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3 Specification, Technical Data
3.1 Application
Pneumatic control actuators are designed directly for actuating control valves. They are particularly suitable
for utilisation in control systems in the chemical industry. They achieve high actuating powers with short
actuating times. A safety position is also assured in the event of actuating pressure failure by the springs.
3.2 Function & Operation
Pneumatic actuating signals are converted into thrust motion by the pneumatic piston actuator. The required
return force is produced by the pressure springs located on the diaphragm disc.
In the event of air supply failure, the actuator is reset to the default position by spring force.
The actuator mode of operation, i.e. spring opens – air closes (SO) or air opens – spring closes (SC) is
achieved depending on the mounting of the springs. The mode of operation of actuators already fitted to
systems can be changed without additional components using simple tools.
3.3 Section Drawings with Piece Lists
Operation Operation
SO SC SO SC
Fig. 2: Actuator Type PA-N 540 SO & SC without and with Manual Control
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