ELECTRIC ACTUATORS - YOO SHIN E&I CO., LTD.

12
USER’S
GUIDE
CHOOSING
THE RANGE
Mechanical and
electrical features
QUARTER-TURN
Often installed in enclosed
spaces, the quarter-turn electrical
actuator must be as
compact as possible. The irreversibility
of the actuator is
necessary in order not to supply
power on a permanent
basis even when the device is shutdown and to
guarantee that the valve stays in the required position.
Moreover, for operation in environments generating
strong vibrations, it is essential that the gear
modules be well sized for a better resistance.
Lastly, even if the travel limitation provides for the
stop of the actuator, it shall also be equipped with
mechanical stops in order to protect the driven
device in the case of a manual operation with the
handwheel.
Our choice : – compact
– self-locking with a worm/
quadrant gear
– large gear modules
– adjustable mechanical stops
MULTITURN
The multiturn electric actuators
can either be mounted
directly or with additional
reduction gears. In order to
meet the requirements of
their numerous functions, a
wide range of torque and speed values are required.
They must also offer full irreversibility, whatever
the operating speed, in order to maintain the
valve in position. For the user’s safety, it is highly
recommended that the handwheel does not rotate;
priority must also be given to the electric control,
without clutch system for high torque actuators.
Geardrives
Our choice : – wide range of speed and
torque values
– easy-to-use
– self-locking at all speed
– non-rotating handwheel with
priority to electric control
For high torque values, our SERMATIC system
combined with a differential gear on the output
shaft enables driving either by a motor or a
handwheel without any clutch system, providing for
considerable enhancement and simplification of the
geardrive.
MODULATING
As regards modulation, the
most important criteria are
precision and long-term availability.
The use of small motors
considerably reduces the
inertia.
Furthermore, a high reduction gear directly installed
at the motor output provides for a better control
of the actuator.
Lastly, to reduce the play in the handwheel mechanism
to a minimum, the use of a system with
manual priority is better adapted.
Our choice : – precision with small motors
– quality / price ratio
– long term availability
thanks to our epicycloidal
gear system
LINEAR
The L. BERNARD range of linear actuators is
obtained by adding a movement conversion system
to the multiturn actuator.