A coolant (specific gravity = 1.2) is pumped through a heat exchanger and control valve at a nominal (desired) flow rate of qd = 0.6 m3/min. The total pressure drop over this heat exchanger system (including piping and fittings) is constant at 450 kPa. The pressure drop over the system without the control valve, Ps, is proportional to the flow rate squared. Its nominal value at the desired flow rate is Psd = 200 kPa. The control valve is to be designed so that the nominal flow rate is 2/3 of the maximum flow rate when the valve is completely open. Based on this information, what value of the valve coefficient Cv should be specified?