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b) Special version for
Series 250 Valves, DN 50 to
100/NPS 2 to 4
See Fig. 5-3 and Fig. 5-4
1. Fasten the travel indicator scale (84) with
hanger (83) and warning label (255), if
applicable, to the yoke using the screws
(82). While fastening it, position the trav-
el indicator scale (84) on the hanger (83)
according to Table 5-4.
2. Screw tight the holder (302) using the
screws (306) and washers (308). Ob-
serve the tightening torques specified in
Table 5-3.
3. Fasten the yoke (3) using the castellated
nut (92).
4. Use a soft-faced hammer or lever press
to press the sliding washers (309) (with-
out using any lubricant) into the holes of
the clamps (301) as far as they will go.
Remove any excess material.
5. Apply a thin film of lubricant (114) to the
threads of the stem (9) and screws (303).
NOTICE
!
Impaired functioning due to incorrectly ap-
plied lubricant.
Î Do not apply any lubricant to the threads
of the clamps (301) or the plug stem.
6. Position the clamps (301) and stem (9)
on the plug stem according to Table 5-4
and tighten screws (303) and washers
(304) by hand.
7. Mount the actuator. See section 5.3.2.
EB 8046 EN
8. Thread the stem (9) upwards until the
head of the stem rests on the extended
actuator stem.
9. Retract the actuator stem to relieve the
stem (9).
10. Gradually tighten the screws (303) in a
crisscross pattern. Observe the tightening
torques specified in Table 5-3.
Table 5-3: Tightening torques
Item
Screw size
306
M10
303
M8
11. Check and ensure the following:
− There is a nominal clearance of 0.5
to 1 mm between the sliding washers
and their contact surface on the yoke
on each side (see detailed view Y in
Fig. 5-4).
− The anti-rotation fixture does not get
stuck on the yoke and can move free-
ly in the direction of travel.
12. Extend the actuator stem again and
mount the stem connector clamps.
Installation
Tightening torque
[Nm]
30
15
5-7
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