This is the valve we just installed for our 5hp pump. Very curious to see how it performs for domestic and irrigation purposes.
Nice setup, but why the 5 HP pump? How many feet/miles of irrigation pipe are you going to run?
Just a note, I too use the PVC ball valves which need replacement from time to time. If you have any sand, no matter how fine, that plastic ball will eventually show grooves. Brass/S/S valves are way better. I know, they're expensive as hell but in the long run they save on labor and time.
I love Grundfos submersible pumps. Like I said my 1 HP kicks butt and is really overkill. For the house and other structures (greenhouse, store, etc.) I have the Grundfos Constant Water system. With the touch of a button you can change the PSI from 40 to 110 on the console, turn it off, has internal diagnostics, dry well control, etc. It's a DC pump connected to 110V AC such that the voltage supply is used to talk back and forth to the control console and computer in the pump housing. A pressure transducer in line measures the pressure and tells a computer in the pump how much RPM's to turn. So, if you're brushing your teeth (low demand) the pump spins slowly. If the transducer senses that 4 two inch lines are open and you need full output it spins at 12,000 RPM. Mine has been active going on 13 years.
Also, jerry rigging a 4' long PVC tube skirt by clamping it to the bottom of the pump will insure very little debris intake as the pump kicks in, hits the side of the well with its torque, etc.