Pneumatic actuators

Pneumatic actuator, single acting

The actuator operates by a combination of force created by air and spring force. 

Type: 1/4 turn pneumatic actuator
RA2 – Mechanical locking
RB2 – Adjustable stroke

  • Scotch-yoke design, piston type
  • Local visual position indicator or indicator box with different options
  • Connection flange according to ISO 5211
  • Max working pressure 12 bar
  • Actuator torque range upon request
  • Service temperature -20°C to +70°C
  • Various sizes upon request 
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Pneumatic actuator, double acting

The actuator operates by force created by air. 

Type: 1/4 turn Pneumatic actuator
RA2 – Mechanical locking
RB2 – Adjustable stroke

  • Scotch-yoke design, piston type
  • Local visual position indicator
  • Connection flange according to ISO 5211
  • Max working pressure 12 bar
  • Actuator torque range upon request
  • Service temperature -20°C to +70°C
  • Various sizes upon request 
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Mechanical locking

All RA actuators are delivered with Mechanical Locking as standard. The mechanism is integrated in the actuator and totally independent of hydraulic oil. If there is loss of hydraulic pressure or even a fire, the valve will be kept safe in last position (open/close).

Easy maintenance

The Mechanical Locking gives the feature of Easy Maintenance as well. The only regular maintenance we recommend on Skarpenord actuators, is changing of the piston sealing. Because of the Mechanical Locking, the sealing can be replaced without any dismantling. The actuator can remain attached to the valve and the valve does not have to be disconnected from the pipeline. The maintenance can be performed with the valve safe locked in fully closed or open position. Full flow can be maintained in the pipeline during maintenance.

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