Valve positioners compare a control signal to a valve actuator's position and move the actuator accordingly. They are used with both linear valves and rotary valves. Valve positioners are used when ...

Valve position indicators are electrical switching devices that mount directly on a valve actuator, or indirectly on a transfer case. They are used in conjunction with a valve positioner. Valve ...

The article will then look at valve types very briefly before focusing on digital positioners. It will examine the expectations that the user should have with regards to digital positioners, for ...