EB 8140 EN
31
Servicing
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).
18. 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.
19. Place the bottom slip washer (5.2) on the
valve bonnet (3).
20. 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).
21. Screw tight the retaining screw (4.2) at
the side to fix the threaded bushing in
place.
22. Place the spring (9) together with the
washer (9.1) onto the actuator base (5).
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 dome
(7.1) and fasten them tight onto the actu-
ator base (5) by tightening the top
screws (6) gradually in a crisscross pat-
tern.
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.
7.3 Tightening torques
Table 4:
Tightening torques for body nuts
(1.1)
Valve size
Tightening torque
DN 15 to 25 (M10)
30 Nm
DN 32 to 50 (M12)
50 Nm
DN 65 and 80 (M16)
100 Nm
