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Old 09-30-2020, 10:32 AM   #1
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Default Back flow preventer

For a sprinkler system. It isnít supposed to be covered up like this one is, right? I feel like it could be a code violation but idk. My sprinklers wouldnít shut off and when I finally said F it, I started digging and I found it. Naturally it was rusted AF and I could only turn one handle before the both broke off. I think my only option is to remove all that stone to expose the box. Have you ever seen somethin like this?
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Old 09-30-2020, 03:40 PM   #2
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I donít see anything in the pic but yeah a back flow preventer aka double check goes in a meter box and needs an (air gap) room beneath it.
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Old 09-30-2020, 04:18 PM   #3
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Itís underneath all that landscaping! I had to dig out those bushes and everything to get to it! Who does that?! of course itís gonna rust, it gets flooded every time the bushes get watered.
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Old 10-01-2020, 06:55 PM   #4
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Your backflow valves should be brass, or something similar, and not rust right? My fire sprinkler guy said that the yard uses the same exact backflow preventer valves and the ones in the fire system appear to be brass. My yard sprinkler on/off cutoff valves are plastic.
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Old 10-01-2020, 07:07 PM   #5
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Sprinkler valves are usually plastic. The double check valves are typically part of the double check, itís a whole assembly. And yes the double check valves are brass.
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Old 10-01-2020, 07:20 PM   #6
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I just re-read your post. The brass wonít typically rust but the other hardware on a double check will. Brass and stainless can corrode when buried. Certain soils attack metal more than others. Copper can corrode too.
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Old 10-02-2020, 07:40 AM   #7
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But have yíall ever seen one that has landscaping build on top of it?
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Old 10-05-2020, 05:28 PM   #8
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I have run across a lot with landscaping on top. About 50% of the ones anywhere have the handles rusted off, a good pair of channel locks can grab the base of the collar for the handle. If you want to replace it you need to hire a licensed irrigator and pull a permit with the city.
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Old 10-05-2020, 05:31 PM   #9
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If you have plastic ball valves anywhere they are just for isolation, a control valve will have a solenoid to control it. There are 7 types of backfow prevention devices/methods but only 2-3 are typical in our area.
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Old 10-08-2020, 07:25 AM   #10
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Thanks for your reply. Why would anyone build anything that needs to be watered on top of that box? I guess Iíll just knock that crap down and call a damn plumber. Thanks again!
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