Removal; Removing The Handwheel From The Actuator And Valve - Samson 3273 Mounting And Operating Instructions

11 Removal

WARNING
!
Crush hazard arising from moving parts.
The handwheel contains moving parts (actu-
ator stem, threaded rod, plug stem, hand-
wheel), which can injure hands or fingers if
inserted into it.
Î Do not insert hands or finger into the
yoke while the valve is in operation.
Î While working on the handwheel, dis-
connect and lock the pneumatic air sup-
ply as well as the control signal.
Î Use the locking bolt to lock the hand-
wheel.
NOTICE
!
Risk of damage to control valve compo-
nents due to excessively high or low tight-
ening torques.
Observe the specified torques when tighten-
ing control valve components. Excessive
tightening 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).
Note
See associated valve and actuator documen-
tation for additional removal instructions.
Before removing the valve, make sure the fol-
lowing conditions are met:
EB 8312-2 EN
− The control valve is put out of operation
(see associated valve documentation).
− The handwheel is locked.
11.1 Removing the handwheel
from the actuator and
valve
WARNING
!
Risk of personal injury due to incorrect
removal of the anti-rotation fixture with
clamps under tension.
Once the actuator has been mounted on the
valve and the assembly is ready for use, the
clamps (301) of the anti-rotation fixture on
the plug stem are under tension.
Î Follow the instructions in this document
during mounting or removal.
Î Do not loosen the screws (303) of the an-
ti-rotation fixture while the force generat-
ed by the supply air and/or the actuator
springs is transmitted to the actuator stem
and the stem connector rod (G5).
Î First remove the actuator from the valve
or ensure it cannot transmit any forces to
the actuator stem before removing the
anti-rotation fixture on the plug stem.
1. Unscrew the hex screws (A29) at the
stem connector clamps (A26/27) be-
tween the handwheel and actuator.
2. In the "actuator stem extends" version:
apply a signal pressure to the connection
on the bottom diaphragm chamber to
completely retract the actuator stem (A7).
Removal
37