Steam flows at steady state through a well$-$insulated pressure$-$reducing valve. At the inlet, the pressure is $4$ MPa, the temperature is $320\backslash$deg C$,$ and the velocity is $60$ m$/$s$.$ The pressure of the steam at the exit is $0\mathrm{.}7$ MPa. The inlet and exit have equal diameters, and potential energy effects are negligible. Determine the specific enthalpy, in kJ$/$kg$,$ and the velocity, in m$/$s$,$ at the exit valve.