jfaulkner Posted June 20, 2016 Report Share Posted June 20, 2016 My black tank valve is not closing all the way. Hangs up with about an inch to go. Obviously, something is keeping the blade from inserting all the way into the seal and the liquid leaks out. We keep pouring water down the toilet trying to keep the solids moist. The valve is a Thetford valve that is hard wired and requires completed disassemble to change the seal. Plus, the valve is enclosed and I have to disassemble the enclosure to access the valve. I am in Yuma, AZ where it hit 119 today and won't be below 113 for the foreseeable future. I won't be trying to fix the valve until we reach cooler weather which won't be for another week. Until I can fix the valve, is it better to keep the valve open and use a lot of water to flush, and also keep the grey tank closed and, when full, using it to back flush the black tank to keep the solids from accumulating? Jer International 4700LP (2000) Travel Supreme (36RLTSOA) Fulltimer Link to comment Share on other sites More sharing options...
I'mdonewiththis forum Posted June 20, 2016 Report Share Posted June 20, 2016 I don't know if you could use enough water to flush the tank when you flush the toilet. If it was possible I would not use the tank for a day then try using a hose (even if I had to go buy a new one) and see if I could push the hose up the discharge. It WILL and I can't emphasize it enough, it WILL be messy........ Maybe you could put a five gallon pail under the discharge if you try to back flush it? Link to comment Share on other sites More sharing options...
Ray,IN Posted June 20, 2016 Report Share Posted June 20, 2016 When the black tank dump valve failed to fully close, I bought a (sold at most RV supply stores) Valterra twist-on valve , attached it to the main outlet and left it closed. The drawback is you must remember your grey tank is also closed. This means you empty both tanks when your grey tank gets full. I did this by first emptying the black tank and leaving that OEM valve open, closing the twist-on valve, then opening the OEM grey tank valve to backflush the black tank then opening the twist-on valve to dump that. Only after that did I completely empty the grey tank. Had the OEM valve replaced when we got home. I hope my explanation makes sense, and is of use. 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
jfaulkner Posted June 20, 2016 Author Report Share Posted June 20, 2016 I should have mentioned that I do have the Valterra valve installed. Jer International 4700LP (2000) Travel Supreme (36RLTSOA) Fulltimer Link to comment Share on other sites More sharing options...
Ray,IN Posted June 20, 2016 Report Share Posted June 20, 2016 Then you're OK until you get where you can replace the OEM valve. You'll just have more steps to go through until then, just remember to keep the twist-on valve closed until the grey tank is full and the black tank fill with water to keep solids covered. 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Devilishjim Posted June 20, 2016 Report Share Posted June 20, 2016 When the black tank dump valve failed to fully close, I bought a (sold at most RV supply stores) Valterra twist-on valve , attached it to the main outlet and left it closed. The drawback is you must remember your grey tank is also closed. This means you empty both tanks when your grey tank gets full. I did this by first emptying the black tank and leaving that OEM valve open, closing the twist-on valve, then opening the OEM grey tank valve to backflush the black tank then opening the twist-on valve to dump that. Only after that did I completely empty the grey tank. Had the OEM valve replaced when we got home. I hope my explanation makes sense, and is of use. After you do this open the one that is stuck and hopefully with a full tank flush it will wash out the plug problem Jim Spence 2000 Dodge 3500 1 ton QC 4x4 dually 5.9 diesel LB BD exhaust brake, 6 spd manual trans 34CKTS Cedar Creek 5er, Trail-Air hitch Link to comment Share on other sites More sharing options...
tpipkins Posted June 20, 2016 Report Share Posted June 20, 2016 Before you disassemble things, get one of these and attach to drain pipe, then use garden hose to shoot water upstream into drain pipe. No guarantees, but it may solve the problem. '98 Volvo, '03 Newmar Mountain Aire 5er,'07 Polaris RangerPart timing all the time Link to comment Share on other sites More sharing options...
jc2 Posted June 20, 2016 Report Share Posted June 20, 2016 Do you have one of the built-in tank spray cleaners that you would hook a plain garden hose to? My black tank valve is not closing all the way. Hangs up with about an inch to go. Obviously, something is keeping the blade from inserting all the way into the seal and the liquid leaks out. We keep pouring water down the toilet trying to keep the solids moist. The valve is a Thetford valve that is hard wired and requires completed disassemble to change the seal. Plus, the valve is enclosed and I have to disassemble the enclosure to access the valve. I am in Yuma, AZ where it hit 119 today and won't be below 113 for the foreseeable future. I won't be trying to fix the valve until we reach cooler weather which won't be for another week. Until I can fix the valve, is it better to keep the valve open and use a lot of water to flush, and also keep the grey tank closed and, when full, using it to back flush the black tank to keep the solids from accumulating? Jer 2010 Newmar Dutch Aire 4304-Spartan Chassis-Cummins ISL 425hp-2013 Chevrolet Equinox AWD Towed-SKP# 120487-FMCA #402879- Link to comment Share on other sites More sharing options...
jfaulkner Posted June 20, 2016 Author Report Share Posted June 20, 2016 Thanks all. Good advice and suggestions. I have replaced the seals in this valve a couple of times over the last 16 years that we have been fulltiming. Hopefully this will be the last time. Really a PITA because of the valves Travel Supreme used and the way they installed them. Jer International 4700LP (2000) Travel Supreme (36RLTSOA) Fulltimer Link to comment Share on other sites More sharing options...
hydehunter1 Posted June 22, 2016 Report Share Posted June 22, 2016 I use 2 of those valves, one for gray and one for black works great Link to comment Share on other sites More sharing options...
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