Samson 3271, Монтаж и эксплуатация, Страница: 22 / 36

22 EB 8310-8 EN
Mounting and start-up
9. Screw on the stem connector nut by hand
until it touches the actuator stem (A7).
10. Turn the stem connector nut a further
quarter turn and secure this position with
the lock nut.
11. Position clamps of the stem connector
(A26/27) and screw them tight.
12. Align the travel indicator scale with the
tip of the stem connector clamp.
5.2 Preloading the springs
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
Actuators that have already been preloaded
by SAMSON without mounting the valve are
labeled correspondingly.
Additionally, they can be identified by the
longer bolts with nuts protruding from the
top and bottom diaphragm cases. The bolts
allow the springs to be relieved or tensioned
evenly.
5.2.1 Tensioning the springs
Risk of actuator damage due to the springs
being tensioned unevenly.
−
Distribute clamping bolts and nuts evenly
around the circumference of the top and
bottom cases.
−
Tighten the nuts gradually in a crisscross
pattern.
1. Distribute the long bolts (A22) together
with washers (A25) evenly around the
circumference of the top and bottom cas
-
es (A1, A2).
2. Screw the long nuts (A23) onto the
clamping bolts (A22) until they rest on
the diaphragm case.
3. To tension the springs evenly, tighten the
nuts (A23) gradually in a crisscross pat -
tern. Hold the bold head stationary with
a suitable tool and apply the tightening
torque to the nuts. Observe tightening
torques.
4. Insert the short bolts (A20) with washers
(A25) through the intended holes on the
diaphragm cases (A1, A2).
5. Screw the short nuts (A21) onto the bolts
(A20) and tighten them. Observe tight -
ening torques.
5.2.2 Increasing the actuator
thrust
The thrust can only be increased in actuators
with "stem extends" direction of action. To
achieve this, the springs of the actuators can
be preloaded by up to 50 % of their travel or
bench range. The operating travel is reduced
by this percent correspondingly.
Note
NOTICE !