Determinação dos coeficientes de perda de carga aplicáveis a a válvulas de gaveta e guilhotina parcialmente abertas
Default

Input data

Diameter (D) or height (H)

Opening ratio

Output data

k for knife gate valve

kQ for knife gate valve

k for gate valve

kQ for gate valve

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=kU22g hf = \frac{k \cdot U^2}{2\cdot g}
  • For kQk_Q applicable to:
    hf=kQQ2 ℎf = k_Q\cdot Q^2

Gate valve

References

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