Europe,
Middle
East,
and
Africa
Only
Type FL
13
FL and mFL Regulator General maintenance
a. Disconnect all fittings, remove regulator from the line and
place it in upward vertical position.
b. Mark the position of inlet and outlet flanges (keys 1 and
22 or 200 for the widened outlet and SRS versions) and
cover (keys 11 and 13) to keep the correct alignment
during the following reassembly phase.
c. Separate covers (keys 11 and 13) by removing screws
(key 9).
!
WaRNING
Spring (key 6) is compressed between
covers (keys 11 and 13); its sudden release
could cause them to fly apart dangerously.
To prevent this, replace the two screws
(key 9) with threaded rods and their nuts,
remove the remaining screws and use nuts
to slowly release spring tension.
d. Slide sleeve-diaphragm assembly (keys 16 and 10) out of
inlet cover (key 11) and remove indicator (key 34).
e. Loosen screws (key 27), axially slide out of sleeve
(key 16) plates (keys 8 and 12) and diaphragm (key 10).
Replace O-rings (keys 26 and 28).
f. Loosen screws (key 5 or 64 for DN 150 and DN 200
sizes) and dismount inlet flange (key 1). Replace anti-
friction rings (key 2) and O-ring (key 3).
g. Unscrew travel indicator support (key 36) from inlet cover
(key 11), dismount parts, replace O-rings (keys 35 and
37) and O-ring (key 4) on the inlet cover (key 11).
h. Loosen screws (key 5) and axially slide out outlet flange
(key 22 or 200 for the widened outlet and SRS versions).
Replace O-ring (key 18), anti-friction rings (key 2) and
O-ring (key 3).
i. Remove pad holder (key 19) from the outlet cover
(key 13). Only for the DN 200 size the pad holder remain
attached to the outlet flange and it is not necessary
dismount it.
l. Loosen screw (key 25), pad retainer (key 21), remove and
replace pad unit (key 20).
m. Check that the part of sleeve (key 16) that touches pad
unit (key 20) is intact. If not replace sleeve.
n. Check all moving parts, paying special attention to nickel
plated surfaces. Replace any that are worn or damaged.
o. Clean all stripped-down parts with petrol and dry with
compressed air.
Reassembly
Lubricate all seals with MOLyKOTE 55 M, being very careful
not to damage them when reassembling. Reassemble the
parts by reversing the above steps.
As you proceed, make sure that parts move freely and
without friction.
In addition:
a. Before fitting sleeve-diaphragm assembly (keys 16 and
10), recompose indicator group (keys 34, 35, 36, 37,
38 and 40) and mount it on inlet cover (key 11). Attach
spring collet (key 33) to plate (key 8) upon completion of
reassembly.
Don’t execute this assembly for the
DN 200 size.
b. Complete reassembly and make sure to tighten all
screws uniformly.
c. Remove cap (key 40) and tap with a rubber or wooden
hammer indicator (key 34) so as to couple spring collet
(key 33) and plate (key 8).
Only for DN 200 size insert indicator (key 34) and hook it
to plate (key 8), recompose indicator group (keys 35, 36,
37, 38 and 40) and mount it on inlet cover (key 11).
d. Use an air pump connected to fitting (key 7) to check
proper regulator working order.
e. After the reassembly completion, check the proper
functioning of all parts. Check the regulator with soapy
water, making sure there are no leaks.
f. Remount regulator on the line and reestablish
all connections.
MFL and MFL-BP Versions
The MFL/ configuration consists of two FL/ and the MFLBP/
of two FL-BP/ regulators; in each the inlet regulator acts as a
monitor and the outlet as a regulator proper.
Monitor outlet flange and regulator inlet flange are one-piece
the stub pipe (key 41).
For the maintenance procedures see previous paragraphs.
BFL Regulator and Slam-shut
General
maintenance
a. Disconnect all fittings, remove regulator from the line and
place it in upward vertical position.
b. Mark the position of outlet flanges (key 22 or 200 for the
widened outlet and SRS versions) among cover (key 13),
of the inlet flange (key 100) among stub pipe (key 190)
and of the stub pipe (key 190) among cover (key 11),
to keep the correct alignment during the following
reassembly phase
c. Separate covers (keys 11 and 13) by removing screws
(key 9).
!
WaRNING
Spring (key 6) is compressed between
covers (keys 11 and 13); its sudden release
could cause them to fly apart dangerously.
