DIY Doctor

Ball valve in loft tank, valve or washer replacing?

Postby DagDave » Mon May 18, 2020 9:18 pm

HI, noticed that there is a little water coming from the downpipes near the edge of the roof, not a lot is coming out and it is only running out at some point during the night not at any point during the day or when any of the taps/toilet/shower are used. Had look at the tank in the loft, there is a slight trickle of water coming from out of the bottom of the valve roughly where the washer would be at a guess (pic attached of it) – the ball on the end of the valve arm seems fine, isn't cracked or filled with water itself so I'm guessing the washer or valve itself needs replacing?
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Postby stoneyboy » Tue May 19, 2020 9:25 pm

Hi dagdave
Probably not worth messing about fitting a new washer. Replace the valve by undoing the nut inside the tank and fitting a new one. The float can be reused.
Regards S
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Postby DagDave » Wed May 20, 2020 1:32 pm

Cheers S,

guess it just a case of getting a 2 part valve to replace it, with correct sized pipe, is there any favoured or unflavoured brands to go with? Noticed there's Flomasta and Peglar that seemed popular

https://www.screwfix.com/p/flomasta-bra ... alve/358fy

https://uk.rs-online.com/web/p/float-va ... lsrc=aw.ds
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Postby stoneyboy » Wed May 20, 2020 9:02 pm

Hi dagdave,
It doesn't really matter but I'd go for a part 1 type exactly the same as the existing.
Regards S
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Postby DagDave » Thu May 21, 2020 11:21 am

Will have a look at those – one last layman question, pipe that the valve goes onto looks like it's about 20-22mm (hard to get an exact measurement given the loft space!) so would I be looking for a 1/2 or 3/4 valve to fit on there?

Cheers

Dave
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Postby stoneyboy » Thu May 21, 2020 9:06 pm

Hi dagdave,
You don't need to touch the pipes outside the tank - grip the valve body and undo the valve body nut.
Regards S
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Postby DagDave » Tue Jun 02, 2020 6:49 pm

Replaced the valve (front half, not the entire unit!) with no real problems, except for lack of space in a very small loft! Thanks for the advice on this thread in here.
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