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15. Install the new packing.
NOTICE
push two packing rings consecutively using the Tamp-
ing Tool and pre-tighten it. Repeat the procedure with
remaining rings. Rotate each ring 180° from the over-
lapping point. Make sure each ring is clean. Dirty rings
result in stem leakage.
16. Tighten the bonnet nuts (114) in four steps - 30%,
60%, 100%, and all around 100% - using a crosswise
pattern (See Section 14: Torque Requirements).
NOTICE
inch) between tightenings. Loosen the bolted connection
and start again if it proves difficult to move the plug.
17. Finish packing follower (80) tightening with a wrench
(See Table 7, Page 10, 19 - 20).
18. Replace the pneumatic diaphragm actuator and acces-
sories (See page 21).
19. After reinstalling the control valve in the pipeline,
perform 3 full strokes and check the tightening of the
packing follower and bonnet bolting.
NOTICE
higher friction and reduce product service life.
20. Log the maintenance interval and the work performed.
Screwed seat ring design - disassembly
instructions of the valve body assembly
1. Turn the bonnet nuts (114) counter clockwise to loosen.
2. Place the Ring Nut Tool (See Section 16: Special Tools)
on the stem (51) then slowly lift the bonnet assembly
(40) upwards out of the body (1).
WARNING
the control valve involves personal physical risk by
falling parts.
Please exercise caution.
16
FCD VLEEIM1485-04 (EN/A4) November 2022
For details, see the associated packing
variant (see Page 19 - 20). Install and
Check the plug's freedom of movement
by lifting it approximately ~10 mm (0.4
Do not over tighten the packing. Over
tightened packing may produce
Crushing hazard ! Lifting
the bonnet and plug from
Exercise care with a pressure bal-
NOTICE
anced plug design. While removing
the pressure balanced plug, the retainer may stick to
the bonnet then become detached while lifting the plug
and stem out of the valve. Secure the seat retainer as
you remove the plug and stem.
3. Remove the bonnet gasket (58).
4. Remove the seat ring (20) and profile ring (55).
Do a visual inspection. Only remove
NOTICE
parts that are to be replaced.
5. Check stressed surface areas for damage such as
scoring and deformities.
6. To disassemble the bonnet assembly, switch to the rel-
evant description.
7. Use a standard brass scraper or other suitable tool to
clean bolting. Check for corrosion or any other damage.
Screwed seat ring design - reassembly
instructions of the valve body assembly.
8. Lubricate all bolt and screw threads and bearing sur-
faces (stem, underside of the nuts) with a suitable, ap-
proved lubricant (See Section 15: Lubricants).
Never allow lubricants to come in contact
NOTICE
with the bonnet or sealing surfaces.
9. Install a new profile ring (55) and seat ring (20) if pre-
viously disassembled.
10. Lower the plug assembly (50) into the body with the
plug touching the seat ring surface.
For details, see the associated bonnet
NOTICE
variant (see Page 17 - 19).
11. Install the new bonnet gasket (58).
12. Carefully lower the bonnet (40) onto the plug in the
body of the valve.
13. Install and finger tighten the bonnet nuts (114) to the
bonnet bolts (108).
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