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foy

Hi guys.

I was tasked with fitting a new fill-valve to a customer's cistern, whilst I was decorating the place.

That part went fine (no leaks from cistern) but I cannot now get a good seal on the joint from the shank of the fill-valve to the old pipework.

There was no leak there before I started but I think am going to have to change component(s) as I think the old set-up was incorrect....

  • shank has 1/2 BSP (male) thread
  • existing elbow has 1/2 BSP nut at top and unknown-size compression fitting at other end. It's an old property so could be Imperial. Could be metric if changes have been made over the years
  • position of compression-end of elbow varies (in relation to horizontal pipe) depending on how far up or down the shank it is rotated
  • shank of new fill-valve slightly shorter than old one so when elbow tightened onto shank it doesn't point in same direction
  • wouldn't have this problem if bent tap-connector was used as it can stay in same position as nut is tightened onto shank
  • bent tap-connectors available nowadays have 1/2 BSP nut and metric compression end (15mm pipe). assume thread on that end is metric
  • cap-nut on existing pipe may have Imperial thread and not fit 'modern' connector
  • if so olive will need to be removed to use cap-nut from new part
  • pipe could be deformed by old olive
  • then will need to fit new pipe
So I guess my question is are the threads on Imperial compression fittings compatible with the threads on modern ones?

http://i.*********/aNiEFSh.jpg
elbow needs to point in right direction to meet pipe

http://i.*********/t4F3fae.jpg
if elbow wound right up shank of new fill-valve it points wrong way

http://i.*********/uzkPCVG.jpg
old fill-valve shank was a little longer and elbow sat just right with it

http://i.*********/cul4Mmj.jpg
had to put packing piece put in elbow to achieve same result

http://i.*********/8nZMRjp.jpg
still getting a little weep from top on elbow which settles here. no leak from compression joint
 
Cheers Paulplumb.


That looks pretty good. Like the http://www.ebay.co.uk/itm/Yorkshire...147854?hash=item56877a9f8e:g:PHsAAOSwhQhY2TO~ I've been looking at but with shut- off facility.

Having said that reviewer 'thunders' wasn't happy with his :mad:

He writes

The male tube part is not long enough to be inserted in the corresponding female 1/2" pipe. The fibre washer is also too thick so that when it is screwed into the coresponding 1/2" it does not have enough thread that it can be screwed onto and therefore does not effect a watertitght seal. It would be better with a rubber o ring

Not sure exactly what he's saying but I think he means the non-compression end (ie the end with nut and fibre-washer) caused him problems. Washer too thick and not giving him much thread on the nut to purchase on whatever he was fitting it to.

I take it the one you posted link for would be 1/2 BSP nut with 15mm compression other end. Couldn't see spec in the listing
 
Fitted plenty myself without issue. All i can say in regards to thunders is some mothers do have 'em
 
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Angled tap connector, with a 15mm bof before it. Not a fan of service valves, especially the angled ones.
 
Cheers SimonG.

What's a bof btw?

I'll probably work it out just after hitting 'Post Reply' :rolleyes:
 
Hmm think it might be a predictive text typo. I think he might be an angled tap valve with a separate isolation valve valve before that.
 
That olive is too close to end of pipe to stop any water getting past.
Should be about 3/8" from the end and a bit of Waterhawk (potable one mind).
Fibre or poly washer under cistern.
Fill valve loose attach elbow then tighten fill valve.
 
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