Input data

Diameter

t/D

Output data

k for typical valve

kQ for typical valve

k for best project

kQ for best project

Description

Finds the head loss coefficients for fully open butterfly valves.

Given the diameter and the relation maximum thickness/diameter of a fully open butterfly valve, calculates the k values corresponding to two different types of valves, 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: $ℎf = k_Q\cdot Q^2$

Butterfly valve

Description

Finds the head loss coefficients for fully open butterfly valves.

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

Butterfly valve

References

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