FL Series
8
Startup
1. Before introducing any pressure to the unit, close
hand valve A in the distribution pressure control line and
hand valve B in the intermediate pressure control line.
Pilot supply pressure must be intro-
duced into the regulator prior to intro-
duction of any downstream pressure or
internal damage may occur due to
reverse pressurization of the pilot and
main valve components. Pilot supply
pressure must be at least 15 psi (1,0 bar)
greater than control pressure for proper
operation.
2. Slowly open the hand valve in the pilot supply line.
3. Slowly open the upstream block valve and partially
open the downstream block valve for minimum flow.
4. Slowly open hand valve B and allow the intermedi-
ate pressure to increase to the working pilot setting.
5. Put the second-stage working regulator into
operation according to recommended procedures and
instructions furnished with the second-stage working
regulator.
6. After the distribution pressure has been estab-
lished slowly open hand valve A.
Pilot Adjustment
The second-stage working regulator must be set to
operate at a lower pressure than the monitoring pilot or
the monitoring pilot will try to take control of the
distribution pressure. Follow the steps listed to obtain
the desired results.
1. Increase the setting of the monitoring pilot by
loosening the locknut and turning the adjusting screw
clockwise (into the spring case cap) until the working
pilot is in control of the intermediate pressure and the
second-stage working regulator is in control of the
distribution pressure.
2. Adjust the setting of the working pilot by loosen-
ing the jam nut and turning the adjusting screw clock-
wise (into the spring case cap) to increase the interme-
diate pressure, or counterclockwise (out of the spring
case cap) to reduce the intermediate pressure. Adjust
until desired intermediate pressure is reached.
3. Adjust the second-stage working regulator to the
desired distribution pressure by following instructions
for that particular regulator.
4. Adjust the setting of the monitoring pilot to
establish the desired emergency distribution pressure,
which is to be maintained in the event of failure of the
second-stage working regulator. The steps followed
may vary with each piping situation. The basic method
remains the same.
The following procedure serves as an example which
can be used or modified to make monitoring pilot
adjustments in any installation.
Increase the outlet pressure setting of the second-
stage working regulator until the monitoring pilot takes
control of the distribution pressure. Adjust the monitor-
ing pilot setting until the desired emergency distribution
pressure is achieved. Refer to table 2 for the recom-
mended minimum differential between the monitoring
pilot setting and the desired distribution pressure.
With settings as desired on both the monitoring and
the working pilots, tighten the locknuts to maintain
proper adjustment screw positions. Then re-adjust the
second-stage working regulator to the desired distribu-
tion pressure.
Shutdown
In any installation it is important to slowly open and
close the valves and to vent the outlet pressure before
venting the inlet pressure to prevent damage caused by
reverse pressurization of the pilot or main valve.
Single Pilot Regulators and Wide-Open
Monitor Regulators
As well as applying to a single-pilot regulator, the steps
in this procedure also are valid for a wide-open monitor-
ing installation and should be repeated for each regula-
tor in such an installation.
1. Close the upstream isolating valve.
2. Close block valve A in the supply line.
3. Close the downstream isolating valve.
4. If the downstream control line taps into the
pipeline above the downstream isolating valve,
open vent valve C between the regulator and the
downstream isolating valve. Permit all pressure to
bleed out of the regulator.
