ARI Armaturen ARI-PACO 1,6kN EN - Manual (Page 5)

0040506001 1811 Page 5
Operating and installation instructions
Electric thrust actuator ARI-PACO 1,6 kN
4.0 Description
4.1 Field of application
Actuating or shut-off valves are operated with the ARI-PACO 0.85 linear actuators which
have a linear nominal path of up to 30 mm and require a thrust force of 1,6 kN. The linear
actuators are adjusted to the thrust forces denoted in the technical data. When delivered
with the valve the linear actuator travel has been adjusted to the control path of the valves.
The plant planner is responsible for the professional selection of the drive variant for the
respective armature and the employment of the linear actuators according to the current
technical data. Any use of the linear actuators in ways other than described in the technical
data as well as inappropriate usage is hence not in accordance with the regulations. The
environment must conform to the currently-valid EMV regulations. Annual inspection is
required in order to sustain electromagnetic compatibility. Furthermore, the level of the
electromagnetic load in the environment should be monitored if electrical or electronic
components have been mounted in the surroundings.
4.2 Method of functioning
The linear actuator, fitted with a yoke, is mounted on the valve. The transfer of force is
carried out by means of a coupling protected from torque. The torque protection also
functions as the travel display. The actuating ranges can be read from the travel scale
which is attached to the yoke.
The electrical modules are separated from the transmission and are located in the sealed
housing, protected against operating and environmental conditions. After removing the
housing, the switching and notification assemblies are easily accessible. The twisting
movement of the motors is transferred to cylindrical gears on the stem nut. The drive stem,
secured against torque, screws itself into the stem nut and thus, depending on the
direction, a pulling or pushing movement is created. In the end positions of the valve, the
stem nut is pressed against a spring assembly and generates a closing force. The motor is
switched off by means of a force-dependent or electronic switch. The force-dependent
switch will also switch off the motor if a foreign body has come between the valve seat and
cone. The switch protects the valve and the linear actuator from damage.