Samson 3251-E - Mounting the External Anti-Rotation Fixture; A) Standard Version for Valve Size NPS 6 and Larger

5-4 EB 8052-E EN
Installation
5.3.1 Mounting the external
anti-rotation xture
Before mounting the actuator, the external
anti-rotation xture must be mounted onto
the plug or piston stem in some cases. The
valve must be closed beforehand.
For SAMSON Type3271 and Type3277
Actuators with Type3273 Hand-operated
Actuator, observe the mounting and operat-
ing instructions of the hand-operated actua-
tor (handwheel) to mount the anti-rotation
xture uEB8312-X.
a) Standard version for valve
size NPS6 and larger
See Fig.5-1 and Fig.5-2
1. Insert ball bearings (310) into the recess-
es in the bonnet.
2. Place the yoke (3) on the bonnet in such
a way that the ball bearings t into the
recesses of the yoke.
3. Fasten the yoke (3) using the castellated
nut (92).
4. Fasten the hanger (83) and warning la-
bel (255), if applicable, to the yoke us-
ing the screws (82).
5. Position the travel indicator scale (84) on
the hanger (83) with the screws (85) ac-
cording to Table 5-4.
6. Use a soft-faced hammer or lever press
to press the sliding washers (309) with
their beveled part rst (without using any
lubricant) into the recesses of the clamps
(301) as far as they will go. Remove any
excess material.
7. Apply a thin lm of lubricant (114) to the
threads of the stem (9) and screws (303).
Impaired functioning due to incorrectly
applied lubricant.
Î Do not apply any lubricant to the threads
of the clamps (301) or plug/piston stem.
8. Position the clamps (301) and stem (9)
on the plug or piston stem according to
Table 5-4 and tighten screws (303) and
washers (304) by hand.
9. Mount the actuator. See section5.3.2.
10. Thread the stem (9) upwards until the
head of the stem rests on the extended
actuator stem.
11. Retract the actuator stem to relieve the
stem (9).
12. Gradually tighten the screws (303) in a
crisscross pattern. Observe the tightening
torques specied in Table 5-2.
Table 5-2: Tightening torques
Screw size Tightening torque
[Nm]
M12 50
M16 121
13. Check and ensure the following:
− There is a nominal gap of 0.5 to
1mm between the sliding washers
and their seating surface on the yoke
3
83
82
82
310310
92
84
85
255
Legend
3 Yoke
82 Screws
83 Hanger
84 Travel indicator scale
85 Screws
92 Castellated nut
255 Warning label
310 Ball bearing
Plug or piston
stem
Fig.5-1: Overview of yoke assembly with travel indicator scale in the standard version
NOTICE
!