How is the pressure before and after the control valve determined? Does the control valve allow a limited pressure drop? ?
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1. How is the pressure before and after the control valve determined? 2. What should be the normal pressure drop of the control valve? (Is a limited value for allowable voltage drop required for instrument conditions?) ? Is it true that the greater the allowable pressure drop, the smaller the diameter of the control valve needed, which in turn saves money? So should there be a maximum allowable pressure drop limit? 3. For a digital-control valve, what is the normal pressure drop? What is the limit? Are there any standards I can refer to? ? Thank you!
The control valve has a maximum closing pressure difference, which is related to the design of the diaphragm head and the thickness of the valve stem.
Sir, what does this maximum closing pressure difference mean? ? Is it the valve closing pressure? What should the maximum value be?
Since the conditions related to instruments have been mentioned, then one should consult the instrument specialists; if there are any issues with the conditions proposed, the instrument specialists will provide feedback
Has the original poster resolved the issue? Could they share it?