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Find the head loss coefficients for partially open gate and knife gate valves.

Given the diameter and the opening relation of a gate valve, or the side and the opening relation of a knife gate valve, calculates the head loss coefficients, 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:
$ℎf = k_Q\cdot Q^2$

Find the head loss coefficients for partially open gate and knife gate valves.

Given the diameter and the opening relation of a gate valve, or the side and the opening relation of a knife gate valve, calculates the head loss coefficients, 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.