Answer
The selection depends on the actuator type of your valve.
- Single-acting positioner: Used for single-acting pneumatic actuators, usually with spring return.
- Double-acting positioner: Used for double-acting pneumatic actuators, where air is supplied to both sides of the actuator.
In simple terms, choose the positioner type according to whether your valve actuator is single-acting or double-acting.
If you are not sure, please share the actuator nameplate or valve photos with our sales team for selection support.