Maintenance - Emerson Tartarini FL Series Instruction Manual

The Restrictor and Damper screws on the PRX Series
pilot control the regulator's proportional band (droop)
and speed of response. To tune, follow the steps
outlined below:
1. Start with the restrictor screw 1 turn
counterclockwise from fully seated (turn restrictor
fully clockwise then 1 turn counterclockwise) and
the damper screw fully counterclockwise.
2. Turn damper screw clockwise until desired
performance is achieved. This reduces the flow path
of the damper. If the damper becomes fully seated
(no longer able to turn clockwise) and the desired
performance has not been achieved, return the
damper screw to the fully counterclockwise position.
3. Turn the restrictor screw an additional turn
counterclockwise from fully seated. This increases
the flow path of the restrictor. If additional tuning
is required, repeat step 2. Follow this method until
desired performance is achieved.
Shutdown
CaUTiOn
if the pilot bleed control line pressure is
shut down first, the downstream system
may be subjected to full inlet pressure.
1. If the pilot setting must be disturbed, be sure to
keep some tension on the spring. This will prevent
trapping inlet pressure during blow down.
2. Slowly close the valves in the following order:
a. Inlet block valve
b. Outlet block valve
c. Control line valve(s), if used.
3. Open the vent valves to depressurize the system.

Maintenance

The regulator parts are subject to normal wear
and must be inspected periodically and replaced
as necessary. The frequency of inspection and
replacement depends on the severity of service
conditions and on applicable federal, state and local
codes and regulations.
WaRning
!
To avoid personal injury or property
damage from sudden release of pressure,
isolate the regulator from the pressure
system and release all pressure from the
pilot and main valve before performing
maintenance operations.
To prevent personal injury or damage
to the equipment during storage,
installation or maintenance operations,
proper supports shall be used to keep
the Type FL Regulator from rolling while
it is sitting on a flat surface.
Main Valve (Refer to Figure 4)
Main Valve Pad/Disk Replacement
1. Disconnect the control lines from the regulator.
Pressurize the loading chamber in the regulator
with 15 psig / 1.0 bar. This will force the spring
back and make it easier to work on the regulator.
2. Remove outlet flange (key 22) by removing socket
head cap screws (key 5).
3. Remove pad/disk holder assembly and O-ring
(key 18). For NPS 8 and 10 / DN 200 and 250,
the pad/disk holder remains attached to the outlet
flange and no dismounting is necessary.
4. Remove pad/disk (key 20) from pad/disk holder
(key 19) by removing cap screw (key 25) and pad/
disk retainer (key 21), replace pad/disk if necessary.
5. Reinstall the pad.
6. Reassemble in reverse order. Refer to Table 2 for
torque values. Tighten all bolts using a star pattern
and repeat 2 to 3 times to ensure proper torque.
7. Then bleed off the pressure from the
loading chamber.
8. Reconnect all of the control lines.
Main Valve Diaphragm Maintenance
1. Place main valve with inlet side up.
2. Remove the travel indicator assembly by removing
the indicator cover (key 40) and O-ring (key 35).
Please see the Travel Indicator Maintenance section
on page 12 for the complete maintenance procedure.
3. Remove inlet flange (key 1) by removing socket
head cap screws (key 5). Due to force created by the
spring (key 6), take care when removing inlet flange.
4. Lift out spring (key 6). Remove hex head cap
screws, washers and nuts (keys 9, 14 and 15).
Lift off the inlet cover (key 11).
5. Remove diaphragm assembly by removing screws
(key 27) to separate the outlet and the inlet plates
(keys 12 and 8). Check diaphragm (key 10) and
Type FL
11