AUMA part-turn actuators serve to operate part-turn valves. The motor revolutions are reduced and transformed
into a swivel movement via a planetary and worm gearing. AUMA part-turn actuators SG can close and open the valve either in
limit or torque seating. For this purpose two independent measuring systems are integrated into the control
unit. Limit and torque seating require different logic connections of the actuator signals, which must be
realized in the controls. 

When using the actuator controls AUMA MATIC the desired seating method can be set by a switch.
Limit seating in opening and closing direction The limit switches are adjusted so that the actuator switches off at the
desired end positions.

Torque seating in closing direction Certain valve types are torqueseated. In this case the torque switching
is set to the desired tripping torque. The limit switching is set so that the switch trips just short of the end
position. By utilizing both signals in the controls the signal ‘end position reached’ can be transmitted to the
control room. Torque switching as overload protection The torque switching acts as overload
protection for the driven valve in both directions over the whole travel. The actuator is switched-off if the torque
switching is tripped before reaching an end position, i.e. due to tightness of the valve or a trapped
object. In this case the signalisation of the limit switching is missing, therefore a fault signal is indicated at the
control room.

Part-turn valves find applications in
many industries worldwide to control
the flow in pipelines. Electric
part-turn actuators are gaining more
and more importance in the field of
automation. AUMA has further developed
the reliable part-turn actuators
of the SG range to meet the increasing
requirements for valve automation.
AUMA is a leading manufacturer of
electric actuators. More than 30
years’ experience in conjunction with
the innovative spirit of our engineers
are the sound basis for constant
improvements and further developments.
AUMA offers a wide range of actuators
which fulfills all usual requirements
of valve automation.
Multi-turn actuators from 10Nmup to
32 000 Nm, part-turn actuators from
25 Nm up to 250 000 Nm or linear
thrust units from 3,8 kN up to 217 kN.
All kinds of valves can be operated
by rotation, swivel and linear movements.