Flowserve Valtek FlowTop V746 User Instructions page 15

18. Install the new seat retainer gasket (56) and the new
bonnet gasket (58).
19. Carefully lower the bonnet (40) onto the plug in the
body of the valve (See right column for pressure bal-
anced trim).
20. Install and finger tighten the bonnet nuts (114) to the
bonnet bolts (108).
21. Install the packing box ring (93) and the new packing
(88).
Install and push two packing rings
NOTICE
consecutively using the Tamping
Tool and pre-tighten it. Repeat the procedure with re-
maining rings. Rotate each ring 180° from the overlap-
ping point. Make sure each ring is clean. Dirty rings
result in stem leakage.
There are different versions - for details see Parts
List - Packing Details (see Page 19).
22. Install the upper guide (87), Belleville springs (138)
and the packing follower (80). Tighten the packing fol-
lower with your fingers clockwise until resistance can
be felt.
The belleville springs (138) must be
NOTICE
stacked in series.
23. Tighten the bonnet nuts (114) in four steps - 30%,
60%, 100%, and all around 100% - using a crosswise
pattern (See Section 14: Torque Requirements).
Check the plug's freedom of movement
NOTICE
by lifting it approximately ~10 mm (0.4
inch) between tightenings. Loosen the bolted connection
and start again if it proves difficult to move the plug.
24. Finish packing follower (80) tightening with a wrench
(See Table 7, Page 9).
25. Replace the pneumatic diaphragm actuator and acces-
sories (See page 13).
26. After reinstalling the control valve in the pipeline,
perform 3 full strokes and check the tightening of the
packing follower and bonnet bolting.
Do not over tighten the packing. Over
NOTICE
tightened packing may produce
higher friction and reduce product service life.
27. Log the maintenance interval and the work performed.
Valtek FlowTop General Service Valve
Bonnet version with a pressure balanced trim:
28. Lubricate all bolt and screw threads and bearing sur-
faces (stem, underside of the nuts) with a suitable,
approved lubricant (See Section 15: Lubricants).
NOTICE
29. Reassemble the pressure balanced plug with new backup
rings (66) and a new O-ring (65) (See Figure 10).
30. Install a new profile ring (55) and seat ring (20).
31. Lower the sleeve (30) into the body and place it on top
of the seat ring (20).
32. Lower the pre-assembled plug assembly (50) into the
sleeve (30) with the plug head touching the seat ring.
33. Install the new seat retainer gasket (56) and the new
bonnet gasket (58).
34. Lower the bonnet (40) onto the stem (51) of the plug
assembly (50) in the body of the valve.
35. Continue with the standard procedure in the chapter 20.
Disassembly of the valve with a Bellows Seal
Bonnet Assembly.
1. Turn the bonnet nuts (114) counter clockwise to loosen
(See Figure 11: Disassemble / Reassemble the valve
with bellows seal bonnet type A).
2. Turn the packing follower (80) counter clockwise to
loosen.
3. Remove the Belleville springs (138).
FCD VLENIM8610A4 11/18
Never allow lubricants to come in contact
with the bonnet or sealing surfaces.
51
66
65
66
52
50
56
30
Figure 10: Pressure balanced design
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