I'm working as a handyman for a non-profit, and they have an in-ground irrigation system that has been off for a while because "there was a geyser."
I successfully determined that the geyser was water shooting out of the top of the backflow preventer. It had blasted the bell off the top, destroying the guts of the poor thing.
Unfortunately, I'm very unfamiliar with in-ground irrigation systems (I didn't even know what a backflow preventer was until last week). So I'm concerned that if I rebuild the guts of the valve, it may also be destroyed by whatever caused the problem in the first place.
So what kinds of things do I need to check for to make sure that the new backflow preventer isn't similarly disemboweled? Is this just a thing that happens when they get old? Is there something else farther down in the system that is creating a bad situation?
My hope is that the original failed because it froze too hard, and this one will last so long as I can keep it from freezing. BUT we're in central Texas... it rarely freezes, let alone very hard.