ARI Armaturen ARI-PREMIO - Manual (Page 5)

0040501000 4511 Page 5
Operating and installation instructions
Thrust actuator ARI-PREMIO
4.0 Description
4.1 Field of application
ARI-PREMIO linear thrust actuators are employed to actuate control or shut-off valves
requiring a nominal linear stroke distance of up to 80 mm and thrust from 2.2 kN to 15 kN.
The thrust actuators are set to the thrust forces specified in the technical data. If supplied
with the valve, the lift of the thrust actuator will be set to the stroke distance of the valve.
Selection of the proper actuator version in alignment with the corresponding fitting as well
as use of the thrust actuator in accordance with the specified technical data is the
responsibility of the systems engineer.
See data sheet for areas of application, application limits and potential.
Any use of the thrust actuator beyond the specified technical data or improper use of the
actuator is deemed to be not for the intended purpose.
The ambient conditions have to be conform to the actual electromagnetic compatibility
directives. Additional the compatibility to this directives has to be maintained in case of
expansion or other changing of the ambient conditions.
4.2 Method of functioning
The thrust actuator, fitted with a yoke or columns, is mounted to the valve.
Transfer of force is effected via a coupling safeguarded against torsion.
The torsion safeguarding feature also serves as a lift indicator.
The lift settings can be read off on a lift dial attached to the yoke or between the 2-ear
clamps mounted to the column.
The electrical components are accommodated separately from the gearbox underneath a
sealed hood, thus being protected against operating and environmental effects.
Following removal of the hood, easy access is provided to the switchgear and indicating
feature.
The rotary motion of the motor is transmitted to the spindle nut by means of spur gear.
The drive spindle, which is safeguarded against torsion, screws its way into the spindle nut
and thus performs a pull or push motion depending on the sense of rotation.
In the final positions of the valve, the spindle nut is pressed against a set of springs so as to
produce closing force.
The motor is switched-off by means of two load-dependent switches and one stroke-
dependent switch. For the function of the stroke-dependent travel switch (S3), an optionally
available trip slide is necessary. The load-dependent switches will also switch-off the motor
if foreign bodies have lodged themselves between the valve seat and cone.
The load-dependent switches serve to protect the valve and thrust actuator against
damage.