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Old 05-17-2012, 03:26 PM   #1
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Please explain the purpose of the vacuum breaker with the Tornado flusher.

I understand the concept of adding a back flow preventer to the flush line. But I don't get what the vacuum breaker is supposed to be doing. Can someone explain that for me? Or point me to an explanation?

Thanks!
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Old 05-17-2012, 04:33 PM   #2
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Originally Posted by BeagleIL View Post
I understand the concept of adding a back flow preventer to the flush line. But I don't get what the vacuum breaker is supposed to be doing. Can someone explain that for me? Or point me to an explanation?

Thanks!
The black tank flush is located on the side of the black tank and if the black tank is used to capacity it can siphon overboard through the flush line without it.

It also prevents pressurized black water from entering the flush hose if the pressure in the hose fluctuates.

It is not only a back flow preventer valve but an anti-siphon valve.
Does that help?
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Old 05-17-2012, 05:08 PM   #3
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It was my understanding that there is a check valve inside the head of the Tornado that prevents the back flow. And when I blew through the vacuum breaker (clean and new out of the box!) it appeared to pass air in both directions...
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Old 05-17-2012, 05:15 PM   #4
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It was my understanding that there is a check valve inside the head of the Tornado that prevents the back flow. And when I blew through the vacuum breaker (clean and new out of the box!) it appeared to pass air in both directions...
That could be true in the Roo. I can't speak to that. No paperwork came with the flusher in my Flagstaff, so I have no way to verify if that is true in mine. However I DO have a anti-siphon valve under my vanity whose sole purpose in life is to keep poo off my shoes when I flush the black tank.

This is not my anti-siphon valve, but mine looks identical.
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Old 05-17-2012, 06:09 PM   #5
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Quite simply, it's a plumbing code requirement.

Any time that you "connect" potable water to waste water there has to be either an air gap or a vacuum break. Should the hose be connected, and for whatever reason, the water system loose pressure, then gravity could cause contaminated water to siphon into the potable water. A backflow preventer (check-valve), if stuck open, will not stop this siphoning. An air gap or a vcuum breaker will.
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