As addressed in my July 18th and July 25th blogs, to achieve best control performance, it is important that the final control element moves to a position that matches that requested by the control system. The minimum size of change in the PID output that the control element can respond to can be quickly confirmed …
Tag Archive: positioner
Jul
25
Commissioning Control Systems – Valve Performance
As addressed in my July 18th blog, when a valve positioner is installed on a valve actuator, as long as it is functioning properly it will automatically increase the actuator pressure until the valve moves to a position that matches that requested by the control system. Feedback of the stem position is used by the …
Jul
18
Commissioning Control Systems – Valve Positioners
When commissioning a control system, it is important to be aware of whether a regulating valve is equipped with a positioner. If a valve does not have a positioner, then as part of loop commissioning it may be necessary to install a positioner on the valve to achieve the desired control performance. For various reasons, …
