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Find the head loss coefficients for partially angle valves.

Given the diameter and the opening relation of an angle valve, calculates the head loss coefficients, for the expressions:

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

Find the head loss coefficients for partially angle valves.

Given the diameter and the opening relation of an angle valve, calculates the head loss coefficients, for the expressions:

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

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