odd gatevalve in airing cupboard

Discussion in 'Plumbing and Central Heating' started by ross94, 7 Jan 2016.

  1. ross94

    ross94

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    Hi all, I have a y plan gravity fed heating system, in the airing cupboard there is your normal setup, heating pump 3 port valve ect. However I have noticed this gate valve on the system and have always wondered what it is and what it does. I will describe it best I can without a picture, so here goes, Just after the pump in between the pump and the 3 port valve there is a T joint reduced to 15mm which goes to the gate valve in question then goes to the return pipe.

    This valve appears to be only half open, I have left it as it was before. just like to know what it is and what it does?. thanks
     
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  3. Nozzle

    Nozzle

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    So kind of bypass - if you have the three way valve set to heating only, and the rad stats are satisfied, there might be only one rad (the one with no TRV) with any flow through it. This will overheat your pump, being at or near dead head.

    Nozzle
     
  4. ross94

    ross94

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    I see so its like a bypass valve then, so its there to let the water still circulate round the system after the port valve has shut or all the radiators are shut, or if the pump was to overrun after the boiler switched off it would prevent the pump from burning out or overheating due to the water having nowhere to go.If that makes any sense. is this correct?. thanks
     
    Last edited: 7 Jan 2016
  5. ross94

    ross94

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    so is that what it is for then? ta
     
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  7. Nozzle

    Nozzle

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    That's my guess, yeh

    Nozzle
     
  8. MANDATE

    MANDATE

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    Relative has similar system, with one radiator furthest away from boiler not getting hot.
    It was easier for water to go back to boiler via by pass valve, rather than radiator.
    Problem solved by slightly closing this valve and restricting the flow through it.
     
  9. stuartR1963

    stuartR1963

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    Hard to tell without pictures,but it does indeed sound like a bypass valve. useful if you have a pump overrun(giving the water somewhere to go to stop the pump burning out or overheating due the water having nowhere to go. or if all radiators were switched off for some reason, it will still allow the water to flow round the system. I believe it is there just to protect the pump. so leave it alone.
    It could also be a balancing valve but more likely a bypass. thats my guess
     
  10. wannocks

    wannocks

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    Its also there to protect the boiler to allow some flow even when most of the rad valves are closed.
     
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