I've modeled a distribution system using two perched reservoirs on opposite sides of the City to simulate their constant head pump stations. I'd like to limit the total flow out of one of the reservoirs (to simulate to capacity of the pump station) but when I use a FCV there is significant headloss across it that lowers the pressure coming out of that reservoir, even with large diameter pipes/valves. If I raise to head of the reservoir there is just more headloss across the FCV. Is there any way to control the flow out of a reservoir without a FCV? Is there any way to force a FCV to have zero headloss?