I would like to  know  what is the max.  recommended flow velocity for a  132" butterfly valve used as a  water regulating valve in a  dam.  The  water  head is 125 feet.
I have looked on the AWWA standards but they only cover valves up to 72".
For water flow, recommended velocity at trim exit of control valve is 100 feet/sec., i.e. an exit trim fluid kinetic energy of 70 psi.

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