28
EB 8140 EN
Servicing
23. Slide the piston (8) with piston ring (8.1)
over the plug/actuator stem (2).
24. Place on the O-ring (8.2) and washer
(12).
25. Tighten the nut (11) intended for fasten-
ing the piston, while holding the plug/
actuator stem (2) stationary at the flat
-
tened part with an open-end wrench.
26. Fasten the travel indicator (10).
27. Put on actuator housing (7) and fasten it
tight onto the actuator base (5) by tight-
ening the screws (6) gradually in a criss-
cross pattern.
28. Replace the body gasket (3.1). See sec-
tion 7.1.
29. Place the valve bonnet (3) with plug (2)
onto the body (1).
30. Tighten the body nuts (1.1) gradually in
a crisscross pattern. Observe tightening
torques.
7.2.2
DN 65 and 80
Fail-close (FA/NC)
1. Undo the body nuts (1.1) gradually in a
crisscross pattern.
2.
Lift the valve bonnet (3) together with the
plug (2) off the body (1).
3. Undo the top screws (6) gradually in a
crisscross pattern.
4.
Lift off the dome (7.1) and actuator hous
-
ing (7).
5.
Lift off the spring (9).
6. Remove the travel indicator (10).
7. Use a socket wrench to unscrew the nut
(11) from the plug/actuator stem, while
holding the plug/actuator stem (2) sta-
tionary at the flattened part with an
open-end wrench.
8. Remove the washer (12), piston (8) and
piston ring (8.1).
9. Remove the O-ring (8.2) and washer
(8.3) from the plug/actuator stem (2).
10. Unscrew the retaining screw (4.2) at the
side using a 2 mm hex screwdriver.
11. Unscrew the threaded bushing (4) to-
gether with the actuator base (5) from
the valve bonnet (3) using an open-end
wrench (width across flats 41).
12. Press the threaded bushing (4) out of the
actuator base (5). Replace the slip wash-
ers (5.2) with new ones.
13. Pull the actuator/plug stem (2) down out
of the valve bonnet (3).
14. Pull all the packing parts out of the pack-
ing chamber using a suitable tool. Clean
the packing chamber thoroughly. Renew
the packing.
15. Slide the plug/actuator stem (2) into the
valve bonnet (3).
16. Carefully slide the packing parts over the
plug/actuator stem into the packing
chamber using a suitable tool. Keep the
correct sequence:
−
Spring (4.5)
−
Washer (4.3)
−
V-ring packing (4.4)
17. Place the top slip washer (5.2) into the
actuator base (5).
