Doc : Q066 Rev : 10
Issued : 01/11/13 Page : 6 of 25
7.3 Thoroughly clean all mounting flanges, taking special care to ensure that all
grease is removed.
7.4 To assist with assembly, lubricate the valve stem with suitable oil or grease.
7.5 Lift the actuator by its lifting eyes and, if possible, ensure that the valve stem is in
the vertical position. NOTE: Do not lift the actuator using slings around the
actuator’s hydraulic or spring cylinders; doing so may result in damage.
7.6 If valve mounting is via a stem adapter and coupling joint (supplied loose),
assemble the coupling joint to the valve stem before proceeding further.
7.7 Lower the actuator onto the valve so that the valve stem slips in the actuator’s
yoke. Fasten the actuator to the valve by means of stud bolts, which are
screwed into the valve’s coupling flange.
7.8 Tighten the nuts to the stud bolts in accordance with the following torques:
Thread Size Torque
M8 20 Nm
M10 40 Nm
M12 70 Nm
M14 110 Nm
M16 160 Nm
M20 320 Nm
M22 420 Nm
M24 550 Nm
M27 800 Nm
M30 1100 Nm
M33 1400 Nm
M36 1700 Nm
7.9 Stroke the actuator to ensure smooth and full opening and closing of the valve.
8. Adjusting Open and Closed Valve Positions
The precise valve open and closed positions are set using the end stop screws. NOTE:
Certain valves incorporate their own end stops. For these types of valves, it is
recommended that the valve's end stops be adjusted to their maximum travel so that the
valve’s end positions are achieved using the actuator’s end stop screws only.
To adjust the open and closed valve positions:
8.1 Loosen the protective nut on each of the end stop screws.
8.2 Move the actuator yoke away from the applicable end stop screw.
8.3 Screw the applicable end stop screw to reduce the actuator’s angular stroke,
unscrew to increase it.
8.4 Move the actuator yoke towards the applicable end stop screw.
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