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All ST models except ST6
Except ST6, all actuators of ST range are provided with an automatic
declutched handwheel, with motor drive priority. Operating direction is
normally indicated on the handwheel.
5 ACTUATOR ON VALVE ASSEMBLY
Actuator should be secured directly to the valve (or the gearbox) using
proper bolts or via a proper interface. After assembly, the actuator can
operate in any position. However, cable glands should not be oriented
upwards (loss of water tightness) and the motor will preferably not be
positioned at the bottom (potential internal condensation trap).
Do not handle the actuator by handwheel, it could
See details on storage precaution prior to starting-up.
Greasing of A form drive bush has to be done prior to
6 MECHANICAL STOPS SETTING (1/4 TURN
ONLY)
Mechanical stops description and function
These items avoid any over-travelling during
operations. The stops can be positioned either on the
actuator itself or on the 1/4 turn worm gearbox if
any.
Actuators and gears are supplied and tested for a 90°
operation. Fine adjustment of the stop screws
position is possible within a limit of ± 2° maximum.
On quarter-turn actuators, mechanical end stops, located either
on the actuator or the gearbox, mechanically limit the actuator
travel during manual operation.
It is mandatory that the motor stops, in both directions, on the
travel limit switch and not on the mechanical end stop (check
available extra travel to the stop with the handwheel).
damage the gears.
mounting actuator on valve (in the case of a rising stem
valve).
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