Removing The Actuator From The Valve; Relieving The Spring Compression In The Actuator - Samson 3371 Mounting And Operating Instructions

Removal
11.1 Removing the actuator
from the valve
a) 120 cm² actuator area
For mounting using crossbeam (form B)
NOTICE
!
Incorrect removal will damage the actuator.
Î Do not loosen the rod nuts (A72) that
hold the crossbeam (A17) on the rods
(A11).
1. Remove the clamps of the stem connector
(A30) from the actuator.
Removing actuators with "stem ex-
tends" action with/without preloaded
springs: to undo the central nut (98), ap-
ply approx. 50 % signal pressure to open
the valve.
2. Unscrew the central nut (98) from the
plug stem.
3. Disconnect the signal pressure again.
4. In the "actuator stem retracts" version:
detach the external piping.
5. Lift the central nut (98) and actuator off
the valve.
6. Screw tight the central nut (98) on the
valve.
7. Screw tight the stem connector clamps
(A30) onto the actuator.
For mounting using rods (form C)
1. Remove the stem connector clamps (A31)
from the actuator.
11-2
2. Undo the rod nuts (A72) in alternating
sequence.
3. Pull the rods (A11) with bushings (A12)
out of the holes in the valve bonnet (2).
4. Remove the bushings (A12) from the ac-
tuator and thread the rod nuts (A72) on-
to the rods (A11).
5. Screw tight the stem connector clamps
(A31) onto the actuator.
b) 350 cm² actuator area
1. In the "actuator stem retracts" version:
detach the external piping.
2. Remove the clamps of the stem connector
(A12) from the actuator.
3. Undo the rod nuts (A54) in alternating
sequence.
4. Pull the rods (A33, A51) out of the holes
in the valve bonnet (2).
5. Thread the rod nuts (A54) onto the rods
(A33, A51) on the actuator.
6. Screw tight the stem connector clamps
(A12) onto the actuator.
11.2 Relieving the spring com-
pression in the actuator
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.
EB 8317 EN