EB 8140 EN
25
Servicing
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.
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).
11. Press the threaded bushing (4) out of the
actuator base (5). Replace the slip wash-
ers (5.2) with new ones.
12. Pull the actuator/plug stem (2) down out
of the valve bonnet (3).
13. Pull all the packing parts out of the pack-
ing chamber using a suitable tool. Clean
the packing chamber thoroughly. Renew
the packing.
14. Slide the plug/actuator stem (2) into the
valve bonnet (3).
15. 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)
16. Place the top slip washer (5.2) into the
actuator base (5).
17. Push the threaded bushing (4) into the
actuator base (5). Make sure that the
O-ring (5.3) is correctly seated in the
threaded bushing.
18. Place the bottom slip washer (5.2) on the
valve bonnet (3).
19. Screw the threaded bushing (4) together
with the actuator base (5) over the plug/
actuator stem (2) onto the valve bonnet
(3).
Tighten the threaded bushing only to the
point where the actuator base (5) can
still rotate on the slip washers (5.2).
20. Screw tight the retaining screw (4.2) at
the side to fix the threaded bushing in
place.
21. Slide the washer (8.3) and O-ring (8.2)
onto the plug/actuator stem (2).
22. Place on the piston (8) with piston ring
(8.1) and washer (12).
23. Insert the washer (9.1) and spring (9) in-
to the piston (8).
24. 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.
25. Fasten the travel indicator (10).
26. 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.
27. Replace the body gasket (3.1). See sec-
tion 7.1.
28. Place the valve bonnet (3) with plug (2)
onto the body (1).
29. Tighten the body nuts (1.1) gradually in
a crisscross pattern. Observe tightening
torques.
