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Old 12-15-2009, 07:58 PM   #393
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Originally Posted by FC7039 View Post
Would you not need a vent to relieve the build up of gas? If the the tank is "sealed", then I would think back pressure would interfere with the one way valve.

Found this on YouTube, a couple of guys tested the backflow resistance of the valve. Perhaps you can visualize that as the backpressure increases it places more force on the membrane to remain closed. That is, as demonstrated in the YouTube video, until the backpressure becomes sufficient to force the entire membrane to reverse itself.


YouTube - Fanny trap tested to destruction
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Old 12-15-2009, 09:12 PM   #394
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I have the same concern about backpressure. If you have a sealed tank with no external vent, then any fermentation in the gray water tank would exert backpressure on the downstream side of the valve and prevent free drainage of the shower.

A few inches of backpressure on the tank side of the valve could cause a few inches of backup in the shower.

Not a problem if you also have a regular tank vent. Or if you keep the pH of the graywater high enough to prevent fermentation.

Otherwise, might be a problem.
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Old 12-16-2009, 05:02 PM   #395
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I have the same concern about backpressure. If you have a sealed tank with no external vent, then any fermentation in the gray water tank would exert backpressure on the downstream side of the valve and prevent free drainage of the shower.

A few inches of backpressure on the tank side of the valve could cause a few inches of backup in the shower.

Not a problem if you also have a regular tank vent. Or if you keep the pH of the graywater high enough to prevent fermentation.

Otherwise, might be a problem.
All of my tanks will be vented to the atmosphere, the shower will have its own gray water tank. The reason that I going with the Hepvo is space, I'm micro managing the space.

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Old 12-16-2009, 09:43 PM   #396
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re-build

toaste, i have read all your post tonite. wow, that is all good stuff. way to go. your AS will be better then new and better then the new ones. AS should take notice. anyways, great job, great post, very interesting. thanks, can't wait to see the finnish of this.

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Old 12-16-2009, 11:19 PM   #397
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Would you not need a vent to relieve the build up of gas? If the the tank is "sealed", then I would think back pressure would interfere with the one way valve.
I was thinking some more about this and I think that you are right about still needing to vent the tanks.

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Old 12-22-2009, 12:03 PM   #398
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Thinking about running the sewer hose through the sewer hose holder kit, then, permantanly fastening the hose to dump valve and design it that the kit can pivot. Any other ideas out there with pictures?????

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Old 12-22-2009, 12:29 PM   #399
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Old 12-22-2009, 12:57 PM   #400
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That's is a great idea, I knew that there had to be something out there in this multi billion dollar rv business, thanks for sharing.

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Old 12-22-2009, 05:27 PM   #401
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And now for the disclaimer: I have only seen this on you tube. I do not own one or sell them. I just remember seeing the video a while back and your post reminded me of it. That being said I would want to hold one and fidget with it before purchasing. I think that they may hang too low for safe travel. I think if it were me I would find a way to "wrap" it in aluminum so it would match the rest of the trailer.
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Old 12-22-2009, 07:55 PM   #402
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And now for the disclaimer: I have only seen this on you tube. I do not own one or sell them. I just remember seeing the video a while back and your post reminded me of it. That being said I would want to hold one and fidget with it before purchasing. I think that they may hang too low for safe travel. I think if it were me I would find a way to "wrap" it in aluminum so it would match the rest of the trailer.
After watching a few of there videos on the web I noticed that they
are using double o'rings which would make for a poor design.
O'rings are normal used on stationary parts, not on parts
that rotate and telescoping.

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Old 12-22-2009, 08:50 PM   #403
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Here is another design that I found on the web. Leaning toward this design, cheaper.........

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Old 12-22-2009, 09:04 PM   #404
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That's brilliant!! Very easy modification, easy to undo later... I like that. Would work well on early 60's tanks that dump straight down out the floor
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Old 12-22-2009, 09:11 PM   #405
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That's brilliant!! Very easy modification, easy to undo later... I like that. Would work well on early 60's tanks that dump straight down out the floor
Plus the hose should give you plenty of flexibility for pivoting.
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Old 12-23-2009, 06:39 AM   #406
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I suggest your keep that stinky slinky outside of the trailer though. They do wear out and a split in the hose might not be too pleasant inside the rig.
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