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Old 06-05-2016, 08:00 PM   #1
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Removing Vacuum Break from Black Flusher (moved from ROO Thread)

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Originally Posted by OldCoot View Post
Was deposited in the garbage can. Don't need a vacuum break on a pressure water line and the tank is vented anyway. Works just fine if not better due to getting rid of the 90d elbow.

I agree the back pressure is an issue but this can pose a serious health risk removing the valve. If there is a water pump issue and the pressure drops... you know the rest.
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Old 06-05-2016, 08:16 PM   #2
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I agree the back pressure is an issue but this can pose a serious health risk removing the valve. If there is a water pump issue and the pressure drops... you know the rest.
The water pump isn't connected to the black tank flush in any manner. They are 2 completely separate systems.
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Old 06-05-2016, 08:24 PM   #3
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The water pump isn't connected to the black tank flush in any manner. They are 2 completely separate systems.
The water pump that provides pressurized city style water. I am aware they water pump in the trailer does not run the black flush.

My local park water system had a power failure and it sucked someones homemade black flush back into the system, no pressure break. Was polluted for several weeks. The guy was asked to remove his trailer from the park the following week, had been there for 20 years with this illegal and unsafe setup.
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Old 06-05-2016, 08:31 PM   #4
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The water pump that provides pressurized city style water. I am aware they water pump in the trailer does not run the black flush.

My local park water system had a power failure and it sucked someones homemade black flush back into the system, no pressure break. Was polluted for several weeks. The guy was asked to remove his trailer from the park the following week, had been there for 20 years with this illegal and unsafe setup.
He must of had a fresh water hose connected to the black tank flush and had the faucet open. No hose connected unless flushing on mine. I think in your example something is missing more than the lack of a pressure break. Like I said before, they are two separate systems and not connected in any way.
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Old 06-05-2016, 09:17 PM   #5
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The water pump that provides pressurized city style water. I am aware they water pump in the trailer does not run the black flush.

My local park water system had a power failure and it sucked someones homemade black flush back into the system, no pressure break. Was polluted for several weeks. The guy was asked to remove his trailer from the park the following week, had been there for 20 years with this illegal and unsafe setup.
Old Coot is correct on this one. If that individual created his own flush system and it caused issues he did something very strange. We need Paul Harvey. Here is the typical factory install clean out system. It is an independent isolated system unto itself. I think the vacuum breaker/backflow preventer (vbbp) is overkill with the way the tubing is routed in our type of environment (rv's). Old Coot eliminated a lot of tubing and the vbbp shown but he does have a check valve at the input port for his cleanout. JMO
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Old 06-05-2016, 09:28 PM   #6
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Agreed, water pressure that provides the inability for return flow. It can happen, has in a small town in Ontario 7 People died due to Ecoli contamination of a municipal water supply, I am just playing the safe card here. a external pressure break could be used.


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Old 06-05-2016, 09:33 PM   #7
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Old Coot is correct on this one. If that individual created his own flush system and it caused issues he did something very strange. We need Paul Harvey. Here is the typical factory install clean out system. It is an independent isolated system unto itself. I think the vacuum breaker/backflow preventer (vbbp) is overkill with the way the tubing is routed in our type of environment (rv's). Old Coot eliminated a lot of tubing and the vbbp shown but he does have a check valve at the input port for his cleanout. JMO
It is against code RVIA and just about any municipality

From RVIA

Plumbing Systems as specified in NFPA 1192 Standard for RVs.
Only listed plumbing devices, fixtures and appliances that have been labeled by nationally recognized testing agencies are allowed.
Water distribution systems are sized to provide adequate flow rate and designed to prevent backflow contamination.
Fixtures with traps and vents must be provided to protect against siphonage and back pressure.
Vents to release gases from any waste holding tank must be provided.

Check Valve is a modification to a code requirement. A step but not replacement for the Vacuum Breaker.
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Old 06-05-2016, 09:48 PM   #8
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It is against code RVIA and just about any municipality...Check Valve is a modification to a code requirement. A step but not replacement for the Vacuum Breaker.

JMO, but I think you are comparing apples to oranges. The black tank is vented thru the roof. The backflow preventer I removed was a duplicate as I already had a factory installed backflow preventer at the hose inlet as shown in the picture.
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Old 06-05-2016, 09:55 PM   #9
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Quote:
Originally Posted by B and B View Post
It is against code RVIA and just about any municipality

From RVIA

Plumbing Systems as specified in NFPA 1192 Standard for RVs.
Only listed plumbing devices, fixtures and appliances that have been labeled by nationally recognized testing agencies are allowed.
Water distribution systems are sized to provide adequate flow rate and designed to prevent backflow contamination.
Fixtures with traps and vents must be provided to protect against siphonage and back pressure.
Vents to release gases from any waste holding tank must be provided.

Check Valve is a modification to a code requirement. A step but not replacement for the Vacuum Breaker.

Then my camco black tank flush your saying is illegal? It is hooked up exactly as Old Coot has suggested and per the Manufacturers instruction.
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Old 06-05-2016, 10:04 PM   #10
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JMO, but I think you are comparing apples to oranges. The black tank is vented thru the roof. The backflow preventer I removed was a duplicate as I already had a factory installed backflow preventer at the hose inlet as shown in the picture.
You are legal then, I will do the same when mine fails.
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