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Head loss coefficient applicable to partially open ball valve
Default

Input data

Diameter

Opening angle (°)

Output data

k of type A

kQ of type A

k of type B

kQ of type B

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=k⋅U22g hf = \frac{k \cdot U^2}{2g}
  • For kQk_Q applicable to:
    hf=kQ⋅Q2 ℎf = k_Q\cdot Q^2

Ball valve

References

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