Anyone know much about sizing hydraulic adjustable flow controls? I see flow controls capable of between 8 and 30 GPM. My system is 3-4gpm. Does it matter if I use a flow control rated at 16gpm, or should I choose one closer to my system's flow rate? I ask because I am unsure if the flow control's adjustable flow is proportional to it's orifice diameter or simply the incoming flow to the valve. My thinking is that is I use a large flow control, I will have less of an adjustable range, but I'm not sure! Thoughts?