12-2 EB 8331-4 EN
Removal
6. Loosen the nut at the yoke.
7. Lift the actuator off the valve.
12.2 Construction with ring nut
Actuator without fail-safe action
1. Disconnect the supply voltage and pro-
tect it against unintentional reconnection.
2. Make sure that a signal from the control-
ler cannot act upon the actuator. If neces-
sary, disconnect the wires connecting the
controller.
3. Disconnect the wires of the connecting
lines at the actuator.
4. Remove the connecting lines.
5. Retract the actuator stem as described in
the 'Operation' section.
6. Undo the stem connector parts between
the plug and actuator stems.
7. Unscrew the ring nut on the valve bon-
net.
8. Lift the actuator off the valve.
Actuator with "stem extends" fail-safe ac-
tion
1. Retract the actuator stem as described in
the 'Operation' section.
2. Undo the stem connector parts between
the plug and actuator stems.
3. Unscrew the ring nut on the valve bon-
net.
4. Make sure that a signal from the control-
ler cannot act upon the actuator. If neces-
sary, disconnect the wires connecting the
controller.
Î The actuator stem moves to the fail-safe
position.
5. Disconnect the supply voltage and pro-
tect it against unintentional reconnection.
6. Disconnect the wires of the connecting
lines.
7. Remove the connecting lines.
8. Lift the actuator off the valve.
Actuator with "stem retracts" fail-safe ac-
tion
1. Disconnect the supply voltage and pro-
tect it against unintentional reconnection.
Î The actuator stem moves to the fail-safe
position.
2. Make sure that a signal from the control-
ler cannot act upon the actuator. If neces-
sary, disconnect the wires connecting the
controller.
3. Disconnect the wires of the connecting
lines at the actuator.
4. Remove the connecting lines.
5. Undo the stem connector parts between
the plug and actuator stems.
7. Unscrew the ring nut on the valve bon-
net.
8. Lift the actuator off the valve.
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