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Old 04-29-2007, 11:53 AM   #1
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How to replace dump valve?

I poured some water in the toilet and confirmed the dump valve is indeed not closing all the way. I'm not sure that explains why I was leaking at the belly pan below the holding tank but I obviously need to replace the valve. (see post below regarding leak)

It appears that the black tank just slips into the valve and on the ovehter side it connects to a Y where the grey tank joins in downstream to the main drainline.

How do I remove the valve? Do I unscrew the valve handle first inside the bumper and then simply "reef on" the slip fittings or is there a logical way? Seems that the grey tank line and main dump line are all pretty tight so I'm not sure how it all comes apart?

Any help or redirection to possible treads is appreciated.

Dan
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Old 04-29-2007, 12:27 PM   #2
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Dan, here's a good thread for you:

http://www.airforums.com/forums/f444...ves-28812.html

Nick.
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Old 04-29-2007, 12:36 PM   #3
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....so, do I really need to cut through one of the pipes?

Dan
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Old 04-29-2007, 01:02 PM   #4
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Quote:
Originally Posted by Dan S
I poured some water in the toilet and confirmed the dump valve is indeed not closing all the way. I'm not sure that explains why I was leaking at the belly pan below the holding tank but I obviously need to replace the valve. (see post below regarding leak)

It appears that the black tank just slips into the valve and on the ovehter side it connects to a Y where the grey tank joins in downstream to the main drainline.

How do I remove the valve? Do I unscrew the valve handle first inside the bumper and then simply "reef on" the slip fittings or is there a logical way? Seems that the grey tank line and main dump line are all pretty tight so I'm not sure how it all comes apart?

Any help or redirection to possible treads is appreciated.

Dan
Here is a pic of the valves disassembled. I did not have to cut anything.

Check this out too

AirStream Project 2004
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Old 04-29-2007, 07:44 PM   #5
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If the valves are rebuildable you may not have to cut anything. Just be careful taking out all the screws and separating the halves. When you put it together, don't crack the housing by crunching the screws down. If you have to replace a valve, be careful to take careful measurements and photos because you will have to get everything together pretty close to what it was or the handles won't work.
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Old 04-29-2007, 10:06 PM   #6
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Dan - I just replaced the Thetford on a 73 Safari with a Valterra valve. On the 73 the Thetford Valve was threaded into the black tank and below the valve was the Y connector for the Gray Water to drain. We had to cut the pipe that delivered the gray water and we also had to do a little cutting on the old thetford valve itself to loosen up the threads. Once it was out, assembly of the new valve and installation was pretty straight forward. If you have pics of you situation please post. Good luck.
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Old 04-30-2007, 12:33 PM   #7
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I re-built my valves, so no disconnection of the valves from the pipes was required. My Airstream manual says that if new valves are fitted, the old ones can be removed from the pipe by levering a screwcriver in the joint, working all the way round the circumference, and about the second time round, the valve should pop off. The manual also states that, at the factory, the usual pracice is to rebuild the valves. If time is not important, I recommend fitting new valves, as the internals are often badly scored.
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Old 04-30-2007, 03:46 PM   #8
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dan

are you certain it is the valve?

last fall i helped dave and pat rebuild their valve/drain system on their argosy 20.

it wasn't the valve but everything else that was broken due to the drain pipe hitting the pavement when going over inclines.

we reworked the tail piece so that it is more recessed, less chance of getting hit.

we shoulda took pictures!

ps, cutting a good sized hole to work through helps alot! you can always patch it later!

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Old 04-30-2007, 04:36 PM   #9
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Quote:
Originally Posted by Dan S
I poured some water in the toilet and confirmed the dump valve is indeed not closing all the way.
If the valve isn't closing all the way, is it because "paper debris" is lodged in the groove? If so, it can be an easy fix, clean it out gently with a bent coat hanger. Just be careful not to be too agressive that you damage the gasket/seal...

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Old 05-01-2007, 12:07 AM   #10
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If the valve isn't closing all the way, is it because "paper debris" is lodged in the groove? If so, it can be an easy fix, clean it out gently with a bent coat hanger.Shari
Shari, I think we're talking about the dump valves on the exit from the tanks, not the valve at the base of the toilet bowl, where your suggested fix is appropriate.
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Old 05-01-2007, 06:26 PM   #11
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You take the four bolts on the flange out........they're probably rusted together.... when they come out you pull the lower part down and slide the center "valve" section out. The upper section of the " Dumper" screws in to the tank so you can change it too.. its only a few bucks. Attach the septic hose to the dump drain while your working on it..........

Albert Pujols
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