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Start-up
WARNING
!
Risk of personal injury through incorrect
operation, use or installation as a result of
incorrect information on the actuator.
After any adjustment or conversion work, the
details on the actuator nameplate may no
longer be correct. This may apply, for exam-
ple, to the configuration ID or the symbol af-
ter reversal of the direction of action.
Î Immediately renew any nameplates or
labels with incorrect or outdated infor-
mation.
Î Add any new values to the nameplate. If
necessary, contact SAMSON to obtain a
new nameplate.
NOTICE
!
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specified torques when tighten-
ing actuator components. Excessive tighten-
ing torques lead to parts wearing out more
quickly. Parts that are not tightened far
enough may loosen.
Î Observe the specified tightening torques
(u AB 0100).
NOTICE
!
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON
(u AB 0100).
6-2
6.1 Spring compression
By preloading the springs in the actuator, the
following can be achieved:
− The thrust is increased (only actuators
with "stem extends")
− In combination with a SAMSON valve:
the actuator travel range can be adapted
to a smaller valve travel range
6.1.1
Tensioning the springs
NOTICE
!
Risk of actuator damage due to the springs
being tensioned unevenly.
Î Distribute clamping bolts and nuts evenly
around the circumference.
Î Tighten the nuts gradually in a crisscross
pattern.
1. Distribute the long clamping bolts evenly
around the circumference of the actuator.
2. Screw the long clamping nuts together
with washers onto the clamping bolts un-
til they rest on the bottom diaphragm
case.
3. To tension the springs evenly, tighten the
clamping nuts gradually in a crisscross
pattern until both diaphragm cases rest
on the diaphragm. Hold the bolt head
stationary with a suitable tool and apply
the tightening torque to the nuts. Ob-
serve tightening torques.
4. Insert the short bolts through the intend-
ed holes in the diaphragm cases.
EB 8317 EN
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