$4\mathrm{.}5.$ A $16-$in$.$ cone valve has an operator with a torque limit of $200ft-lb.$

Find the maximum allowable velocity at $83$ open $($peak value$).($Use

data for $12$ in$.$ cone valve, Figs. $4\mathrm{.}3$ and $4\mathrm{.}5.)$

Answer is $18\mathrm{.}4fps$

Fig. $4\mathrm{.}3$ Discharge coefficients for in$-$line valves.

Fig. $4\mathrm{.}5$ Torque coefficients for a cone valve.