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CH drain valve won't shut

Discussion in 'Plumbing and Central Heating' started by phloaw, 18 May 2020.

  1. phloaw

    phloaw

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    Today I drained my CH/HW. This is a standard vented, pumped S plan with two electric valves, and I'm in UK.

    I was lucky enough to have a drain valve underneath ground floor, relatively accessible, see pics:

    [​IMG]



    [​IMG]

    However, upon refilling the system, I found out that that valve will rotate endlessly, and won't guarantee proper isolation: it's stripped.



    I was thinking to add an isolating (aka service) valve past the old one, i.e., along the pipe in the bottom part of the images.

    Something like this:

    [​IMG]



    Do you think that will work? Or is there a risk that the old valve will leak when the new one is shut? Do you foresee any other possible problem?

    Any feedback welcome!

    Thanks!
     
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  3. sircerebus666

    sircerebus666

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    You would be much better off fitting a drain cock , that way you can attach a hose pipe to it next time you need to drain down your system

    Or that isolation valve then a drain cock , that way you can be doubly sure it won't leak
     
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  4. phloaw

    phloaw

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    The problem is I have no idea where the pipe past the broken valve ends. It goes somewhere to the bottom part of second picture, which I cannot see.

    I drained the system hoping it ends in the waste piping, but now you are making me wonder.
     
  5. sircerebus666

    sircerebus666

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    Ah ok missed that , then just that isolation valve will be fine, you may get away with removing the old one and putting the isolation valve in its place
     
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  6. phloaw

    phloaw

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    Thanks, since the old valve is in an awkward position, I just left it and placed the new service valve past it, hope that will be fine.
    But now I have bigger problems: upon refilling, no radiator will bleed, the system looks empty.
    I suspect a blocked feed, expect a separate post! :)
     
  7. Hugh Jaleak

    Hugh Jaleak

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    Whilst system is empty, ditch the service valve and fit a full bore lever valve, chances are that service valve will leak next time you try and use it, and that's if you can shift it again. https://www.screwfix.com/p/lever-ball-valve-red-15mm/67744 The existing valve looks rather like a gas cock, which will be 1/4 turn on to off anyway. Not sure its entirely suitable for use with water.

    As for cold feed, try a magnet on the pipework, if it attracts, that's where your blockage is. Only solution to that, cut pipework out and replace. Ideally clean the system then before adding inhibitor.
     
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