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Can anyone tell me what these are?

Discussion in 'Plumbing and Central Heating' started by Pauli11, 17 Sep 2019.

  1. Pauli11

    Pauli11

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    Connected on the cold mains in to my unvented pressurised hot water cylinder. Could anyone tell me what the 2 connections are in photo A above the stop cock.
    Photo C closeup looks like a Non return valve, and photo B a pressure reducer? would that be right?

    I had a plumber in about 5 years ago, and Im sure he fitted at least one of these. I remember at the time, he said the pressure coming in to the house was too high? But surely the Combination valve set a few feet further above this would have regulated that to 3 bar anyway negating the need for a further pressure reducing valve??
    Had to visit twice and charged me £320 for the privilege too.

    Just curious.
     

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  3. oldbuffer

    oldbuffer

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    1. Photo C looks like a Y strainer, to filter debris out of the incoming water.
    2. Less sure about photo B but I thinks its a pressure reducing valve.
     
  4. ianmcd

    ianmcd

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  5. FiremanT

    FiremanT

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    Depending upon the configuration, you sometimes have to set the incoming mains to 3bar to equalise pressure at,eg, showers.
     
  6. Pauli11

    Pauli11

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    cheers. So effectively I have two checks at 3 bar? the Pressure reducing valve and further up the pipe, the Combination valve also set at 3 bar?
     
  7. Madrab

    Madrab

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    Is there a Tee after that valve but before the unvented combi valve?
     
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