Samson 3277 - Preloading the Springs; Tensioning the Springs

6-2 EB 8310-6 EN
Start-up
longer be correct. This may apply, for exam-
ple, to the conguration 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labels with incorrect or outdated infor-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.
Risk of actuator damage due to excessively
high or low tightening torques.
Observe the specied torques on tightening
actuator components. Excessively tightened
torques lead to parts wearing out quicker.
Parts that are not tightened far enough may
loosen.
Î Observe the specied tightening torques
(uAB0100).
Risk of actuator damage due to the use of
unsuitable tools.
Î Only use tools approved by SAMSON
(uAB0100).
6.1 Preloading the springs
Refer to Fig.6-1
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
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 bolts (A22) evenly
around the circumference.
2. Screw the long nuts (A23) together with
shims (A25) onto the clamping bolts
(A22) until they rest on the bottom dia-
phragm case (A2).
3. To tension the springs evenly, tighten the
nuts (A23) gradually in a crisscross pat-
tern until both diaphragm cases (A1, A2)
rest on the diaphragm (A4). Hold the
bolt head stationary with a suitable tool
and apply the tightening torque to the
nuts. Observe tightening torques.
4. Insert the short bolts (A20) through the
intended holes in the diaphragm cases
(A1, A2).
NOTICE
!
NOTICE
!
A1 Top diaphragm case
A2 Bottom diaphragm case
A4 Diaphragm
A20 Hex bolt
A21 Hex nut
A22 Hex bolt (preloading)
A23 Hex nut (preloading)
A24 Blanking plug
A25 Shim
A22
A23
A25
A24
A20
A25
A21
A1
A2
A4
Fig.6-1: Actuator with clamping nuts and bolts
NOTICE
!