Description

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:
  $$ℎf = k_Q\cdot Q^2$$