FlowAct Diaphragm Linear Actuator FCD VLENIMFACTA4 10/16
46
Actuator without attachments
Spring-to-open
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. Disassemble the coupling parts and yoke (see page
54).
3. Disassemble the hexagon bolts (335), plain washers
(337) and hexagon nuts (351).
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 (202 - 389).
7. Carefully pull out the diaphragm-stem unit (211 - 374).
8. Remove the actuator springs (229).
9. Remove the spring adjusting plate (326) and distance
plate (231).
10. Remove the scraper rings (273) and O-rings (275).
11. Secure the diaphragm-stem unit into the Special Tool.
12. Loosen the stem (348) counterclockwise and remove
the lock washer (349), thrust washer (255), O-ring
(272), diaphragm (225), diaphragm plate (227), disk
(220), spacer bushing (228) and distance bushing (231).
13. Check stressed surface areas for damage such as
scoring 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.
14. Lubricate the new O-rings (275), new scraper rings
(273) with an appropriate lubricant and install into the
guide bushings (253).
15. Lubricate the new O-ring (272) with an appropriate
lubricant.
16. Lower the distance bushing (374), spacer bushing
(228), disk (220), diaphragm plate (227),
diaphragm (225), O-ring (272), thrust
washer (255) and lock washer (349)
onto the stem (211).
17. Lubricate the thread of the stem (211) with an appropri-
ate lubricant and install and finger tighten the stem (348).
18. Turn clockwise the stem (348) using a suitable torque
wrench.
19. Loosen and remove the diaphragm-stem unit (211-
374) from the Special Tool. Lubricate the actuator
stem with an appropriate lubricant.
20. Install and position the distance plate (231), spring ad-
justing plate (326) allowing the air connections to be
opposite of each other.
21. Install and align the actuator springs (229).
22. Carefully lower the diaphragm-stem unit (211- 374)
into the diaphragm casing.
23. Install the diaphragm casing (203), positioning the
casing such that the air connections are aligned.
24. Lubricate the threats of the long hexagon bolts (336)
with an appropriate lubricant then compress the springs
uniformly in a clockwise sequence by tightening the long
hexagon bolts (336), plain washers (337) and hexagon
nuts (351). Alternative method
see NOTICE
step 5.
25. Install the short hexagon bolts (335), hexagon nuts (351).
26. Tighten the nuts (351) using a crosswise pattern in
four steps.
