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zone valve water hammer

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Joe Mattiello
Joe Mattiello Member Posts: 748
in THE MAIN WALL
Try Taco 570 series zonevalves to avoid water hammer issues. The Taco 571 is a slow-closing valve, as opposed to the spring action fast closing valve.
Joe Mattiello
N. E. Regional Manger, Commercial Products
Taco Comfort Solutions

Comments

  • bob elmore
    bob elmore Member Posts: 41
    zone valve water hammer

    I know this has been on the wall before, please one more time.
    contractor/customer called has 3 honeywell zone valves
    causing water hammer when they close. boiler change out to wm ultra, primary/secondary install.
    thank you in advance
  • brucewo1b
    brucewo1b Member Posts: 638
    Bob

    pull one of the retuern springs on the valve
  • Unknown
    Unknown


    Install a pressure differential Bypass Valve

    http://www.taco-hvac.com/products.html?current_category=204



    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Paul Fredricks_3
    Paul Fredricks_3 Member Posts: 1,556


    Make sure the valves aren't installed backwards. Then look here: http://www.heatinghelp.com/newsletter.cfm?Id=137
  • Ken_40
    Ken_40 Member Posts: 1,310
    Is the location...

    of the ZV's on the return, or the supply - immediately in front of the circulator?

    If so, you may have to change them.

    The probable cause is an unmatched circ. head dynamic. We tend to use wet-rotor circs. The high heads afforded when just one ZV calling can be pretty violent on closure. By choking off the circulator output via some form of throttling device, you may be able to maintain a 20 dT accross any combination of ZV "calls" - and reduce "dynamic head pressures" to a gentler factor, quieting down ZV slam and still staying around a dT of 20F.

    Got isolation valves on the supply side of the circ.? (never close the suction side isolation valve (if so equipped)) - close it until you see a dT of 20 degrees on the highest head zone. You'll be amazed at how nicely things will quiet down.
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