because of pressure
drop and moisture in the gas, use anti-
freeze practices, such as heating the
supply gas or adding a de-icing agent to
the supply gas.
5. Run a 3/8 in. / 9.5 mm outer diameter or larger
pilot supply line from the upstream pipeline to the
filter inlet as shown in Figure 3, bushing the line
down to fit the 1/4 in. NPT filter connection. Do
not make the upstream pipeline connection in a
turbulent area, such as near a nipple, swage or
elbow. If the maximum pilot inlet pressure could
exceed the pilot rating, install a separate reducing
regulator in the pilot supply line. Install a hand
valve in the pilot supply line and provide vent
valves to properly isolate and relieve the pressure
from the regulator.
6. Attach a 1/2 in. / 13 mm piping or tubing
downstream control line to the 1/2 in. NPT control
line connection on the actuator casings. Connect
the other end of the control line to the pipeline
downstream of the regulator. Do not attach the
control line near any elbow, swage, block valve
or any other location that might cause turbulence.
Install a full port ball valve in the control line
to shutoff the control pressure when using
the bypass.
7. If a quick acting solenoid is to be installed
downstream of a regulator, the regulator and
solenoid should be located as far apart as
practical. This will maximize the gas piping
volume between the regulator and solenoid and
improve the regulator response to quick changing
flow rates.
8. Consult the appropriate instruction manual for
installation of an optional pneumatic or electric
remote control drive unit. For optional remote
pneumatic loading of a 6350 or 61 Series pilot,
make the loading piping connections to the
1/4 in. NPT vent connection.
Wide-Open Monitor Regulator (Figure 4)
1. Follow the procedures in the All Installations
section and then continue with step 2 of
this section.
2. Connect the control line of the wide-open
monitoring regulator to the downstream piping
near the working regulator control line connection.
During normal operation, the wide-open regulator
stands wide-open with the pressure reduction
being taken across the working regulator. Only
in case of working regulator failure does the
wide-open monitoring regulator take control at its
slightly higher setting.
Regardless of which regulator is used as the monitor,
it should be equipped with a pilot supply regulator
set to limit the pilot supply pressure to 10 to 15 psig /
0.69 to 1.0 bar above control pressure. Since the
pilot on the monitoring regulator is wide-open during
normal operation, the pilot supply regulator is used
to prevent differential pressure relief valve chatter on
the monitoring regulator pilot.
Working Monitor Regulator (Figure 5)
1. Follow the procedure in the All Installations section
and then continue with step 2 of this section.
2. Attach 3/8 in. / 9.5 mm tubing (for Type 161EBM)
downstream control line to the control line (sense)
connection on the pilot. Connect the other end of
the control line to the pipeline downstream of the
downstream working regulator. Do not attach the
control line near any elbow, swage, block valve or
any other location that might cause turbulence.
3. Apply pilot sense pressure by connecting the
outlet of the monitor pilot to the inlet of the working
monitor pilot.
Startup and Adjustment
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure
specified on the order. If no setting was specified,
outlet pressure was factory-set at the mid-range of
the pilot control spring. Before beginning the startup
procedure in this section, make sure the following
conditions are in effect:
7
Type EZL
