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Discuss Caleffi Pressure reduction valve causing noise in the Plumbing Forum area at

  1. angefoh

    angefoh New Member

    OK I have recently installed a Caleffi PRV to a 28mm pipe.
    Incoming pressure I am informed by local plumber is 7 bar and I have reduced this to 3 bar. The trouble is that the prv is causing a nasty vibration/humming noise when using any of the taps or shower down stream of the unit.
    Any ideas
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Have you fitted a shock arrestor?
    • Like Like x 3
    • Agree Agree x 1
  3. chris watkins

    chris watkins Plumber

    Which type & size of Caleffi PRV has been installed?
    Do you know if it is the dynamic type ?
    • Like Like x 1
  4. johnduffell

    johnduffell Member

    Could be the flow rate is so low for the size of valve it's bouncing. Have you got a straight run of pipe after the prv to stop it reflecting back and forth and resonating? Ps I'm not a qualified engineer.
  5. oz-plumber

    oz-plumber Plumber

    Post a pic of the valve installed.
    It could just be a faulty valve.

    I know the sound you are mentioning - it could wake the dead.
    Does the valve installed have and isolation valve built into the valve or is it just a plain PRV?
    If it has an isolation valve built into it, that could / would be the problem. Try finding a plain PRV and installing a ball valve on the inlet side
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