Flowserve Valtek FlowTop V750 User Instructions page 21

Valtek FlowTop
Reassemble the actuator and positioner
onto the valve:
1. Mount the pneumatic diaphragm actuator onto the
bonnet and tighten the yoke lock nut (76) clockwise
(see Section 14: Required Torques).
Position the actuator with the vent
NOTICE
plug positioned at the rear.
2. Move the actuator to the open position.
3. Screw in the lock nut (113) and actuator coupling (345)
and adjust the distance between the valve coupling
(345) and actuator coupling (249) by adjusting the
stroke length.
Size
1/2" - 2"
3" - 4"
6"
Table 20: Stroke adjustment length
4. Adjust the valve coupling (345) until the actuator
coupling (249) lines up.
Press the stem / plug into the seat by
NOTICE
hand.
5. Move the actuator to the close position and install the
cap screws (240).
6. Secure the lock nut (113). Keep actuator coupling
(249) from turning by securing with a wrench.
7. Reassemble the positioner on the valve as necessary
(see relevant accessory User Instruction).
8. Connect the valve into the pipeline (See Section 9:
Installation).
9. After reinstalling the control valve into the pipeline,
perform three full strokes and check the tightness of
the packing follower and bonnet bolting (See Section
10: Valve Quick-Check).
10. Log the maintenance interval and the work performed.
FCD VLEEIM1485-04 (EN/A4) November 2022
Stroke
20 mm 0.787 in.
+ 0,5 + 0.02
mm 1.574 in.
40
+ 0,5 + 0.02
60 mm 2.362 in.
+ 0,8 + 0.03
249
Figure 20: Reassemble the actuator
Item Part
76 Actuator Lock Nut
113 Lock Nut
240 Socket Head Screw (2x)
Table 21: Coupling parts identification
Figure 21: Reassemble the positioner
240
345
76
113
Item Part
249 Actuator Coupling
345 Valve Coupling
O-ring
Positioner
Socket
screw
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