Determination of shaft torsion in case of butterfly valves

[ibrahimdemir]

Hi there,

In case of large size ( 1 metre of diameter and above ) of butterfly valves, how do you determine the torsion on the shaft?

Do you have a chart, formula or test results to determine moment on the shaft under different attack angle of the valve disk?

I am looking for this information for the butterfly valves with single disk and biplane disks. Any suggestion and help welcome.

Thanks in advance.

Ibrahim Demir
Design Engineer
Clyde Babcock Hitachi
idemir@cbh.net.au