Actuators Type A0 pages

Datasheett
Pneumatic actuatorst
Type A - DAt
Type A - SCt
Type A - SOt

•t Compact design
•t Patented torque
backlash-free
transmission

•t
•t Optimized torque
curve
•t Standardisedbetween
connections
Low friction seals

valve and
accessories

Si-503 EN
Edition: 2015-02

Double acting actuator
Single acting actuator (spring to close)
Single acting actuator (spring to open)

SOMAS actuators are designed for optimal function in control and on/off applications.
The type A pneumatic actuators are specifically made to fit the SOMAS range of valves.
They can also be used with most 90° rotary valves. The A-DA actuator is double acting
and the A-SC and A-SO actuators are single acting spring return for fail safe operation.
SOMAS offer a patented backlash-free transmission friction coupling (valid for D≤50) to
optimize control performance and eliminate backlash. The actuators are designed to fit
valves and accessories with the ISO 5211 and VDI/VDE 3845.
SOMAS actuators have a torque curve corresponding to the torque demand for ball
segment, butterfly, and ball valves. Low-friction seals allow for a low starting torque.
Single or dual- cylinder units are used depending on the required torque and air supply
pressure.
Single acting actuators are optimised according to compact dimensions. The springs are
supplied in a cartridge to reduce the risk of injury and to simplify maintenance.
Adjustable travel stops are provided for both open and closed positions.