Valve Benchsets

Hi there,

This has been answered in many threads before.

If you have studied you will know how to select the characteristic of the valve - you need to know your process characteristic as this determines your valve characteristic. Is the process linear; =% etc etc? This is not an easy thing to explain - use google and you will find your answers.

Playing with your valve stroke zero and span limits as well as your positioner zero and span limits will change the valve bench set - I am not sure if you know what bench setting a valve means?

When we ask for the valve to be bench set - we are asking for the valve stroke as well as the positioner to be pre calibrated to a certain range i.e. 100% stroke equates to a 4 - 20 mA signal from DCS to a 20 - 100kPa signal from I/P to positioner - to x - y on the actuator.

Please refer to the manufacturer documentation and you will get your answers.

Somehow this sounds like a question from some homework paper?

Regards,

Craig

I too thought so, then I checked up OPs previous posts (thogh only 2 ) and they didn't look like homework (especially the post #2 which was off topic)

May be a green horn in a power plant.