Anti-backflow valve - Page 2 - Fiberglass RV


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Old 03-20-2003, 03:24 PM   #15
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It's not just Calif PC, backflow preventers are required on ALL outside faucets spigots by most if not all US plumbing codes. They are there to prevent a hose laying in a puddle of unknown stuf, combined with a fault in the water supply, sucking up the puddle and getting it into the water system (it does happen, depending on the relatively heights of the puddle and where the water system is open).

BTW, I believe the backflow preventers for faucets are usually the spring-loaded valve type, not the air-gap type found on dishwashers and other appliances.

Our RV backflow preventers would probably meet the requirement (dunno for sure), but they are primarily intended to keep your 12VDC water from leaking out of an unused city water connection.

Where the ranger was wrong was that the CG faucet should have been equipped with a backflow preventer already!

A regulator is a good thing because I have heard several horror stories on rorv-t about bursting tubing from excessive CG pressure in big RV parks.

Pete and Rats
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Old 03-20-2003, 07:31 PM   #16
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Charles -- I believe you are correct about the pressure regulator. Also, I've noticed an increasing number of campgrounds have the backflow preventer permanently attached to the spigot.

John -- All too often, when we post something, we tell half the story for the sake of brevity, and the readers can misunderstand. If you are a courteous camper, accept our apologies if you felt we jumped down your throat. If you are a dis-courteous camper, let us jump again! ;) Live and learn, right?

Nick -- I understand, and, yes, there are those out there who retaliate, often before finding out the "rest of the story", such as John's case of misunderstanding the intent of the equipment. Had the park attendant come by and said either, "If you wish to hook up to the water supply, I'll have to ask you to run over to the camp store first and pick up a backflow preventer", or "I'm sorry -- that is a common spigot, and we can't allow you to hook up to it", much unpleasantness could have been averted. Instead, some folks go through life looking for a fight. Too bad...
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Old 03-20-2003, 07:50 PM   #17
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Call me unsympathetic, but if the park rules required a back-flow preventer, then the campground should install them. I've seen this done at a couple of parks. They just used the standard $5 version that building code requires at every exterior hose bib. A set screw breaks off after installation which prevents "loss".
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Old 03-20-2003, 08:23 PM   #18
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Marshall Brass Regulator Backflow Prevention

I just grabbed my Marshall Brass pressure regulator. I can blow through it both ways with zero effort. :m

-- Dan Meyer
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Old 03-20-2003, 10:46 PM   #19
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This forum seems to be well moderated, in the sense of primarily self moderation and otherwise when needed. I have followed other boards that are not moderated at all and have seen how un-moderated threads can degrade rapidly.

This thread seems to have touched a raw nerve with many participants that have received the short end of water bib courtesy. I fully understand even though I haven't been camping in ''camperland'' (i.e. campgrounds with running water) long enough to be exposed to some of the ''hosers'' out there. My fair share of abuse will come all too soon. When my time comes I hope I can keep my cool and not burst a hose.

Speaking of bursting a hose...:splat
Yeah.... I just had to go out to the Burro and snatch up my plastic pressure regulator. Its so cheap that the manufacturer is too embarrased to put thier name on it. By the way...it too fails in the two way blowing hot air test. If any one comes across a web source for an anti-backflow or vacuum breaker valve (maybe even a combo ABF valve and regulater) that meets the desires of the State Park anointed ones.... Please post it in this thread. I will be the first in line to plop down the scratch to get such a golden treat. No-sir-eee, sure don't want to get on the wrong side of gun toting Jonny law. Especially since we will be doing our family camp again this summer at the same state park. (possibly even the same group area) I want to come prepared especially because......I know that ranger will still have his eye on us rabble rousers!
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Old 03-21-2003, 06:29 AM   #20
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Anti-Siphon

FWIW, I was in the Home Depot yesterday for another project and I wandered by the plumbing department. The anti-siphon/vacuum breaker brass thingy was $3.95. It's definitely a one way device. It appears to be the exact device installed on all the faucets in my marina as well.
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Old 03-21-2003, 06:41 AM   #21
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Dan>>blow both ways

Thanks for checking that Dan! Once again, I was wrong (and I'm sure it won't be the last time!)!

Steve>>home depot

Well, sounds like I should run by Home Depot and pick up another toy, in case I run into a Ranger like John's.
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Old 03-21-2003, 11:14 AM   #22
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Blowing both ways isn't necessarily a test for a vacuum breaker. That would be a test for a check valve -- not quite the same thing. A check valve is a one-way valve that only allows flow one direction. A vacuum breaker is a device that allows flow both directions, but breaks the suction with air in reverse flow mode, to prevent siphoning. Air can go down the pipe, but water won't be pulled along. Look at your pressure regulator, and see if your model has little holes drilled around the perimeter. If so, it is "probably" a vacuum breaker model. If it is solid, it isn't. Both can be had.
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Old 03-21-2003, 09:05 PM   #23
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Hi All

<img src=http://www.fiberglassrv.com/board/uploads/3e7bd26fadf18T6.jpg/>

Right object is a Vacuum Breaker.Left object is a pressure reducer.
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