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Old 05-23-2019, 01:30 PM   #1
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Debris in the WH mixing valve... what are the chances?

Our Airstream is a 2014, and it has been a problem-free delight.

We have been noticing that there is probably 30% reduction in water flow when using hot water as compared to the cold water flow.

The aerators are perfectly clean, so I'm wondering if perhaps there is some 'crud' collected on the screen of the water heater mixing valve. I know that it's pretty easy to check, requiring only minor disassembly, but being a lazy lout (!), I thought that I would check with the brain trust.

As always, thanks for your help.

Robert
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Old 05-23-2019, 01:38 PM   #2
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Are you talking the sinks and the shower? If it is just the shower, I had that problem and the guts of the cheap plastic Moen valve were broken. I replaced the insert with brass and everything has been fine since.
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Old 05-23-2019, 01:42 PM   #3
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Quote:
Originally Posted by lsbrodsky View Post
Are you talking the sinks and the shower? If it is just the shower, I had that problem and the guts of the cheap plastic Moen valve were broken. I replaced the insert with brass and everything has been fine since.
Larry
Thanks, Larry, for helping me think about this. It's both sinks... I didn't even check the shower, thinking it would follow the same pattern.

Robert
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Old 05-23-2019, 04:12 PM   #4
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If you have not been religious in using an inline water filter for city water and for filling your water tank, since the trailer was new, debris in the mixing valve is a definite possibility IMO.

https://www.google.com/search?q=mixi...=airforums.com
https://www.google.com/search?q=mixi...=airforums.com

It is also possible that your mixing valve has simply started to fail.

The same debris can get into the water pump, and cause all kinds of back-flow problems into the [overflowing] water tank, when on city water:

https://www.google.com/search?q=wate...=airforums.com

Even so-called pristine city water can have grit in the lines, at times, and rural campground well water can also be full of grit.

Good luck,

Peter

PS -- Camco filter, one of many brands:

https://www.amazon.com/Camco-40645-T...gateway&sr=8-3
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Old 05-23-2019, 04:50 PM   #5
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[QUOTE=OTRA15;2244433]If you have not been religious in using an inline water filter for city water and for filling your water tank, since the trailer was new, debris in the mixing valve is a definite possibility IMO.
< snip >

Well, Peter, in an uncharacteristic burst of initiative and energy, I went ahead and pulled the mattress out and lifted the plywood bed base and took the mixing valve out along with the check-valve (which is a separate part).

There was only the slightest amount of crud in there, but I brought both pieces in, put them in our electric teakettle and boiled both in white vinegar (don't tell Linda, I don't think she's completely forgiven me for cleaning SU carburetors in the kitchen sink back in the 60s).

Anyway, I put my shiny clean parts back together and tested it for operation (and leaks!). I'm proud to say there are no leaks and - and I really don't know why this is - there seemed to be an increase in flow when either faucet is turned to full hot. I don't think this is simply the "Hawthorne Effect" (you know, it just "got better" because I fiddled with it)... the flow is definitely higher.

So, that's my story, and I'm stickin' to it
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Old 05-23-2019, 07:31 PM   #6
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Good news!

Your "Manitas de Plata" did the trick, I guess?



Good to know that microscopic mineral deposits could have been part of the problem.

Peter
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Old 05-23-2019, 09:13 PM   #7
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My mixing valve stopped working completely this spring. After just 2 seasons and maybe 70-80 nights here is what had built up on the mixing valve screen....

I replaced the valve. Old one is a spare... just need to get around to soaking in vinegar....
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Old 05-24-2019, 10:16 AM   #8
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To complete the picture so to speak here is wulfraat's post/thread that i had saved. I'm planning on this project when i replace my BW vac breaker/ ck valve next mo. Thanks for the pics wulfraat!

http://www.airforums.com/forums/f445...-177432-2.html

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Old 05-24-2019, 03:50 PM   #9
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So where would I find this mixing valve?
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Old 05-24-2019, 03:55 PM   #10
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Quote:
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So where would I find this mixing valve?
On the back of the water heater.. Click on the link in post #8 above
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Old 05-24-2019, 04:05 PM   #11
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Note that not all water heaters have one.
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Old 05-24-2019, 04:33 PM   #12
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Mixing or pressure balance valve?

Guess my classic '72 doesn't have one. Is this pressure balance valve?
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Old 05-24-2019, 04:44 PM   #13
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It mixes very hot water from the water heater tank with cold water. In effect it gives about 9 gallons of hot water from a 6 gallon tank of scalding hot water.

We went tankless because DW needs her long hot showers on the road. The tankless puts out hot water as long as we have water and propane...and she’s happy with that!
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Old 05-25-2019, 08:06 AM   #14
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Debris in the WH mixing valve... what are the chances?

rmkrum - what tankless heater did you go with? Was it a drop in replacement for the Atwood or did you have to change the opening size in the outer skin? Did you self install?

All the Atwoods in late model airstreams have a mixing valve. On my last trailer I went 8 years no issues. The new one had to deal with clogging after just 2 seasons. Must be the Rocky Mountain water.....
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