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Old 05-17-2013, 09:38 AM   #1
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Dump Valve Maintenance


You're winding up a great weekend in your RV, and you pull up at the dump station to take care of the "necessary" duty of dumping your tanks. You dig out the sewer hose, take off the sewer cap, and out comes the liquids (and solids) that your dump valve failed to hold in the tank!

When this happens, don't jump to the conclusion that your dump valve has failed and needs to be replaced. More than likely, it is material that has become trapped in the groove where your dump valve seals.

The dump valve slides open and closes in a groove that has a rubber O-ring on each side of a nylon flat plate. What often happens is this: If you slide your valve closed while the tank is still emptying, toilet paper and solids can get worked into the groove--keeping the slide plate from making a proper seal.

Before you leap into an expensive dump valve replacement, try this easy procedure for cleaning the groove and O-rings. First, fill your holding tank completely with a mixture of water and dish soap (the dish soap acts as a lubricant for the rubber seals around the dump valve slide plate). As the water is emptying, repeatedly open and close your valve. This action works the solids loose and the running water washes them away. You may have to repeat this process a couple of times.
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Old 05-17-2013, 12:41 PM   #2
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Quote:
Originally Posted by Buddy
Dump Valve Maintenance


You're winding up a great weekend in your RV, and you pull up at the dump station to take care of the "necessary" duty of dumping your tanks. You dig out the sewer hose, take off the sewer cap, and out comes the liquids (and solids) that your dump valve failed to hold in the tank!

When this happens, don't jump to the conclusion that your dump valve has failed and needs to be replaced. More than likely, it is material that has become trapped in the groove where your dump valve seals.

The dump valve slides open and closes in a groove that has a rubber O-ring on each side of a nylon flat plate. What often happens is this: If you slide your valve closed while the tank is still emptying, toilet paper and solids can get worked into the groove--keeping the slide plate from making a proper seal.

Before you leap into an expensive dump valve replacement, try this easy procedure for cleaning the groove and O-rings. First, fill your holding tank completely with a mixture of water and dish soap (the dish soap acts as a lubricant for the rubber seals around the dump valve slide plate). As the water is emptying, repeatedly open and close your valve. This action works the solids loose and the running water washes them away. You may have to repeat this process a couple of times.

When I read this, I thought you were reporting my experiences!
I ended up purchasing another gate valve that fits on the end where the cap goes. After "dumping", I can close the external valve, put on the cap, and no more residual "fluid" dripping out when I hook up the next time.
By closing it, you can open the "gray" valves and it will equalize both gray tanks to maximize their size.

Thanks for the "soap mixture lubricant" tip!
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Old 05-17-2013, 04:00 PM   #3
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Are others having problems with the black tank valve? We've had ours replaced twice in the 6 months we've had our rl.
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Old 05-17-2013, 04:20 PM   #4
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Are others having problems with the black tank valve?* We've had ours replaced twice in the 6 months we've had our rl.*
just curious, does the cable seize or break, or is it something else?
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Old 05-17-2013, 04:35 PM   #5
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As my cables break, I'm going to be replacing them with the electric valves.
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Old 05-17-2013, 05:13 PM   #6
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We just had our cable break away at the handle mechanism. Had it replaced. While the tech was connecting the cable to the valve, the valve assembly fell off the black tank. The down angle of the black tank was too steep at about 10 degrees for the horizontal 3" PVC exit tube to connect. Apparently they weren't glued. Since the valve was already off, had the tech replace it as it as leaking and add a 6" rubber connecting tube to the valve.
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Old 05-17-2013, 09:16 PM   #7
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Are they More dependable?
(The electric ones).Edited by: subdoc4
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Old 05-18-2013, 11:25 AM   #8
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The first time, it was the valve itself -- just wouldn't close. The second time, the cable kinked
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Old 05-19-2013, 12:00 AM   #9
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I like the electric valve idea Dave. Our gray tank valves are starting to get tight. Are these a cable inside of a covering or are they inside of a small pipe? If the cables inside of a cable cover or case then I think I’m going to try some WD-40 and see if it will work its way to the end to see if that will free it up a little. I want to wait a few weeks on upgrading to the electric valves.
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Old 05-19-2013, 12:15 AM   #10
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The cable assembly is covered with a plastic housing covering a sprial metal housing and a wire to pull the valve. The cable is connected to the handle assembly with a compression fitting. No set screw. While you can spray lubricant onto the first three inches of the wire, there is no way to get it down the length of the wire.
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