EB 8312-2 EN
27
Decommissioning and disassembly
9 Decommissioning and disas-
sembly
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.
−
Do not insert hands or fingers into the yoke
while the valve is in operation.
−
While working on the handwheel, discon-
nect and lock the pneumatic air supply as
well as the control signal.
−
Use the locking bolt to lock the handwheel.
Risk of damage to control valve components
due to excessively high or low tightening
torques.
Observe the specified torques on tightening
control valve components. Excessively tight-
ened torques lead to parts wearing out
quicker. Parts that are not tightened far
enough may loosen.
Observe the specified tightening torques
(
u
AB 0100).
See associated valve and actuator documen-
tation for additional instructions on removal
and decommissioning.
9.1 Decommissioning
To decommission the handwheel for mainte-
nance and repair work on the valve or for
disassembly, proceed as follows:
1. Put the control valve out of operation.
See associated valve documentation.
2. Disconnect the pneumatic air supply to
depressurize the actuator.
3. Make sure the handwheel is locked.
9.2 Removing the handwheel
from the actuator and
valve
1. Put the control valve out of operation.
See associated valve documentation.
2. Unscrew the hex screws (A29) at the
stem connector clamps (A26/27) be-
tween the handwheel and actuator.
3.
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).
In the "actuator stem retracts" version:
vent the actuator to retract the actuator
stem (A7) completely.
4. Unscrew the stem connector nut (G70)
and lock nut (G42) between the hand-
wheel and actuator.
5. Unscrew the ring nut (A8).
6. Disconnect the signal pressure again.
7. Remove the ring nut (A8) and actuator
from the handwheel. Loosely thread the
ring nut onto the actuator stem (A7).
WARNING
!
NOTICE
!
Note
