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Finds the head loss coefficients for fully open butterfly valves.

Given the diameter and the relation maximum thickness/diameter of a fully open butterfly valve, calculates the k values corresponding to two different types of valves, for the expressions hf = k.U²/2g and ℎf = kQ.Q².

- For k applicable to:
$hf = \frac{k \cdot U^2}{2\cdot g}$
- For $k_Q$ applicable to:
$ℎf = k_Q\cdot Q^2$

Finds the head loss coefficients for fully open butterfly valves.

Given the diameter and the relation maximum thickness/diameter of a fully open butterfly valve, calculates the k values corresponding to two different types of valves, for the expressions hf = k.U²/2g and ℎf = kQ.Q².

- For k applicable to:
$hf = \frac{k \cdot U^2}{2\cdot g}$
- For $k_Q$ applicable to:
$ℎf = k_Q\cdot Q^2$

- Miller, Donald S. Internal flow systems. BHRA Fluid Engineers, 1978.