While giving the Black tank a good cleaning. Ughhhh - Dutchmen Owners

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Old 05-28-2019, 06:31 PM   #1
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While giving the Black tank a good cleaning. Ughhhh

I figured I would do a little investigating. Our gray water tank is 39 gallons. When camping that tank fills up in less than 2 days, backing up in the kitchen sink. I look at wife..........she ignores me haha.



I took a five gallon bucket and filled the tank to 42.5 gallons thru the kitchen sink. No back up and good flow down the drain. another 2.5 gallons and it backs up.



But the tub and outdoor sink do not backup. I know the outdoor sink has some kind of weird trap that sits totally horizontal. Is that why they don't overfill before the kitchen sink?? Can anyone explain what is happening here??Just curious now. May need to know in the future.


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Old 05-28-2019, 09:25 PM   #2
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Without knowing the exact plumbing scheme of these things one could surmise there may be a check valve in the drains other than the kitchen sink.
The check valve would keep the sink water from filling the tub and exterior sink.
Of course this is a SWAG on my part.
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Old 05-29-2019, 02:50 AM   #3
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You both are correct. Horizontal check valves are being used in place of p-traps more often. I have 3 in my Tiffin.
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Old 05-29-2019, 04:28 AM   #4
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Thanks for the info guys.



I did not realize that was an actual "check valve" Makes sense.


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Old 05-29-2019, 01:02 PM   #5
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Thanks for the info guys.



I did not realize that was an actual "check valve" Makes sense.


Have fun!

Some call them horizontal check valves or foot valves or cow tongues. They don't necessarily have to be positioned horizontal however.
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Old 06-05-2019, 05:59 PM   #6
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Some call them horizontal check valves or foot valves or cow tongues. They don't necessarily have to be positioned horizontal however.



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Old 06-05-2019, 10:13 PM   #7
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The kitchen drains to the black tank?
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Old 06-06-2019, 12:32 AM   #8
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We have 2 grey water tanks. One to the rear is kitchen only. Front has grey and black. And what to my surprise, the manual says “in some models the grey water tank when full overflows to the black water tanks”. Apparently this is a one way deal and I find it helps when we are washing clothes and showering. Has not caused problems. When black fills up, the toilet “burps” when it is flushed. I know then to drain. The kitchen I leave open every other black drain. If left open to long, the low drain rate allows crud to build up in hose. 2016 Voltage 3970 TH
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Old 06-07-2019, 07:36 PM   #9
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Hepvo valve is the term you are looking for. Click image for larger version

Name:	Screenshot_20190607-143456_Chrome.jpg
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ID:	5481
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Old 06-08-2019, 01:18 PM   #10
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Hepvo valve is the term you are looking for. Attachment 5481
pretty interesting device. Going to look under my sink to see if it can be added to get a little extra room. Would probably not need to be winterized because the P trap is gone.




BUT, If she drops a ring it's gone!
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Old 06-08-2019, 02:15 PM   #11
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BUT, If she drops a ring it's gone!

If she drops a ring YOU'RE gone!
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Old 06-08-2019, 02:16 PM   #12
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BUT, If she drops a ring it's gone!

If she drops a ring YOU'RE gone!
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