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Thud or thumping sound at kitchen sink

FizzFizz Member Posts: 522
What causes a thud or thumping sound when turning-on kitchen faucet?


  • ChrisJChrisJ Member Posts: 11,274
    Hot water causing copper pipe to expand and rub against a floor joist or stud in the wall?

    Pretty vague question. :(
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • FizzFizz Member Posts: 522
    It occurs on turning on cold water, and is more pronounced when water has been off for a period of time.
  • JUGHNEJUGHNE Member Posts: 7,210
    Water you have a back flow preventer/check valve on your water service?
  • hot_rodhot_rod Member Posts: 13,879
    It could be the small plastic diverter check valve inside that engages when you use the spray hose on some faucets.

    If it has a spray hose try flicking that on and off when the faucet is running.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
    rick in Alaska
  • FizzFizz Member Posts: 522
    Don't know if service has back-flow preventer. Will try Hot Rod's suggestion. Thanks to all!
  • JohnWayneJohnWayne Member Posts: 30
    Another trick to solve this is to install an air arrestor in the line. You can purchase pre made or just shut the water off to your house drain the line and install a tee in the line. Extend a pipe up 3 or 6 inches, and cap it. Turn the water back on and your done.

    Sometimes in restrooms you may notice a capped line next to a urinal extending up from the main water feed. Same idea.

    It might be you have high water pressure in your home. If it's what I'm thinking it should be several quick thus upon turning on the water that deminish the longer it's running. Sometimes a thud when you shut the valve as well.
  • Mark EathertonMark Eatherton Member Posts: 5,843
    edited March 2016
    Try pulling the rinse hose completely out of the sink and see if it jumps when opening or closing the faucet. Mine does.

    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • JUGHNEJUGHNE Member Posts: 7,210
    On some new faucet installs sometimes the rinse hose would act up. I would pull out the hose, turn the water on and just squeeze the sprayer enough to get the spray diverter to "machine gun" chatter. This would loosen up or flush the diverter. Not sure what it did but kept me from having to take apart a new faucet for nothing. FWIW
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