The figure below shows a test rig for evaluating the loss coefficient, K, for a valve. Mechanical energy losses in valves are modeled by the equation: .1 where gh, is the mechanical energy loss and V is the flow velocity entering the valve. In a particular test, the pressure gage reads 26 kPa, gage, and the 1.5-m catch tank fills in 2 min 55 s. D = 6 cm D = 4 cm Pressure gauge Valve 20 ghL = K K (1/2/) Catch tank Calculate the loss coefficient for a water temperature of 20 C.