Concerned over Backpressure by Adding a CSV Valve to Existing System

[vpr80]

First of all, thank you very much for the very quick replies...certainly helps.

Just out of paranoia, I think that I will get the CSV1W instead. The house is old and that supply line is like 50 yrs old so I rather not take chances with it. It might be fine at 60 psi, but I don't want to find out if the pipe and all the fittings can handle sustained 130 psi for hours at a time while the sprinklers are running.

Thanks again!