Answer / oliver

in postioner there are span and zero setting. with the help of span n zero we can adjust it.
if your valve is not fully close than use zero setting, and if it is not fully open than use span setting.

Answer / subhendu paul

Ur questions is not clear. For open the valve is clear BT how or which pressure required or used to closed. Plzz sir. Clear the my confusion

Answer / ajay

First the question is not correct. for air to open if given 100% air, then valve should be fully open, not close ...clear your question

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Positioner usage.

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