Samson 3351 - Relieving the Spring Compression in the Actuator

11-2 EB 8039 EN
Removal
11.2 Relieving the spring com-
pression in the actuator
a) DN15to80/NPS½to3
To relieve the compression of the springs in
theactuator,amountingxtureisrequired
(seeFig.11-1and'Tighteningtorques,lubri-
cants and tools' section in the annex).
Mountingxture
Washer
Spacer used for
disassembly
Fig.11-1:Mounting device (DN15 to 80)
1. Remove nuts and bolts at the actuator.
For versions with handwheel, turn the
handwheel to ensure that the spring plate
(5.6) is not under tension. Remove the di-
aphragm case (5.7) and take out the di-
aphragm.
2. Placeshim(around5mmthick)onthe
springplate(seeFig.11-1).Placeon
mounting device and fasten with three
clamping bolts and nuts. Turn the nuts
until the spring plate (5.6) is evenly load-
ed slightly. This causes the plug (3) to de-
tach itself from the seat.
3. Completelyundothethreadedbushing
(5.2). Spray the lock nut (3.2) stuck with
adhesive to the plug stem as well as the
ends of the plug stem with solvent. Use a
hot-air gun to soften the adhesive and
undo the lock nut (3.2). Position plug
wrench (see the 'Tightening torques, lu-
bricants and tools' section in the annex)
orhexscrewdriver(DN65/80)and
carefully turn the plug stem clockwise un-
til its height has changed by approx.
6mm.
4. Unthread the clamping bolts of the
mounting device and the plug stem grad-
ually until the plug stem is unscrewed out
of the spring plate (5.6). Remove spring
plate and spring. Unscrew lock nut (3.2).
b) DN100/NPS4
The long clamping bolts with long clamping
nuts and the short bolts with short nuts are
arranged evenly around the circumference of
the actuator housing to fasten the top and
bottom diaphragm cases together. The
springs in the actuator are compressed using
the long clamping nuts and bolts.
To relieve the compression of the springs in
the actuator, proceed as follows:
1. Unthread and remove the short nuts and
bolts (including the washers) on the dia-
phragm cases.
2. Loosen the long clamping nuts and bolts
on the diaphragm cases evenly in a
crisscross pattern to gradually relieve the