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Drain cock dilema

Discussion in 'Plumbing and Central Heating' started by frank999, 4 Apr 2020.

  1. frank999

    frank999

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    Draining down a combi heating system.

    I can only find drain cocks that you connect a hose to, I am aware there are some with a Hozelock fitting.
    Either way - you need to have a hose pipe trailing across floors (and in this instance - down stairs) to a drain.

    Would it not be better to install a gate or ball valve - and fit a run of copper pipe to a drain.

    Only downside is if someone were to poke around, turn say a ball valve and accidentally drain the heating system.

    What is the diference between a Type A and Type B cock.

    Thanks
     
  2. denso13

    denso13

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    Type A has a gland on the spindle so doesn't leak like type B
     
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  4. Gasguru

    Gasguru

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    And how many customers do you think would pay for that?
    And what do you do when you've got several drops to rads?

    Type A have an o ring around the spindle and often an o ring behind the knurled ring (if not use PTFE). When you drain down the water doesn't p1ss around the threads and soak the floor.
    Type B are cheap and nasty with no seals.
     
  5. frank999

    frank999

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    And how many customers do you think would pay for that? point taken, guess it depends where the pipe has to run to.

    Type B are cheap and nasty with no seals. Thanks for the tip
     
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  7. endecotp

    endecotp

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    I have one of those; it’s a valve between the lowest point in the CH circuit and a bath overflow pipe, so you can drain the CH and it comes out just above ground level next to a path.

    BUT - I had lived here for five years before I discovered it. I had even fitted my own drain valve (with hose connection) by that point. I was getting a new carpet in the spare bedroom and decided to investigate a squeaky floorboard first. I lifted the carpet and underlay and there was a large black X painted on the floor where the squeak came from. I undid a few screws and there it was.
     
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