Cold water tank feed into central heating

altocumulus

I have a cold water tank feeding into the central heating boiler. The valve into the tank is dripping, despite the ball being in a position which should totally close the valve.

I have dismantled all three-times, with no difference. I have checked and there is nothing in the nozzle to prevent the valve closing (as I once discovered with the main water tank; -that was a sliver of wood!)

The plastic valve itself has a removable black bung where one end is flat and the other shaped where it pushes against the water inlet. Can this bung be reversed or does it need to be a new one?

thanks in antic ...

ormus

fit a new valve seal or replace the valve completely. they are very cheap.

altocumulus

just a quick question, can I turn the valve seal around ? or is the inlet side moulded specifically ?
(just asking 'cause it's a 20 mile trip to the nearest shop).

EliteHeat

altocumulus wrote: »

just asking 'cause it's a 20 mile trip to the nearest shop.

Where do you live? up a mountain?

altocumulus

Not up a mountain, no, but a distance from the nearest plumber's merchant or diy store.
- in answer to my own question, I can turn the seal around, but it still drips -
so it's a new seal or a new valve assembly....in the meantime the outside overflow will just have to keep well, erm, dripping .....

david29dpo

I have found hair line cracks are common where the rubber seal fits. Replace the lot.

Canucklehead

Hi

You have a diaphram ball valve washer . It is intended to fit one way round, although the difference is not very obvious to see at first glance.
If you can isolate the tank supply then do so for a day or two and see if the oveflow stops.Bail out some water first. If not you might have a pinhole in the hot water cylinder coil.(as long as you have one!) The main cold tank water level has to be higher than the heating f&e tank as well.
Sometimes the plastic oriface (the washer sits against) develop splits and will let by.

Corgi Guy.

altocumulus

mmm
some of these descriptions don't tally with the system we have.

This feeder tank is just that, an inlet/with ball/!!!! valve (which is dripping), an overflow pipe and the feeder pipe into the central heating.

The valve seal on the inlet valve has a moulded side and a flat side, with no obvious signs of wear, but it is certainly old enough to be suspect.


Thanks all for your kind comments; I shall take a trip out some day this week and decide on a new valve or just the seal....