Flowserve Valtek FlowTop V750 User Instructions page 15

Valtek FlowTop
Clamped 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.
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) and seat retainer gas-
ket (56).
4. Remove the seat retainer (30), seat ring (20) and pro-
file ring (55).
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.
Clamped 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).
10. Lower the seat retainer (30) into the body and place it
on top of the seat ring (See Figure 9).
FCD VLEEIM1485-04 (EN/A4) November 2022
Crushing hazard ! Lifting
the bonnet and plug from
11. 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).
12. Install the new seat retainer gasket (56) and the new
bonnet gasket (58).
13. Carefully lower the bonnet (40) onto the plug in the
body of the valve (See right column for pressure bal-
anced trim).
14. Install and finger tighten the bonnet nuts (114) to the
bonnet bolts (108).
Figure 9: Disassemble / Reassemble the valve
Item Part
1 Body
20 Seat ring
30 Seat retainer
(40) Bonnet
55 Profile ring
Table 11: Valve parts
114
Bonnet
58
56
30
20
55
108
1
Item Part
56 Seat retainer gasket
58 Bonnet gasket
108 Stud bolt
114 Hex nut
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