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Find the head loss coefficients for partially open ball valves.

Given the diameter and the opening angle of a ball valve and the relationship between the passage area of the valve and the pipe in which it is installed, calculates de head loss coefficients applied to the formulae hf = k.U²/2g and hf = kQ.Q²

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

Find the head loss coefficients for partially open ball valves.

Given the diameter and the opening angle of a ball valve and the relationship between the passage area of the valve and the pipe in which it is installed, calculates de head loss coefficients applied to the formulae hf = k.U²/2g and hf = kQ.Q²

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

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