Input data

Diameter

Opening angle (°)

Output data

k of type A

kQ of type A

k of type B

kQ of type B

k of type C

kQ of type C

Description

Find the head loss coefficients for partially open butterfly valves.

Given the diameter and the opening angle of a butterfly valve, calculates the head loss coefficients corresponding to three different types of valves, for the expressions:

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

Types of opening valves

Description

Find the head loss coefficients for partially open butterfly valves.

Given the diameter and the opening angle of a butterfly valve, calculates the head loss coefficients corresponding to three different types of valves, for the expressions:

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

Types of opening valves

References

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