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    grundfoss flowcheck chatter (8 Posts)

  • steve steve @ 8:59 PM
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    when a flow check valve chatters, it's because of air in the system, but it doesn't seem like you have a problem with air, i believe your problem is in the flow check valve. without air in the system a bad flow valve could still make chatter sounds useually when the circ is on. i have replaced many flow valves for that reason. plus on a too much heat call the weight in the flow check is useually hung up.
  • Andyk Andyk @ 10:56 PM
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    Grundfos flo ck chatter

    What speed are you running the pump on ? Is the flow too much for the zone ? May want to look at it, the velocity can also cause the flo ck to chatter.
    "Call a Pro~in the end you will save some dough "
  • Kal Row Kal Row @ 2:35 AM
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    well i finally went back and..

    took off the pump, took out the checkvalve, shook it out good, cleaned up the check valve, put it all back together and now it's quiet - go figure
  • Kal Row Kal Row @ 12:30 AM
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    grundfoss chatter

    i have a system with a few grundfos 15-58fc's with the built in outlet check - one of which chatters - at least it sounds like thats it, it could be air - since it's the highest pump, hoewever - the system is has a spirovent on the primary and the secondary, - dont think it's cavitation with temp of 175 a static pressure of 20 - it seem to do it a lot less at colder temps, anyone?
  • Mark Hunt Mark Hunt @ 1:05 AM
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    that would be a new one on me. the only pump we have had any noise out of was a few taco IFC's. Never had a problem with the Grundfos. Please keep us posted though! Mark H To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Kal Row Kal Row @ 7:25 AM
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    i know,

    when i get a chance i will swap it with an adjacent pump - and will advise
  • hr hr @ 8:44 AM
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    Check to check

    for partial blockage. A solder ball, strip of teflon tape, wood chip, etc, may be hampering the flow or operation. I haven't had a problem, with chatter or noise, even when used in a variable speed assignment :) hot rod To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • BOB BOB @ 7:44 AM
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    you can take the pump out and change the check vakve. this is not a hard thig to do. i would try that first.
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