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force applied to it. Release the spring
compression as described in step 2
of Actuator Maintenance and Balance
Diaphragm Replacement.
Disk or Pad Maintenance
1. Isolate the regulator and bleed downstream
pressure to atmosphere.
2. Remove bolts (key 22) and diaphragm
plate (key 30).
3. Unscrew locknut (key 54) with 19 mm socket and
remove the disc (key 43) and O-ring (key 42). No
need to remove the actuator or hold the stem during
maintenance. Inspect the disc for damage and
replace if needed. Replace O-ring and locknut from
the kit.
4. Reassemble in reverse order. Replace disk
(key 43) and tighten locknut (key 54). Install the
bottom flange (key 44) with O-ring (key 32) and
4 bolts (key 22).
5. During reassembly, check all O-rings (key 32) to
be certain they are in good condition; replace if
necessary. Lubricate the O-ring with elastomer
sealant and lubricant. Apply anti-seize compound
liberally to the adjusting screw threads (key 10), as
indicated in Figures 5 to 6.
Actuator Maintenance (Figures 5 to 6)
△
Ensure to take extra care during aligning
of bolt holes as threads of bolts will
damage the diaphragm.
1. Isolate the regulator and bleed downstream
pressure to atmosphere.
2. Remove closing cap (key 6), rotate the adjusting
screw (key 10) counterclockwise until there is no
compression on the control spring (key 13).
3. Remove cap screws (key 17) from the
actuator (key 2).
4. Lift the spring case (key 2) and set aside.
Remove the control spring (key 13) and spring
seat (key 12).
5. Unscrew locknut (key 15), remove the lower
spring seat (key 14). Then remove diaphragm
plate (key 5).
CAUTION
6. Diaphragm (key 4) should now be loose and can
be replaced.
7. Align bolt holes before tightening down locknut
(key 15).
8. Set diaphragm (key 4), diaphragm head (key 5)
and spring seat (key 14). Align bolts (key 17), lift
stem (key 37) and allow full assembly to settle
which aligns the balance diaphragm (key 28) and
main diaphragm. Once aligned with bolts, tighten
down locknut (key 15) to 25.1 ft-lb / 30 N∙m. Do
not overtighten.
9. During reassembly, ensure that all O-rings
(keys 24, 25, 33, 48, 47 and 57) are in good
condition; replace if necessary. Lubricate with
elastomer sealant and lubricant. Apply anti-seize
compound liberally to the adjusting screw threads
(key 10), as indicated in Figures 5 to 6.
Balance Diaphragm Replacement
1. Isolate the regulator and bleed downstream pressure
to atmosphere. Once pressure upstream and
downstream have bled to 0, manually trip the slam-
shut to release the spring energy in the trim.
2. Remove closing cap (key 6), rotate the adjusting
screw (key 10) counterclockwise until there is no
compression on the control spring (key 13).
3. If slam-shut is included, remove the slam-shut
mechanism from the body. Remove 4 bolts (key 224)
from the box and pull entire slam-shut off the body.
Careful of the O-ring seal between the body to
avoid damage. Set aside protecting the cam and
sealing surface.
4. Remove cap screws (key 17) from the
actuator (key 2).
5. Lift the spring case (key 2) and set aside.
Remove the control spring (key 13) and spring
seat (key 12).
6. Unscrew locknut (key 15), remove the lower
spring seat (key 14). Then remove diaphragm
plate (key 5).
7. Diaphragm (key 4) should now be loose and can
be replaced.
8. Remove the 4 intermediary flange screws (key 22)
and lift actuator assembly and trim out of the
body (key 1).
9. Carefully place the lower casing edge (key 3) on a
surface protecting the sealing area.
LS200 Series
11
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