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Control valve authority

asked Aug 1, 2014 in Process by cobiesmith (3,310 points)
What is valve authority? How to calculate it?

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answered Aug 5, 2014 by ChemKB (8,210 points)
It is the ratio of the differential pressure when the valve is fully open to valve is in almost closed positions.

Valve authority = Open valve resistance / pipe loop resistance

The valve turndown ratio is calculated by multiplying the inherent rangeability factor times the square root of the valve authority.

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