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Old 10-08-2017, 07:54 AM   #1
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Black Tank Flush Pressure

Hi folks. I appreciate all the feedback on use of water regulators on fresh water line. Now, it doesn't appear that the black flush system has a pressure regulator built in as the fresh does. So, do most of you use a regulator at the spigot for flushing the black tank? Just trying to make sure I don't burst something.
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Old 10-08-2017, 08:42 AM   #2
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We took ours off because at our campground the water pressure at the spigot that drawing it from the fresh water tank with the pump is better.
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Old 10-08-2017, 10:28 AM   #3
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Originally Posted by lukeysh714 View Post
Hi folks. I appreciate all the feedback on use of water regulators on fresh water line. Now, it doesn't appear that the black flush system has a pressure regulator built in as the fresh does. So, do most of you use a regulator at the spigot for flushing the black tank? Just trying to make sure I don't burst something.

You would think I'd have thought about this, but never have. I simply hook up one of the self collapsing hoses directly and run it full for about two minutes, shut the water off and let it flow. I do this as often as possible while traveling if I have time but really do it when we are putting the trailer away for the winter, or until we head south.

But, now you have me thinking, just a bit.

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Old 10-08-2017, 10:36 AM   #4
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I do use a regulator at the spigot, always have. Most of the time it isn’t really needed but I have been to a couple of place where the water pressure seemed too HIGH. Some places the water pressure is too low but I still use the regulator just the same. It is part of my arrival and departure check list. So far it worked great for me.
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Old 10-08-2017, 10:53 AM   #5
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Quote:
Originally Posted by lukeysh714 View Post
Hi folks. I appreciate all the feedback on use of water regulators on fresh water line. Now, it doesn't appear that the black flush system has a pressure regulator built in as the fresh does. So, do most of you use a regulator at the spigot for flushing the black tank? Just trying to make sure I don't burst something.
There is no need to regulate pressure on the back tank flush (unless it becomes plugged). Inside the black tank there is open end spray nozzle that lets the water go through with very little pressure buildup on the supply pipe. The pressurized spray and free water flow is what cleans the debris out of the tank.

I think in the case of the back tank flush, more water pressure/flow is better.
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Old 10-08-2017, 11:54 AM   #6
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I think in the case of the back tank flush, more water pressure/flow is better.
I blew the top off the cheap backflow preventer airstream installed with too much pressure.
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Old 10-08-2017, 12:31 PM   #7
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I blew the top off the cheap backflow preventer airstream installed with too much pressure.
I agree, those cheap plastic valves are junk, and they fail occasionally.

Is it possible the plastic valve had a little water left inside, that froze over the winter?

I've used unregulated water pressure on my several different Airstreams, for more than 25 years. I've had no damage,,, yet.
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Old 10-08-2017, 12:41 PM   #8
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I agree, those cheap plastic valves are junk, and they fail occasionally.

Is it possible the plastic valve had a little water left inside, that froze over the winter?

I've used unregulated water pressure on my several different Airstreams, for more than 25 years. I've had no damage,,, yet.
Don't think so. It was when my trailer was new and the campsite did have really high pressure.

I've removed the valve and just inserted an elbow in its place.
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Old 10-08-2017, 01:54 PM   #9
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Don't think so. It was when my trailer was new and the campsite did have really high pressure.

I've removed the valve and just inserted an elbow in its place.
Where was/is that valve on a17 classic?
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Old 10-08-2017, 04:39 PM   #10
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Where was/is that valve on a17 classic?
Not sure. Mine is a '14 bunk. It was behind a closet right above the inlet. I suspect yours is above the inlet as well.
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Old 10-08-2017, 05:03 PM   #11
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Access on my 14 30' FC is under the bathroom sink it's on the outboard wall near the black water flush inlet. It's easy to see not so easy to work on. Mine failed and was replaced under warranty. As other have said it's made of clear plastic. If it fails now I would replace with an elbow as well.
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Old 10-08-2017, 05:47 PM   #12
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Access on my 14 30' FC is under the bathroom sink it's on the outboard wall near the black water flush inlet. It's easy to see not so easy to work on. Mine failed and was replaced under warranty. As other have said it's made of clear plastic. If it fails now I would replace with an elbow as well.
Mine was a real pain to get to. That's one reason I went to an elbow. Didn't want to deal with it again.
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Old 10-08-2017, 06:17 PM   #13
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I tend not to use full open pressure with the black tank flush. They are notorious for blowing out, and ours is nearly impossible to get to without removing the vanity, so I'd rather take it easy and rely on the volume of water in the black tank to carry everything out rather than high pressure spraying action. I run it until the black tank is about 3/4 full and cut it loose ... then repeat until it runs clear. (We don't usually do the "full" flush while on the road, between campgrounds until it's time to go home.)
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Old 10-09-2017, 11:08 AM   #14
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Never thought about it.
I guess you want high pressure to blast the black tank.
Not sure the black tank flush system can be damaged by high pressure since it is basically designed for some pressure and the water has an outlet- the nozzles in the tank.
It's amazing that some folks think to ask things that never crossed my mind...
No trouble with pressure in the black tank flush system so far 7 years in.
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Old 10-09-2017, 12:21 PM   #15
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Quote:
Originally Posted by lukeysh714 View Post
Hi folks. I appreciate all the feedback on use of water regulators on fresh water line. Now, it doesn't appear that the black flush system has a pressure regulator built in as the fresh does. So, do most of you use a regulator at the spigot for flushing the black tank? Just trying to make sure I don't burst something.
The black water tank has an external vent on the roof and thus you cannot pressurize the tank so no need to worry about too much pressure. Descent pressure and volume are needed to clean the tank.
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Old 10-09-2017, 03:16 PM   #16
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At the last CG that I was at, the water pressure was 80 PSI.
I use a Valtera pressure reg for supply to the trailer; but for the tank flush, I just use direct pressure. It worked great. No problems yet.
But looking inside that area under the bathroom sink, I do not see a "plastic" valve assy.
Looks like brass.
Am I looking at the right thing? (On a 2016 30' FC, that's listing For Sale.)
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Old 10-09-2017, 09:49 PM   #17
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I plugged up a no-fuss-flush valve by letting the black tank fill too full and sitting a while. I could not get city water pressure to un-block it. While at Jackson Center a service tech un-blocked it in the shop. He said the city water pressure was a lot higher in Jackson Center than most. It has been OK since with no leaks or damage. Next time I will use compressed air till it blows clean.
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Old 10-10-2017, 05:09 AM   #18
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I simply hook up one of the self collapsing hoses directly
I hope it's a hose dedicated to this and not also used for your city water connection.
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