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1 2006

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Investigations of butterfly control valve flow characteristics

Wojtkowiak J., Oleśkowicz-Popiel C.

Foundations of Civil and Environmental Engineering

2006

No. 7

381-395

Butterfly valves are the most popular control devices in ventilation and air conditioning systems. The results of experimental and numerical (CFD) investigations of a commonly used valve having a thin-flat-sharp-edge disk and blockage ratio d/D = 0.947 have been presented. Flow characteristics, flow patterns and pressure distributions in the disk vicinity have becnshown and discussed. Steady-state, three-dimensional, laminar and turbulent flows (10(3) < Re < 2x10(4) have been analyzed. It is shown that the literature data differ considerably from our new experimental and numerical results. Based on the new results an improved flow characteristics equation K=f(d/D, a, Re) valid for dID = 0.947 has been proposed.