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tors without fail-safe action) engages in
the actuating shaft.
2. Turn the quarter-turn fastener to the
locked position.
5.4 Mounting the actuator
The actuator is mounted either directly onto
the valve or using a yoke depending on the
valve version used (see Fig. 5-3).
5.4.1
Actuator without fail-
safe action
5.4.1.1
Force-locking attach-
ment
1. Turn the handwheel (2) counterclockwise
to retract the actuator stem.
2. Place the actuator on the valve connec-
tion and fasten with the coupling nut (4).
Tightening torque
5.4.1.2
Form-fit attachment
1. Place the actuator on the yoke and fasten
with the coupling nut (4).
Tightening torque
Place actuator with yoke (11) on the
valve and fasten with the nut (13).
Tightening torque
2. Pull plug stem until it reaches the actua-
tor stem or extend actuator stem using
the handwheel (2).
3. Position the clamps of the stem connector
(12) included in the accessories on the
EB 5827-2 EN
ends of the actuator stem and plug stem
and screw tight.
5.4.2
5.4.2.1
"Actuator stem extends" fail-safe action
The actuator stem must be retracted before
the actuator can be mounted onto the valve.
The stem can be retracted either mechanical-
ly or electrically. Both methods are described
below.
Retracting the actuator stem mechanically
1. Unfasten the front housing cover and
place a 4 mm Allen key on the red
actuating shaft.
2. Retract the actuator stem: turn Allen key
counterclockwise and only as far as the
20 Nm
top end position which is at the point
where the torque switch is activated (see
the 'Operation' section).
NOTICE
!
Risk of damage to the actuator by moving
20 Nm
the actuator stem too far.
Î Move the actuator stem only as far as the
top end position.
150 Nm
3. Hold Allen key in place and fasten valve
and actuator together using the coupling
nut.
Tightening torque
Actuator with fail-safe
action
Force-locking attach-
ment
Installation
20 Nm
5-3
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