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Old 11-10-2015, 11:32 AM   #1
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Black Tank Flush

Hello all - One question about using the black tank flush valve; should I use the water pressure regulator on the hose I attach to the black tank flush connection? I have been using the lower pressure, but was curious how others hooked up. Thanks, Matt
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Old 11-10-2015, 11:37 AM   #2
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It seems to be a pretty even split between those that do and those that don't.
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Old 11-10-2015, 12:13 PM   #3
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It seems to be a pretty even split between those that do and those that don't.
Thanks - This is our first one with an external flush location, and I'm a little concerned about allowing too much pressure and having a blowout. I've already had to stretch into a very unhandy place to fix a leaky water filter, and really don't want black tank issues...Matt
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Old 11-10-2015, 12:14 PM   #4
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For what it's worth, I haven't used a pressure regulator on my black tank flush in probably 200+ nights of camping (not that many flushes/dumps, of course).
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Old 11-10-2015, 12:16 PM   #5
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I didn't used to use a pressure regulator, but have started to as I had a spare anyway.

The Black flush runs to what is basically a sprinkler head that lets water out, so it would probably take very high pressure to cause an issue. But since high pressure might damage something that's buried inside your Black tank (or a hose leading to it), it doesn't hurt to use one.
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Old 11-16-2015, 09:22 AM   #6
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Never have in almost two years. I figure the more pressure at the spray head the better but I could be wrong, time will tell.
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Old 11-16-2015, 10:10 AM   #7
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I've never used one on my black flush either.
Being it's an open ended system (nothing to hold/build pressure) there isn't much chance you'll ever see a spike of pressure inside the flush lines high enough to create any problems. 'Maybe' with the chincy, plastic anti-siphon/check valve... but that's another topic.
Like was mentioned... the more pressure you can give it, the better the flush.
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Old 11-16-2015, 10:20 AM   #8
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I never use a regulator on my black water flush. I have a 2 spicket faucet that I screw onto the campground water, one spicket has the regulator for city water, the 2nd one does not have a regulator and the black water hose is attached to it.
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Old 11-16-2015, 11:32 AM   #9
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I only use the black tank flush when the camper is home. My house water pressure is 80psi. Maybe the RV system can handle this pressure - and maybe not. I know I don't want to be screwing around with any black tank issues. I use a regulator.
I disagree that this is an open-ended system. Those little sprinkler openings by themselves will build pressure as they are restricting flow.
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Old 11-16-2015, 11:51 AM   #10
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I only use the black tank flush when the camper is home. My house water pressure is 80psi. Maybe the RV system can handle this pressure - and maybe not. I know I don't want to be screwing around with any black tank issues. I use a regulator.
I disagree that this is an open-ended system. Those little sprinkler openings by themselves will build pressure as they are restricting flow.
Sure they 'restrict' the flow somewhat but they wont build pressure or hold it when shut off unless your hose/supply is full of debris and clogs them.

It's open ended because there is nothing that closes off the water flow.
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Old 11-16-2015, 11:57 AM   #11
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My FR installed black tank cleanout backflow preventer is rated to 125psi (mine is the clear plastic one). I think this is typical of all FR black tank cleanout installs (including the black plastic ones).
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Old 11-16-2015, 01:04 PM   #12
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I never use a regulator on my black water flush. I have a 2 spicket faucet that I screw onto the campground water, one spicket has the regulator for city water, the 2nd one does not have a regulator and the black water hose is attached to it.

That setup should have a back flow preventer! 😨


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Old 11-16-2015, 01:10 PM   #13
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That setup should have a back flow preventer! ��


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There is a backflow preventer in line somewhere within the unit installed by FR. He was only talking about the external input to the flusher.
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Old 11-16-2015, 03:11 PM   #14
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Black Tank Flush

Just to prevent sewer going into the campground water system, or looping back into your own RV through the other spigot when it's directly connected through that dual spigot to the black water hose, that's all.

$#%t happens.


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Old 11-16-2015, 03:20 PM   #15
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Ain't gonna happen. Backflow valve is probably 4 to 5 feet above black tank and besides only used when emptying tank. What's to loop? It's all potable water in the cleanout lines.
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Old 11-16-2015, 08:56 PM   #16
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This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.

Sewer isn't supposed to gush out the stack vent on the roof either, right?

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Old 11-16-2015, 10:28 PM   #17
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It's a direct connection, so no pressure regulator.

Quote:
Originally Posted by steveanson View Post
Hello all - One question about using the black tank flush valve; should I use the water pressure regulator on the hose I attach to the black tank flush connection? I have been using the lower pressure, but was curious how others hooked up. Thanks, Matt

I don't use a regulator because it's a direct connection in to the black tank. I like the high pressure flush I get all the crud out with one or two flushes. I checked my connection there is no pex joints to blow apart so I elected to blast the poop outta my black tank. I would read your owners manual regarding the feature, and then make sure it isn't a plumbed connection. If it has joints in line I would definitely follow the 35 PSI regulator. Anyway that was my rationale.

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Old 11-16-2015, 10:33 PM   #18
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That's just gross

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This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.

Sewer isn't supposed to gush out the stack vent on the roof either, right?

Attachment 94441


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That diagram leaves a bitter taste in my mouth...
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Old 11-16-2015, 10:57 PM   #19
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This (see drawing). Because the sewer system has been connected to the city water system. Sorry but it's true as described.

Sewer isn't supposed to gush out the stack vent on the roof either, right?

Attachment 94441


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Actually, it's more like this dwg. The input to the tank is no more than 2 inches from the top. The dump valve is open when cleaning out so where does the water that you say may backflow come from?
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Old 11-16-2015, 11:44 PM   #20
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Actually, it's more like this dwg. The input to the tank is no more than 2 inches from the top. The dump valve is open when cleaning out so where does the water that you say may backflow come from?
The same place it comes from when it gushes out the top of the stack vent - from a closed BW tank which someone forgot to leave open and then got called to do something else urgently and then whoops someone ran the sink too and now your FW system is contaminated as is the line to the park water.

I'm sure you are quite careful and will turn off the spigot that is connected to the FW line during this process and never leave the BW tank closed or the flush unattended, for which we all thank you. Nevertheless.
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