Originally Posted by hypergolic
Do you manually control the flow from the MLT to the BK then?
Yes and no.
MLT -> manual ball valve -> solenoid valve -> BK
The controller opens the solenoid valve. If necessary, I could adjust the flow using the manual ball valve. However, I've never found it necessary. I target a 45 minute sparge. I tend to get that with the manual ball valve wide open. Your mileage may vary.
In theory, with a continuous level indicator in the BK, you can calculate the sparge rate (say, once a minute?) and open/close the solenoid valve (or motorized ball valve) to control the flow rate. Or maybe you're pumping wort between the MLT and BK. You'd turn the pump on/off.