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Old 07-02-2014, 10:07 AM   #1
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Is it common to have two valves on the black tank?

Friend just purchased a 2011 Thor Serrano and on his maiden voyage his black tank wouldn't dump. He called me for suggestions and I told him everything I knew to no avail. He went to Camping World and tried everything the suggested and sold without success. He was to the point of taking it somewhere to have the dump line snaked when a service tech pulled up to a nearby site for another repair. The service tech came over and crawled under the coach and discovered a second valve at the black tank where the line exits the tank. The tank is on the passenger side and the dump is on the drivers side. This is new to me. The tech speculated that it was to keep solids from sitting in the approximately 6 ft of line that crossed to the other side of the coach. This valve can be accessed from the propane compartment but isn't exactly conspicuous. Thoughts?
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Old 07-02-2014, 10:19 AM   #2
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That's a reasonable thought, I would think that it's so that the few gallons of water and chemical we put in after dumping would stay in the tank instead of in the pipe.

But I can't fathom why they wouldn't just have one valve at the tank. Surely a longer release cable is cheaper than another cable and valve assembly.

Who knows.
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Old 07-02-2014, 10:27 AM   #3
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I would guess that it's to keep the line empty 6 feet of 3 inch pipe is a lot of weight bouncing and could cause the tank to crack open where the pipe attaches to the tank
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Old 07-02-2014, 11:36 AM   #4
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How common it is I do not know but I have seen it many times.

Plus a lot of RV's have 3-valve systems..
Black-Valve-\
. . . . . . . . . .-----Common valve
Gray-Valve -/

I leave it up to others to explain why.
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Old 07-02-2014, 02:50 PM   #5
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Our 2013 Coachmen Freelander has two blade valves on the black line. Black tank is on the passenger side. As others have mentioned I expect it is to keep the cross drain clear.


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Old 07-02-2014, 06:11 PM   #6
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Most RV black/gray water systems are linked together by a common manifold that terminates with a gate valve where the sewer hose hooks up. So most black/gray tanks are isolated with there respective valves so there's no way the two can intermix if both tank valves are closed. IMO, the manifold valve is a 'safety' backup valve in case of a slinky rupture or a tank valve failure to stop the flow...I call this valve the "cockroach blocker' and that sucker stays closed at all times when not dumping.

We have 4 tanks, two 40 gal. gray and two 40 gal. black w/valves, all tied to a common manifold with it's own valve and pull 'T' handle.
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Old 07-09-2014, 03:56 PM   #7
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Our Serrano had the exact same arrangement and I actually came to appreciate it. If there was only the one valve on the drain side, I believe the pipe would have become an issue - clogs or smell or even cracking. It worked fine and I had the assurance that nothing would accidentally get dumped due to a valve open. One extra step, but no biggie.
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Old 07-09-2014, 04:57 PM   #8
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I got caught out the first time I went to dump the black tank on our old motorhome, which indeed had the tank on the right side. Makes sense in those situations, I think.
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Old 07-11-2014, 04:28 PM   #9
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Must have been standard as our Serrano had the 2 black water valves as well.

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Old 10-14-2014, 11:34 AM   #10
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Newbie RVr question

This is the rig we just bought used and were told about the two valves during the walk around. I had so much information thrown at me, it was a bit overwhelming. My question is what order would you experienced folks say is the right order to open them when dumping? My guess is the end one on the driver/wet bay side first since air pressure inside the six foot hose might prevent any movement of the tank contents until the other valve was opened. But then maybe that preferred so it empties with more force? Enlighten please! Thanks
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Old 10-14-2014, 12:00 PM   #11
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My 2011 Coachmen Freelander has this type of setup. A valve at the Black tank on the passenger side and one on the drain pipe before the grey valve on the driver side. Mine are easily accessible from underneath.

I open the drivers side first then the Black tank valve on the passenger side.
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Old 10-14-2014, 12:21 PM   #12
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Quote:
Originally Posted by MikeDavidson View Post
This is the rig we just bought used and were told about the two valves during the walk around. I had so much information thrown at me, it was a bit overwhelming. My question is what order would you experienced folks say is the right order to open them when dumping? My guess is the end one on the driver/wet bay side first since air pressure inside the six foot hose might prevent any movement of the tank contents until the other valve was opened. But then maybe that preferred so it empties with more force? Enlighten please! Thanks
Mike. Your guess on the valve operation is correct, as other posters have noted, the main purpose of the dual valve set up is to keep the pipe, between the valves, empty to prevent freeze up, OR , any major spillage should the pcv.pipe be damaged on the road.
Note: I have seen this happen, at a RRxing, all under slung sewer lines, from a TT, laying at the side of the road.
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Old 10-14-2014, 12:59 PM   #13
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Thanks Skip and Ray! Appreciate the confirmation! Makes total sense. Now to go dump for the first time! Hopefully, I don't channel Robin Williams!
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