Description

Find the head loss coefficients for partially open butterfly valves.

Given the diameter and the opening angle of a butterfly valve, calculates the head loss coefficients corresponding to three different types of valves, for the expressions:

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