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Kitchen mixer tap gravity hot water mains cold

Discussion in 'Plumbing and Central Heating' started by Fallout, 19 Oct 2015.

  1. Fallout

    Fallout

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    Is a check valve required on both feeds to a kitchen mixer tap if
    feed from gravity hot water and cold mains.
     
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  3. Fallout

    Fallout

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    Or just the hot?
     
  4. Fallout

    Fallout

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    I don't think the tap is dual flow
     
  5. Madrab

    Madrab

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    If you're following the water regs then you would have a single check on the cold mains.

    You may find you have hot water issues though if it's a single flow (mix in the body) tap if the hot n cold supplies aren't balanced.
     
  6. Fallout

    Fallout

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    Would one not be needed on the hot to stop the mains over powering the hot and going up the hot pipework?
     
  7. ScottishGasMan

    ScottishGasMan

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    Its two seperate handles so no need for a check valve on either.
     
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  9. Fallout

    Fallout

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    Thanks, why does it having two handles mean it doesnt need a check valve either side? if you just put one on the cold could the mains not back fill the hot water?
     
  10. bernardgreen

    bernardgreen

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    If it is a tap used for drinking water ( including water used for cooking ) then it MUST not mix hot and cold in the body of the tap. There must be two channels through the spout so that hot and cold cannot mix together until falling under gravity clear of the tap.
     
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  11. Madrab

    Madrab

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    Regardless of whether you have check valves or not, if the cold pressure is much higher than the hot, it will restrict the hot flow if it is a single flow mixer tap, it may not flow up the hot pipe with a check valve but it can stop it flowing into the tap body so it makes no difference, a check valve will also restrict gravity hot water.

    As bernard mentions though, if this the only mains cold fed tap in the property, it needs to be dual flow or 2 separate taps to ensure no contamination of the drinking water from the hot.
     
  12. Fallout

    Fallout

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    Thanks thats the tap in the picture, the spout is just one channel so pretty sure it mixes in the tap body, any one come across this tap before? Was meant to be for a kitchen sink
     
  13. Fallout

    Fallout

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    Is it not suitable for a kitchen sink then, think its designed for a kitchen sink
     
  14. Madrab

    Madrab

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    It's not that it's not suitable for the kitchen sink, it's just that ideally you would have at least one tap in the house that supplies mains cold water that can't be mixed with the gravity hot water, to supply the drinking water. That's usually the kitchen sink in a gravity fed system.
     
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