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Differential bypass valve adjustment

Discussion in 'Plumbing and Central Heating' started by u33446z, 28 Feb 2020.

  1. u33446z

    u33446z

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    My CH system is fitted with a bypass valve (see photo) as my Worcester Greenstar Ri boiler has a 3 minute over-run mode when heating demand stops. But I can't seem to alter the setting on the valve. If I rotate the black knurled collar it doesn't seem to change anything (the scale rotates with it). What am I missing? The valve is installed the other way up compared to this photo.

    automatic-differential-by-pass-valve-22-mm-straight_21382_P_3.jpg
     
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  3. Terrywookfit

    Terrywookfit

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    Why do you want to move it ?
     
  4. u33446z

    u33446z

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    I want to be able to adjust the pressure setting.
     
  5. Terrywookfit

    Terrywookfit

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    For what reason?
     
  6. u33446z

    u33446z

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    Putting aside whether or not I need to adjust the valve, since it is adjustable I want to know how to adjust it.
     
  7. D_Hailsham

    D_Hailsham

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    Most ABVs need to be turned many rotations to make any impression. If you have only turned the knurled collar a couple of rotations you may not see any noticeable difference in the position of the red marker.

    Count the number of turns so you can reset the valve to its original position.

    Please explain why you need to adjust the ABV. It could be that the 'problem', which you presumably have, is not caused by the ABV.
     
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