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Gate Valve to balance HW primary flow?

Discussion in 'Plumbing and Central Heating' started by slippyr4, 11 Sep 2005.

  1. slippyr4

    slippyr4

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    Hi chaps,

    I'm in the latter stages of installing my DIY "Y plan" CH/HW system (although i'm not doing the new boiler myself (i don't have a death wish)).

    I've been installing an entirely conventional design. But yesterday I was in wickes (I apologise for that) and looked through their How-to leaflet on installing CH systems.

    Their diagram included a gate valve on the return from the HW heat exchanger, apparently to "balance" the flow when the mid-position valve is in the mid position. I've never come across this. Is it necessary? A good idea? A waste of a gate valve?

    I'm worried i've missed a bit out!

    thanks

    slip
     
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  3. kevplumb

    kevplumb

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    the idea is to slow the flow through the h/w coil which is 22mm as opposed to starving the rads ;)
     
  4. chrishutt

    chrishutt

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    Not essential, but without balancing the bulk of the hot water flow will go to the hot water side when valve is in mid position. This is not a real problem if cylinder is high recovery and can heat up quickly, so minimising time in mid position. But a gate valve costs next to nothing (£2?) and is easy to fit, so why not give yourself the option of making adjustments if necessary?
     
  5. slippyr4

    slippyr4

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    Ok, i will fit one. Should it be before or after the cylinder? or doesn't it matter? after would be easier, with my pipe layout.
     
  6. chrishutt

    chrishutt

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    After is fine. If before, make sure you don't obstruct vent pipe route from boiler to expansion tank (if open system).
     
  7. slippyr4

    slippyr4

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    no, its a closed system (will be getting a system boiler). that's why i want to fit it after- the HW side of the mid pos valve goes to a automatic vent then to the cylinder, and not really room for a gate valve.

    after it is. thanks all.
     
  8. kevplumb

    kevplumb

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    closed systemi
    ie pressurised fit it on the flow then
     
  9. chrishutt

    chrishutt

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    Why :?:
     
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  11. kevplumb

    kevplumb

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    :rolleyes:
     
  12. chrishutt

    chrishutt

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    But that's the flow pipe, isn't it? He wants to fit on return because there isn't room on flow.
     
  13. kevplumb

    kevplumb

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    so put it on the return
    whats the odds
    its only slowing the flow down :rolleyes:
     
  14. slippyr4

    slippyr4

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    Thanks chaps. all done now:-

    [​IMG][/img]
     
  15. chrishutt

    chrishutt

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    It's a brave man who posts a pic of his handiwork on this site... :rolleyes:
     
  16. slippyr4

    slippyr4

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    I know. Suprised i haven't got flamed yet. it's been online for a couple of hours already.

    Whilst it may not be perfect, it's a lot better than many examples i've seen that some "plumbers" have installed.
     
  17. chrishutt

    chrishutt

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    It's been posted 13 hours now and not a titter :!: Maybe it's a perfect installation? OK, it obviously needs insulation on the pipework, but since it's "work-in-progress" that doesn't count. Looks like you got away with it...
     
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