Samson 3374 - Construction with Ring Nut

11-2 EB 8331-3 EN
Removal
Î The actuator stem moves to the fail-safe
position.
7. Disconnect the wires of the connecting
lines.
8. Remove the connecting lines.
Actuator with "stem retracts" fail-safe
action
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.
6. Loosen the nut at the yoke.
7. Lift the actuator off the valve.
11.2 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 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
action
1. Make sure that a signal from the control-
ler cannot act upon the actuator. If neces-
sary, disconnect the wires connecting the
controller.
2. Retract actuator stem as described in the
'Operation' section.
3. Undo the stem connector parts between
the plug and actuator stems.
4. Unscrew the ring nut on the valve bon-
net.
5. Lift the actuator off the valve.
6. Disconnect the supply voltage and pro-
tect it against unintentional reconnection.
Î The actuator stem moves to the fail-safe
position.
7. Disconnect the wires of the connecting
lines.
8. Remove the connecting lines.
Actuator with "stem retracts" fail-safe
action
1. Disconnect the supply voltage and pro-
tect it against unintentional reconnection.