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FlowAct Diaphragm Linear Actuator FCD VLENIMFACTA4 10/16
18
Actuator without attachments
Spring-to-close
Disassembly instruction of the actuator subas-
sembly
NOTICE
Limit disassembly only to necessary compo-
nents.
1. Fix the actuator on the assembly table, if this is not
already happened.
2. Loosen the lock nut (344) counterclockwise and disas-
semble the upper coupling (249) and lock nut clock-
wise (see page 15).
3. Disassemble the short hexagon bolts (335), plain wash-
ers (337), hexagon nuts (351) and ring nuts (209).
4. Pull off the protection sleeve (339).
WARNING
Risk of injury by jump-
ing out parts ! Pre-loaded
springs inside.
5. Lubricate the threads and loosen the long hexagon bolts
(336), plain washers (337) and hexagon nuts (351) uni-
formly in a clockwise sequence as the springs expand.
NOTICE
We recommend using threaded bolts
meeting standards from ISO 898-1,
8.8 or higher, as well as washers and nuts.
6. Lift off the diaphragm casing (203), distance plate
(231) and spring adjusting plate (326).
7. Remove the actuator springs (229).
8. Carefully remove the diaphragm-stem unit (211 - 349).
9. Remove the scraper ring (273) and O-ring (275).
10. Secure the diaphragm-stem unit into the Special Tool.
11. Loosen the special nut (348) counterclockwise and
remove the lock washer (349), spacer bushing (228),
diaphragm plate (227), diaphragm (225), O-ring (272)
and thrust washer (255).
12. Check stressed surface areas for damage such as scor-
ing and deformities. Use a brass brush or similar tool to
clean bolting. Check for corrosion or any other damage.
Reassembly instruction of the actuator subas-
sembly
NOTICE
Always replace parts showing wear with
new parts.
13. Lubricate the new O-ring (275), new scraper ring (273)
with an appropriate lubricant and install into the guide
bushing (253).
14. Lubricate the new O-ring (272) with an appropriate
lubricant.
15. Lower the thrust washer (255), diaphragm (225), O-
ring (272), diaphragm plate (227), spacer
bushing (228), lock washer (349)
onto the stem (211).
16. Lubricate the thread of the stem (211) with an appro-
priate lubricant and install and finger tighten the spe-
cial nut (348).
NOTICE
The diaphragm plate should be posi-
tioned to the diaphragm with the aid
of the Positioning Template. Mark the position.
17. Turn the special nut (348) clockwise using a suitable
torque wrench.
18. Loosen and remove the diaphragm-stem unit (211-
349) from the Special Tool. Lubricate the actuator
stem with an appropriate lubricant.
19. Carefully lower the diaphragm-stem unit (211- 349)
into the diaphragm casing.
NOTICE
Position the diaphragm-stem unit
such that the air connection and the
Mark align.
20. Install and align the actuator springs (229).
21. Install and positioning the spring adjusting plate (326)
such that the drilling, mark and air connection match.
22. Install the distance plate (231) and diaphragm casing
(203), positioning the casing such that the drilling,
mark and air connections match.
23. Lubricate the threats of the long hexagon bolts (336)
with an appropriate lubricant then compress the springs