Pilot Adjustment - Emerson Tartarini FL Series Instruction Manual

• Block valves isolate the regulator
• Vent 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.
CauTiOn
Be sure to slowly introduce pressure
into the system to prevent downstream
overpressure due to potential rapid
pressure increase. Pressure gauges
should always be used to monitor
downstream pressure during startup.
Procedures used in putting this
regulator into operation must be planned
accordingly if the downstream system is
pressurized by another regulator or by a
manual bypass.
When using a Type Sa/2 pilot supply
filter regulator, the differential pressure
across the regulator must be at least
45 psid (3,1 bar d) for optimum regulator
performance. The Type Sa/2 can be
removed if differential pressure across
the regulator is less than 45 psid
(3,1 bar d) and inlet pressure stays at
or below 200 psig (13,8 bar).
Startup
1. Make sure all block valves, vent valves, and
control line valve(s) are closed.
2. Back out the pilot adjusting screw(s).
3. Slowly open the valves in the following order:
a. Pilot supply and control line valve(s), if used.
b. Inlet block valves.
4. Crack open the outlet block valve or bypass valve
to allow minimum flow.
5. For a single regulator, set the pilot to the
desired outlet (control) pressure according to the
Pilot Adjustment procedure.
For a wide-open downstream monitor installation,
adjust the upstream working pilot until intermediate
pressure is higher than the desired setpoint of the
monitor pilot. Adjust the downstream monitoring pilot to
the desired monitoring takeover pressure. Reduce the
upstream pilot to the normal outlet pressure setting.
note
For a wide-open upstream monitor installation,
adjust the downstream working pilot to a setpoint
higher than the setpoint of the monitor pilot. Adjust
the upstream monitoring pilot to the desired monitoring
takeover pressure. Reduce the downstream pilot to
the normal outlet pressure setting.
For a working monitor installation, adjust the
setpoint of the upstream monitor pilot to the desired
maximum pressure. Adjust the upstream working pilot
to the desired intermediate pressure setting. Adjust
the downstream pilot to a pressure setting slightly
above the upstream monitor pilot pressure setting.
Adjust the upstream monitor pilot to its desired
setpoint. Establish final desired downstream pressure
by adjusting the downstream working regulator pilot.
6. After adjusting the Type PRX pilot(s) to the desired
pressure setting(s), slowly open the downstream
block valve wide-open.
7. Close the bypass valve, if used.

Pilot adjustment

For PRX Series pilots (Figure 8), loosen locknut
(key 2) and turn the adjusting screw into the spring
case to increase (or out of the spring case to
decrease) the downstream pressure. When the
required downstream pressure is maintained for
several minutes, tighten the locknut to lock the
adjusting screw in position.
Type PRX Pilot Restrictor and Damper
Screw adjustment
Recommended initial setting of the
restrictor screw is turned completely in
(clockwise) and then turned out 1/2 turn.
The damper screw initial setting is turned
completely out (counterclockwise).
The Type PRX/125 (upstream monitor
pilot in working monitor installations)
does not have a restrictor screw.
The Restrictor and Damper screws on the PRX Series
pilot control the regulator's proportional band (droop)
and speed of response. For additional tuning follow
the steps outlined below:
1. Start with the restrictor screw 1 turn
counterclockwise from fully seated (turn restrictor
FL Series
note
note
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