A well proved principle of worm gearing is
used to reduce the motor speed to required
output speed of actuator. Self-locking feature
is achieved by worm gearing upto 90 output
rpm. Worm shaft and output shaft with worm
wheel run in ample sized bearings. The sliding
worm is positioned between two sets of
springs on worm shaft. The worm moves
axially in relation to thrust which is the
measure for torque. Via lever & gears the
Depending upon type of valve, the actuator
must be switched off at end positions by limit
switch or torque switch. For this purpose,
independent limit switching or torque
switching devices are provided in the switch
compartment. The switching devices are easily
Motor Terminal Compartment
Change Gears Valve Attachment
Reduction Gearing Manual Operation
Switch Compartment
Design Principle
Especially high starting torque is frequently
required to unseat valves from end positions.
The motors developed by Auma fulfil this
basic requirement.
accessible for any setting at site.
All electrical connections are terminated inside
the terminal compartment. Screw type terminals
are provided for easy connections. Multi-pin
plug-socket connector can be provided for ease
of connections & maintenance.
site.
Auma actuators are driven by special
combination of gears which are outside the
grease filled housing & require no lubrication.
If required, output speed can be easily altered
by changing the gear pair and / or motor at
for adaption to various types of valves.
The mounting flange is according to ISO 5210 /
DIN 3210. Various output drives are available for
torque is transmitted to control unit.
disengaged.
For commissioning or in an emergency, actuator
can be operated with hand wheel. When starting
the motor, the manual drive is automatically
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