Flowserve Valtek FlowTop V750 User Instructions page 17

Valtek FlowTop
Figure 10: Disassemble / Reassemble the valve
Item Part
1 Body
20 Seat ring
(40) Bonnet
55 Profile ring
Table 12: Valve parts
14. Install the new packing.
For details, see the associated packing
NOTICE
variant (see Page 17 - 19). Install and
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.
15. 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.
16. Finish packing follower (80) tightening with a wrench
FCD VLEEIM1485-04 (EN/A4) November 2022
114
Bonnet
58
20
55
108
1
Item Part
58 Bonnet gasket
108 Stud bolt
114 Hex nut
(See Table 7, Page 10, 19 - 20).
17. Replace the pneumatic diaphragm actuator and acces-
sories (See page 21).
18. 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.
19. Log the maintenance interval and the work performed.
Standard and Extension Bonnet design -
disassembly instructions
1. Remove the plug assembly (50) from the bonnet (40).
2. To disassemble the packing assembly, switch to the
relevant description (see Page 19 - 20).
Figure 11: Disassemble / Reassemble the bonnet
Item Part
40 Bonnet
50 Plug
Table 13: Bonnet parts
Packing
40
51
52
50
Item Part
51 Stem
52 Lock bushing
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