2. A pipeline discharges liquid from an elevated open top tank to an open reservoir. The hydrostatic head provides the driving force for flow through the system. The change in liquid level in the elevated tank is negligible relative to the 30 ft elevation difference. Therefore, the hydrostatic head is assumed constant. A control valve is to be designed for the discharge line so that the maximum flow rate from the tank will be 400 gpm. The pipeline pressure drop at the maximum flow rate is 4 psi, and it is proportional to the flow rate squared. Assume the liquid is water with a specific gravity equal to one. (a) Determine the valve coefficient Cy. (b) Consider a control valve with linear trim and an equal percentage control valve with R = 30. Compare the two control valves by plotting the installed valve characteristics (q vs. ). Which valve would you recommend and why? qi 30 ft q F