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Old 04-30-2018, 06:22 PM   #1
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Black tank flush.

Does the Black Tank flush require the pressure regulator as the city water connection does?
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Old 04-30-2018, 06:33 PM   #2
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Yes and no. I would assume that the plumbing for it has the same ratings that the rest of the onboard plumbing does. And I therefore don’t want to damage it.

I use a splitter at the water supply. Pressure regulator, splitter, filter on one side, potable water hose. My tank rinse hose goes on the other side, then a back flow preventer.
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Old 04-30-2018, 06:49 PM   #3
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In theory, the restriction in the lines and nozzle could cause the running pressure to be high enough to cause concern. Remember, the fittings and anti-syphon valve are the same quality as the rest of your plumbing. As such, if you are in a place where you're concerned about high pressure, and your flushing at a full hookup sight, I would use an adjustable pressure regulator, and set it while the water is running.

Personally, I rarely use a regulator on sight for regular water I've never used one at a dump station for the flush.
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Old 04-30-2018, 07:10 PM   #4
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The flush doesn’t have a shut-off valve at the far end like a sink so I’d expect a regulator on the flush is not required unless the CG pressure is extreme. That said, similar to “Beach”, my water setup has the reg is at the CG bib followed by hose close to my water cabinet where I have 2 “Y” splitters connected by a back flow preventer. One side supplies the 5th and the side protected by the backflow supplies the flush and my “pump” on the sewer line (a Sewer Solution).
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Old 05-01-2018, 08:53 AM   #5
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Since the black tank flush is not a closed system (so to speak), I don't use a pressure regulator. I want as much pressure as I can get to wash out the "stuff". Like Redhorse, I use the Sewer Solution so one side of the Y has a regulator and the other side does not. On the side that doesn't have the regulator, I put another Y and on that, one hose goes to the SS and the other hose to the flush. Sounds kinda sick doesn't it?
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Old 05-01-2018, 09:15 AM   #6
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Unless you have over 150psi coming out of the bib..you don't need a regulator to flush the black tank. The plumbing in newer units are stronger than you think. When I dropped my black tank last year to replace the sensors, I was impressed.
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Old 05-01-2018, 11:06 AM   #7
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Trout, you make a good point about having pressure at the SS and flush line. I’ve just got mine set up so the regulator is first thing in the food chain.
I find it’s easier to leave behind that way :-(
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Old 05-01-2018, 06:34 PM   #8
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However, with the above posts, make sure you have the black tank drain open. I was told that if you flow water thru the rinse with nothing open you might blow a seal from over pressure in the black tank.
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Old 05-01-2018, 06:55 PM   #9
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Quote:
Originally Posted by rockaw View Post
However, with the above posts, make sure you have the black tank drain open. I was told that if you flow water thru the rinse with nothing open you might blow a seal from over pressure in the black tank.


There’s a vent pipe in the tanks so it should t be an issue
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Old 05-01-2018, 06:55 PM   #10
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However, with the above posts, make sure you have the black tank drain open. I was told that if you flow water thru the rinse with nothing open you might blow a seal from over pressure in the black tank.
I don’t think that’s correct as the black has a vent to the roof. The danger is filling the black and the “water” has no place to go but up thru the toilet or up the vent (don’t ask how I know this). That point made, I routinely close the dump while the flush is running but try to remain conscious of the level. The point is to dislodge the “bits” clinging inside.
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