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CWS float valve: part1/2 compatibility

Discussion in 'Plumbing and Central Heating' started by phloaw, 23 May 2020.

  1. phloaw

    phloaw

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    Tonight the arm of the ballcock feeding the cold water storage cistern in my attic broke (quite puzzling: maybe due to strong wind causing some turbulence??).

    Anyway, I need to replace it. I know it's faster to replace only the part inside the tank, undoing the very last compression nut.

    But can I do that when passing from a "part 1" to a "part 2" valve?

    Otherwise, I might choose to stick with part 1 to cut the hassle.

    PS: I'm talking about an open vented pumped S-plan system, common here in UK, aka "hydronic heating system" in USA.
     
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  3. denso13

    denso13

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    Either just replace the internal parts of the part 1 or replace the whole thing with a part 2. It shouldn't be difficult to swap the whole thing.

    This is a UK site.
     
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  4. phloaw

    phloaw

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    Ok, thanks, I'm deciding now what to buy.
    Partially related: do you know why the valves I'm looking to buy all specify "Side Entry" in their description?
    Should I care about that when choosing? :)
    I googled to no avail.

    I know, but now I have the habit of attaching this clarification just in case, after getting some bewildered questions on other forums. Should remember not to do that when in UK :)
     
  5. denso13

    denso13

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    Side entry is common for storage cisterns, bottom entry is more for wc cisterns, with the cistern entry at the bottom.
     
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  6. Chris_W

    Chris_W

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    If you stick with part 1, you risk backflow, as they’re only permitted now with adequate backflow prevention measures. (All to do with water regulations). Part 2 and 3 are fine.
     
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  7. phloaw

    phloaw

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    Thanks for your useful replies. Still choosing what to buy: now the choice is between plastic seat and brass seat (more expensive).
    I am again clueless, as couldn't find much on google about why that matters.
    Any idea?
     
  8. Chris_W

    Chris_W

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  9. Nige F

    Nige F

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    Plastic is fine .
     
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  11. phloaw

    phloaw

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  12. Chris_W

    Chris_W

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  13. phloaw

    phloaw

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  14. denso13

    denso13

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  15. phloaw

    phloaw

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    So I ordered a part 2 to replace my broken part 1, but now I have a silly question: can I keep the old rubber ball? Or do I need to buy a new one?
     
  16. Chris_W

    Chris_W

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    If it’s rubber it may fail, if it’s plastic, clean it and reuse, providing it’s not damaged.
     
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  17. phloaw

    phloaw

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    It's plastic, sorry, and it looks ok. My question was more about the compatibility: i.e., will it fit on the new valve?

    (sorry, the valve hasn't arrived yet, so I cannot try myself; just thought to save some time and ask)
     
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