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Combi fitted, need new valves?

Discussion in 'Plumbing and Central Heating' started by JOB6, 18 Apr 2017.

  1. JOB6

    JOB6

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    A verified plumber said that I need a ball valve installed to replace the gate valve as a new heating system was installed and there are no non return valves on any of the hot water pipes, he said to prevent cross contamination they should be installed does this seem right?
     
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  3. Aquaheat

    Aquaheat

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    From info given then No but you need to be more specific as to what was said and your system.

    Sorry I can't be of more help but the crystal ball is on for a service and polish today.

    Jon
     
  4. Dan Robinson

    Dan Robinson

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    OP has mis heard/typed the situation.

    I'm guessing the installer said new ball valve in the bogs due to high pressure after a combi conversion. Then - Non return valves on the mixers to stop cross flow and therefore poor hot water performance.

    Just a guess - and if I'm right then the installer is saying the right things. Mixers depending.
     
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  5. JOB6

    JOB6

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    Thanks Dan and sorry I didn't exactly make much sense. The plumbing is old (1960s) and recently a new electric combi boiler was installed, the water is gravity fed and comes via a central plant system. The flat has high water pressure and I live on the second floor and am lucky enough to have good water pressure throughout it.
    A plumber came to look at the pipework and said that the gate valve wasn't much good for the new system and a ball valve would function better. He also noticed that no valves such as non return valves to prevent cross contamination were installed and they really should be.
     
    Last edited: 18 Apr 2017
  6. Dan Robinson

    Dan Robinson

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    Sounds like he's on the ball to me.
     
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  7. Dan Robinson

    Dan Robinson

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    Christ my crystal ball is firing on all cylinders this afternoon. :LOL:
     
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  8. AGAS

    AGAS

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    Sounds like the plumber knows what he's talking about, not all plumbers are looking for work ;)(y)
     
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  9. Agile

    Agile

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    Do you know what this gate valve actually does?

    Their design is not very ideal but they are cheaper than the ball valves which give better performance and are more reliable.

    Seems odd to me that a new boiler was fitted without addressing all of the issues which needed attention at the same time.

    Makes me think that it may well be an attempt to get more income. To make a specific visit to change a valve, draining whatever is involved, supplying a new ball valve etc. would usually be well over £100.

    To have done it while fitting a new boiler is likely to have been a very minor job, all depending on what the valve actually does!
     
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  11. Agile

    Agile

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    Non return valves on hot water feeds to mixer taps and showers should really always be fitted but rarely are! Not having them can cause problems when the seals in what they are supplying become old and start leaking.

    Tony
     
  12. Dan Robinson

    Dan Robinson

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  13. ianmcd

    ianmcd

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  14. Agile

    Agile

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    Because if the mixer valve seals leak it allows a cross flow from cold to the hot port and that affects hot water delivery at all hot taps.

    I thought everyone knew that.
     
  15. Dan Robinson

    Dan Robinson

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    Or perhaps we realise that some mixers have them built in, and some don't mix until the outlet.

    Perhaps too gate valves can be more expensive than lever ball valves.
     
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  16. Steelmasons

    Steelmasons

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    On balanced supplies?
     
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