OT Landscapers Need help with sprinklers

Once installed you should only have to open both valves for it to work properly.

How old is your system? newer systems in some states require another isolation valve after the backflow connection. A plain ball valve. Just double check that.

I'm more familiar with febco baclflows but both valves are turned to open and no flow to irrigation system?

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There are two release valves and only one spews water when open.

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So the screws that helped drain or check for flow? Whcih one, before or after the bell?

It's the model 800 on that link. There are two test cocks. One gives water when open, one doesn't. I watched a YouTube video and read directions. It's 3 steps. Turn water off, install, turn on. On videos it made a noise when the vacuum hit. Mine doesn't.
The screws just hold the cover that leads to the inners, but I'm worried about taking the inners out.
This seems like an item where the failure rate would be low. I don't get what's wrong.

I am totally unfamiliar with this type of thing, but I have to ask a stupid question. A back flow preventer would, by its nature, only allow flow in one direction....are you sure it is not installed backwards?

Inb4 checkthefetzorvalve