Black water tank/sticky valve

[Bogey32]

I have a sticky valve in the black water tank Any suggestions on how to correct other than replacing
I have been air streaming for some time but it seems there is always something going wrong. Am I alone or is this just part of RV'ing
Ben

[kennethowens]

Pull it out...take it apart....clean it.
Buff the contact surfaces with 600-800 grit
sandpaper for smooth slide action. Check
for burrs along the slide path. Your 1989
is 20 years old. It does seem that repairs
are part of the deal.

[jcanavera]

Thetford makes a lube that you might want to try.

Thetford RV Toilet Chemicals - Bowl Cleaner, drain valve lubricant, digester

No promises but I used this on my Hi-Lo that I kept for 14 years. It never got the valve to 100% but it did ease up the operation. Some holding tank chemicals also contain a lube so you might look at that also for future use.

Jack

[Bogey32]

Thanks to everyone. I will keep working with the suggestions until I find a solution.

Thanks again
Ben