A very peculiar shaped ballvalve in the loft water tank

Cistern means a toilet fed from a water tank in the roof.

Shame you took all the pipe work apart and the old ball valve out. All you needed to do was take the split pin out, unscrew the end of the ball valve, take the piston out, unscrew the end of the piston, replace the washer and put it back together.
Told him that in an earlier thread!

The old pipes were not totally destroyed. It was just detached from the mains water pipe in order to take out the old ballcock. It can be put back with a compression fitting to the tank and mains pipe any time, and in fact they are now back into the mains pipe working as before.

I looked closely into the old ballcock. There were lots of dirt and grimes in it. I cleaned it up. And put it back to the water tank and the old pipes.
It still leaks the water when the float was raised by the water level. It seems the washer or jet inside of the ballcock is definitely needing replacement.

The plumbers washer kit has arrived from Amazon, but there was nothing which looks like will fit and do the job for the old ballcock.

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Where do they stock the parts? I am going to try getting the new parts and try them with the old ballcock, before the new ballcock arrives (seems will take a few days for arrival). The old ballcock can be now easily taken out and put back again due to the 50+ years of lock frozen bolt and nut are now freed and easy to turn for tightening and loosening.

If the old ballcock works ok with the new parts, it will be left to do the work, returning the new ballcock for refund. If it doesn't, then new one will be fitted. This is the plan.
 
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Follow the instructions in this video. Even though its filmed in new zealand ball valve, its the same design.


The washer will not have a hole in it. It’ll be a round rubber disc in the end of the piston.
 
Follow the instructions in this video. Even though its filmed in new zealand ball valve, its the same design.


The washer will not have a hole in it. It’ll be a round rubber disc in the end of the piston.

Thanks for info. Now the problem is actually finding the holeless washer for the size, and possibly the stainless seat for the ballcock.
Seems difficult to locate the seller stocking the parts.
 
I'm not a plumber but I'd agree with HERTS P&D that you should be fitting a Part 2 valve.
If you do find a suitable solid washer for the old valve then I'd expect it to be a loose fitting but not so loose that it falls out.
 
Now the problem is actually finding the holeless washer for the size, and possibly the stainless seat for the ballcock.
Seems difficult to locate the seller stocking the parts.

What do you find if you search the ‘net for “ballvalve washer”? I get plenty of promising-looking options, including toolstation, b&q, bes, etc.
 
I'm not a plumber but I'd agree with HERTS P&D that you should be fitting a Part 2 valve.
If you do find a suitable solid washer for the old valve then I'd expect it to be a loose fitting but not so loose that it falls out.

What do you mean by a loose fitting but not so loose that it falls out?
Do you mean the size of the new washer will be too loose for old valve, and it will fall out?

Yes, it made me to wonder which washer will fit rightly into the old valve, if I bought one.
PART2 valve is on its way to me in case the old valve is not possible to put to use.
 

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