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

Ball valve

Description

Find the head loss coefficients for partially open ball valves.

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

Ball valve

References

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