High-performance butterfly valves tend to have an inherent flow characteristic ... in pump head from 100 gpm to 600 gpm stated in the figure. The curve for P 2, the pressure at the control valve ...

A butterfly valve has a hollow stem ... Controls and Masoneilan Co., was founder of the Baumann Valve Co. He is credited with more than 100 U.S. patents and wrote eight books (among them the Control ...