while stroke checking of a linear control valve ,found its travel is in non line

while stroke checking of a linear control valve ,found its travel is in non linear ,what can be possible reason ? ( please answer send in mannanali65@gmail.com) pls pls pls if any body know

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while stroke checking of a linear control valve ,found its travel is in non linear ,what can be poss..

Answer / md altaf

If your ccontrol value was nonlinear 1st you check the strock was set same(set back side of your positioner) as your control(wrriten on your control valve body).
2 and step was after equalise the stock then you adjust span and zero.
After you set the span and zero the control valve was working in normal condition.

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while stroke checking of a linear control valve ,found its travel is in non linear ,what can be poss..

Answer / carl_ellis

The positioner is configured for quick opening, equal
percentage, or some custom non-linear characterization.

Carl Ellis
Measure First

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