Cistern valves won't turn off

[omits]

I have two 100 gal tanks in loft with valves both outlets. I can't seem to turn off the cold feed to the bath. It runs on slower but persists. Can I fix this without draining the tanks and changing the valves. I'm in a VERY scaly area.

Also, the valves by the hot tank are stuck solid (one is the cold feed obviously not sure what the other is). How do I free them w/o draining the lot?

Thanks.

 

[DiyNutJob]

This worked for me:

 

[Harry Bloomfield]

This worked for me:

And once it is free and working - open the tap fully, then re-close it just half a turn, before leaving it. It might make it easier for next time.

 

[Madrab]

Wow, must be some size to be using two 100Gal cisterns, are they tandem? IME once these valves lock up then the spindle snaps or the valve never shuts off properly again, defeating the purpose.

Bung the Cistern outlets, that will allow the (Gate?) valves to be removed and replaced using full bore lever valves. Need to measure the pipe size or see if the valves are size stamped (how old?) and clean removal of the old olives.

 

[omits]

Wow, must be some size to be using two 100Gal cisterns, are they tandem? IME once these valves lock up then the spindle snaps or the valve never shuts off properly again, defeating the purpose.

Bung the Cistern outlets, that will allow the (Gate?) valves to be removed and replaced using full bore lever valves. Need to measure the pipe size or see if the valves are size stamped (how old?) and clean removal of the old olives.

Bit of a worry if the bung pops out or just leaks while doing that! Where do I get bungs from and what size? Thanks.

 

[HERTS P&D]

Drain it all down and fit new full bore lever valves where needed.

Andy

 

[Madrab]

Bit of a worry if the bung pops out or just leaks while doing that! Where do I get bungs from and what size

Rarely happens due to the weight of water acting upon the bung but as suggested if you're worried then drain them down.

You can use stepped/variable size bungs but it really does depend on the size of the outlets