What no one seems to be able to tell me is how much back pressure will be created in the piping from the dole valve back to the pump. A method on how to calculate it would be best actually. I don't mind putting one on there if there is no risk of excessively high pressure in those lines. It really is very similar to going with a CSV.
The last thing I need is to create enough back pressure to rupture a line underground or in the well.