FL Series
7
• Hand valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
Introduce pilot supply pressure into the
regulator before introducing any down-
stream pressure, or internal damage
may occur due to reverse pressurization
of the pilot and main valve components.
Always use pressure gauges to monitor
downstream pressure during startup. If
the downstream is pressurized by
another regulator, plan startup proce-
dures accordingly.
Note
Pilot supply pressure must exceed
control pressure by at least 15 psig
(1,0 bar) in order to operate the regula-
tor at rated travel.
Although remote loading or control constructions may
require separate adjustments on associated equipment,
the only adjustment normally necessary on a
Type FL-PRX regulator is the pressure setting of the
pilot control spring. Turning the adjusting screw
clockwise into the spring case increases the spring
compression and pressure setting. Turning the adjust-
ing screw counterclockwise decreases the spring
compression and pressure setting.
Pilot Adjustment
To adjust a standard Type PRX pilot, loosen the
locknut, and turn the adjusting screw. Then tighten the
locknut to maintain the adjustment position.
Startup
This procedure is to be repeated in turn for each
regulator in the installation.
1. Slowly open the hand valve in the pilot supply line.
2. Slowly open the upstream block (isolating) valve
and partially open the downstream block valve for
minimum flow.
3. Slowly open the hand valve in the control line
while, at the same time, adjusting the pilot setting if
necessary.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
Working Monitor Regulator
Installation
All Type FL working monitor regulators are bench set at
the factory according to the service conditions specified
on the customer’s order. Examine the unit on arrival to
make sure no damage has occurred in shipment. Clean
and blow out pipelines to be sure no welding slag or
other foreign material is present.
Install the Type FL into the pipeline using adequate
gaskets for flanged regulator units and good piping
technique. Be sure to provide suitable pressure gauges
where appropriate, block valves, bypass valves and
piping, and bleed valves to permit safe and easy
maintenance of both the working monitor regulator and
the second-stage working regulator. Be sure flow will be
in the direction indicated by the arrow cast on the body
Refer to the figure 3 schematic and figure 4, and
proceed in the following steps.
1. Attach the intermediate pressure control line
(1/2-inch NPT pipe) between the 1/2-inch NPT pipe tee
and the intermediate pressure portion of the down-
stream piping. Install hand valve B in this line.
2. Connect 1/2-inch NPT distribution pressure
control line piping between the 1/2-inch NPT connec-
tion in the mounting bracket and the pipeline down-
stream of the second-stage working regulator. Include
hand valve A in this control line.
Note
Each pilot has a nameplate identifying it
as the working or monitor pilot.
3. Pipe the pilot supply line to 1/4-inch NPT connec-
tion in the back of the working pilot body. Supply
pressure should be filtered if excess dirt or condensate
is present in the supply gas.
4. Install downstream working regulator per guide-
lines.
