I am looking to upgrade from 2.5x40 to a 4x40 system (homemade). I currently use a needle valve to re-circ to before the HP pump inlet.

I would like to put a high case (working) pressure pump for recirculation in my system next year. I have looked around but I have not found a great option yet.

Working pressure 250 or 300 psi.
It looks like Goulds has a few options: HM Sleeve pump, 1SV, or 5GB
Do the Procon pumps work? I only see the outlet pressure and not the case pressure.

If you have 4x40 system, what high pressure re-circ pump are you using or is in your system? MES, CLD, homemade, etc.

Thanks