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Old 04-25-2019, 10:07 AM   #1
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Black tank valve leaking

After our last 2 drives we hook up the sewer hose as usual EXCEPT, lots of black water rushes out when the sewer cap is removed from the MH.
Is it unusual for this valve to leak? It doesn’t leak between empties when stationary. We check it before we pull the valve.
Has anyone experienced this? And fixed it?
Thank you for any help.
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Old 04-25-2019, 10:11 AM   #2
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Could something be bumping the valve open or does it move easy enough for it to vibrate open a little? Mine is still tight for the past 7 years. Tight enough, I had to replace the handle cause I stripped the threads in the handle.
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Old 04-25-2019, 10:17 AM   #3
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Quick fix

https://www.amazon.com/Valterra-T58-...gateway&sr=8-5

Permanent fix

https://www.amazon.com/s?k=valterra+...nb_sb_ss_i_2_6
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Old 04-25-2019, 10:24 AM   #4
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I have no cable operated valves, but I have read where it isn't uncommon for "stuff" to get caught in the valve. I have heard of wood chips, plastic from tank cut out, and even stuff that got flushed. I have dropped stuff in the commode that I had to retrieve... maybe someone dropped an item and didn't know or report the loss. Ink pens, bobby pins/hair clips, etc...

I got an inspection camera for my cell phone/tablet for like $20 on Amazon that would do a great inspection job. It is like 17' long and pretty COOL. I am now authorized to perform laparoscopic surgery.

If you do this... Empty tanks, flush pretty good and drain well before using your scope.
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Old 04-25-2019, 10:30 AM   #5
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How much comes out?

I had two SOBs (some other brand) that would hold a quart or so in the black pipe between the valve (mounted near the tank) and the dump port. (near the side of the R/V)

You could let the tank port open for an hour after dumping and nothing more would run out. Close the valve, cap the port, move the R/V and then remove the cap again and about a quart would come out. I wound up using a dump port mounted valve as referenced in a prior post on those two units.
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Old 04-25-2019, 11:27 AM   #6
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Replacing the valves is easy if they're exposed, once the tank is empty and clean.
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Old 04-25-2019, 11:50 AM   #7
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[QUOTE=emm-dee;2080377]Quick fix

https://www.amazon.com/Valterra-T58-...gateway&sr=8-5

We went to an RV store and bought this exact thing. They told us the seals could wear out or a piece of crud could be caught.
They also recommended a tank treatment which I never use, I do the Geo Method. They said the tank treatment helps the seals.
Thanks for everyone’s input. This forum is lifesaver.
I REALLY want a scope!
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Old 04-25-2019, 01:13 PM   #8
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Also colonoscopies!!!!!!!!!!!!!!!!!!!!!!
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Old 04-25-2019, 01:37 PM   #9
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We've had a twist on valve on our last 2 trailers and will always have one on.

It seems like there is a little stuff that over time migrates to the end of the pipe and when you open it it does as it's supposed to, pour out.

With the twist on you can plug everything in and then open the valve. Big thumbs up!
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Old 04-25-2019, 01:52 PM   #10
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Well, of course!

Quote:
Originally Posted by 5picker View Post
How much comes out?

I had two SOBs (some other brand) that would hold a quart or so in the black pipe between the valve (mounted near the tank) and the dump port. (near the side of the R/V)

You could let the tank port open for an hour after dumping and nothing more would run out. Close the valve, cap the port, move the R/V and then remove the cap again and about a quart would come out. I wound up using a dump port mounted valve as referenced in a prior post on those two units.
Well, of course! The outlet of the tank isn't on the bottom--there isn't enough ground clearance for that. It's on the side of the tank, maybe an inch up from the bottom. When you are level and drain the tank, that quart is still there on the bottom. Go around a few turns and it splashes up into the drain plumbing and runs downhill to the valve. You can't always find un-level ground at a dump station, in order to park with the valve-side low, although one of the dump sites at our regular campground is sloped this way.

I have the habit of connecting my drain hose at the far end first, then holding the near end under the outlet as I take off the cap which mitigates the problem without extra equipment.

Larry
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