Replace ball valve and anti siphon valve copper

[gerry]

Hi I need to replace the anti siphon brass valve and the ball valve. Any suggestions on best way to do this? I'm not sure which joints I should unsweat and steps to put it back together.

 

[breplum]

1. Check pressure to see if you need pressure reducing valve.
2. you sure you need to replace the LHBV ?
if not, I'd suggest hacking off just the anti-siphon valve, adding a dedicated LHBV as required to serve the sprinkler then you are done.
A good plumber with a pro-press can rebuild the whole thing in 20 minutes.