Description

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:
  $$ℎf = k_Q\cdot Q^2$$