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Zone Valve Hammer?

Richard D._2
Richard D._2 Member Posts: 156
in THE MAIN WALL
The cust. said this is a new prob.!!!We heard that b4...I have 2 H/WV8043 Zone valves...3/4" and a 1"..When both are running all OK..When the 1"shuts while cir is running u get a water hammer noise..??? Any input??? Thanks Richard

Comments

  • kevin
    kevin Member Posts: 420
    it has a oo7...

    or somehing of the like for a circ.right? Install a B&G ser. 100 or a Taco 110. The problem will dissappear. kpc
  • Steve Eayrs
    Steve Eayrs Member Posts: 424
    Hate to admit it but....

    I have installed these in backwards a time or two. Could easily be the problem....if you are human too.
  • stevel
    stevel Member Posts: 25
    noisy valve

    I have had the same problem on my system, cured it by replacing the air scoop with a B&G air separator.I'm guessing it might be a small air pocket in that line


  • Dana
    Dana Member Posts: 126


    Because of the velocity of the water with this type of motorized zone valve, when it closes while another zone is calling and the circ. is running, it will bounce the ball on the end of the driver off its seat a few times before it closes tight. This is especially noisy if for some reason there are also flow checks, which are not needed but I see installed on zone valve systems all the time. Since I don't believe there is anyway to slow the closing of this valve, I've had very good luck with either a bypass to absorb some of the flow or changing them to Taco's, which close slower. Try running the sytem with 1 zone, open the one banging manually and closing it slowly with the manual lever and see if you can make it stop banging. This is also assuming that all piping, circulator, exp. tank, etc. are properly sized and located.
  • todd s
    todd s Member Posts: 212
    noisy valves

    We just fixed a system with a similar complaint. Burnham V14 boiler w/ 3 honeywell valves. This boiler came with a Grunfos circ on return and several years ago it was swapped with a Taco 007. Apparently the wiring lined up so the circ was installed backwards. This had been this way for at least 7-8 years until the noise started. The extrol tank had become waterlogged and aggravated a bad situation. Replaced extrol and flipped ciculator - problem solved.
  • Richard D._2
    Richard D._2 Member Posts: 156
    thanks

    for all your help!I will let u know what I find.Richard
  • HeavyP
    HeavyP Member Posts: 52
    banging

    I have had this problem when the circ. is on the return and the z/v is on the supply. The z/v cant close right away b/c the forced water keeps pushing the ball in the z/v open. Put the circ on the supply. Gerry
  • Jim Erhardt
    Jim Erhardt Member Posts: 52


    About 15 years ago, I developed a control that wires between the ZV end switches and the TT terminals of the pump relay to momentarily shut off the pump whenever an end switch opens. I received a U.S. Patent on the control and it worked like a charm, totally eliminating hammer in problem systems. That said, I still work a "9 to 5" here at Slant/Fin so that will give you an idea of how well the marketing end of my project went... :(

    As it turns out, it all has to do with the way the pump sheds its head when a fast-closing valve (like the Honeywell unit) closes. With the pump on the return, the expansion tank on the supply and the ZVs just downstream of the expansion tank, the system will experience a sudden drop in pressure when the valve closes, causing the hammer. To reduce/eliminate the occurance of the hammer problem, "pump away" from the expansion tank. This is most commonly done by placing the pump on the boiler supply header and placing the expansion tank between the pump and the boiler supply tapping. Place the ZVs on the supply downstream of the pump or on the return header (whatever floats your boat). Pumping away not only helps eliminate air problems, but it will help with this problem as well.

    I think I still have some of those controls kicking around in my basement somewhere...
  • Unknown
    Unknown
    Jim could I

    see one of your controls. I am curious about what it will do. If it is covered by patent you are protected.
  • eddie grierson_3
    eddie grierson_3 Member Posts: 51
    Try This

    I used to have a problem with this, I have been pumping away for years and used the honeywell zone valves on the supply header. Then I went to one of Dan's classes and he recommended putting the zone valves on the returns. It works, I haven't had any more problems. Also a pressure differintial valve would help. GOOD LUCK

    Eddie G.
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