ARA single acting actuators with spring, are suitable for the operation of valves for ON-OFF and modulating heavy-duty service. The ARA valve actuator is made by three main parts:

• The external cylinder group, with a piston inside that divides the internal volume in two chambers. A
  stem connects the piston to the valve stem.
• The internal cylinder group that permits to transform through cams the valve movement into rototranslatory.
• The yoke, that fix the cylinder to the valve.

Different kind of pneumatic accessories can be mounted on the ARA valve actuator depending on the
performance required.