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Old 08-22-2011, 12:23 PM   #1
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Anyone know what kind of dump valve this is?

It's in a 1971 Ford F350 Scamper Motorhome. Black tank only - it doesn't have a gray tank. The valve worked fine the first few times we used it, but now it is stuck open. This is a better way to have it go I imagine, as having it stuck closed would be a much worse predicament!

Anyway I have searched online for dump valves but they all seem to be a pull handle with a slider-type of valve. Mine is a lever that seems to rotate some kind of flapper valve, though I'm not sure. We took off what appears to be a cleanout and you could see what looked like a flapper laying there on the bottom of the pipe.

Does anyone know what kind of dump valve this is? Below are the pics. The first pic shows the lever forward and the valve shut, the second pic shows the lever pushed to the rear of the RV and the valve open.

Thanks for any help,

Cindy
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Old 08-22-2011, 12:40 PM   #2
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After you get enough courage or what ever it takes to open a BLACK tank valve with no hose attached.... I would simply leave it open and install a more common slide valve where the plug is now.
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Old 08-22-2011, 12:51 PM   #3
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After you get enough courage or what ever it takes to open a BLACK tank valve with no hose attached.... I would simply leave it open and install a more common slide valve where the plug is now.
Haha, no worries - the hose was attached during the last dump, and I had thorough rinsed the tank with fresh water so there was nothing foul left to come out of it. I closed the valve and took the hose off, but left the cap off the pipe as I wanted to make sure nothing was leaking before the next trip. I flushed the toilet a couple of times with just water before I put the toilet treatment in, and noticed it pour straight out of the pipe even though it was supposed to be closed.

The slide type valves don't look like they attach the same way - it looks like they have a square attachment with four mounting bolts. The one I have is round with what looks like six or more bolts.

Cindy
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Old 08-22-2011, 02:48 PM   #4
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I would cut that stuff off with a saw, and install a new proper dump system and valve.
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Old 08-22-2011, 03:47 PM   #5
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Cindy,
I think you can say this is one of them age things. It is so old you have the only one left in existance. I believe you are simply going to have to convert to a modern style dump valve which is going to take some planning and forthought.

Good Luck,
Dave
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Old 08-22-2011, 04:14 PM   #6
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Ahhh poop! (pun intended ) I thought it was a easy fix that we could do ourselves, now it sounds like it will probably have to go to an RV repair shop. I've sent a message (with the pics) to one of the guys who used to build these campers as a last hope that he'll have a solution.

Thanks for the replies,

Cindy
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Old 08-22-2011, 07:00 PM   #7
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Looks like you could unbolt the device and see what's jamming the flapper - that doesn't cost anything and if you can't fix it your likely going to toss that part anyway and replace the plumbing with something std.
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Old 08-22-2011, 07:26 PM   #8
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Looks like you could unbolt the device and see what's jamming the flapper - that doesn't cost anything and if you can't fix it your likely going to toss that part anyway and replace the plumbing with something std.
Yes, we're going to try that first. Fingers are crossed we can get it functional again until the end of the season and put off re-plumbing it until next year.

Thanks again,

Cindy
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Old 08-22-2011, 08:17 PM   #9
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Old 08-22-2011, 10:48 PM   #10
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I came across that in my searches, but if I put that on my grey water has where to go (no grey tank so grey water goes right onto the ground). Thanks for pointing it out though.

Cindy
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Old 08-23-2011, 08:11 PM   #11
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Well I heard back from the gentleman who use to build Scamper Motorhomes. I sent him pics of the dump valve, and he told me that those valves haven't been available for 30 years or so and he's surprised mine was still operational until now. He has given me a step-by-step how to on how to upgrade the valve to a modern one, so that's what we're going to do.

Thanks for all the replies, they were very much appreciated!

Cindy

PS - Maybe my old dump valve should be in a museum somewhere! Haha
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Old 09-05-2011, 10:34 PM   #12
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lol Ya my "Butterfly valve" as i called it was not working so i installed a new style gate valve and it works great. I'd have to crawl under and look at it again to see what I did exactley but works perfect and has never given me any problems...it did freeze up one winter so I wraped a set of 12v handle bar warmers from a quad/four wheeler/motorcycle on the dump valve and it worked like a charm.
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Old 09-05-2011, 10:39 PM   #13
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lol Ya my "Butterfly valve" as i called it was not working so i installed a new style gate valve and it works great. I'd have to crawl under and look at it again to see what I did exactley but works perfect and has never given me any problems...it did freeze up one winter so I wraped a set of 12v handle bar warmers from a quad/four wheeler/motorcycle on the dump valve and it worked like a charm.
We bought a new Valterra dump valve assembly, put it on ourselves no problem and it works great! It feels good to do something yourself and actually have it work. I'm very proud of our new modern dump valve! haha

Cindy
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Old 09-05-2011, 10:51 PM   #14
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Ya and that is not the place to have it "not work"..lol
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