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Thread: multiport valve question

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    Lmlduradenali's Avatar
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    Jan 2018
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    multiport valve question

    Hey guys so I have a bad multiport valve on my system which is Hayward, and replace with a whole new head today.

    Works flawless and seems great... do have a question about a minor noise I seem to get after I did the backwash....

    So I backwashed, turned pump off , rinsed, turned pump off and then turned back to filter, snd I can feel some pressure build up when going from rinse to filter... normal????

    All this is when the pump is off


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

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    Re: multiport valve question

    If you’re getting a “bang” and the waste is hard plumbed, then it’s probably “water hammer” from the valve suddenly stopping the flow of water going to waste. You can remove the sight glass before rotating the multiport back to Filter or install a vacuum breaker on the waste line.
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    Lmlduradenali's Avatar
    Join Date
    Jan 2018
    Location
    Myrtle beach SC
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    Re: multiport valve question

    Got ya...

    Can u explain a little more???? Like a pressure release valve on the waste line???


    12k Gallon in ground-hayward prologic controller -Hayward S244T sand filter
    Hayward super pump 1.5
    SWG Hayward T-Cell 9
    K2006C Test kit
    dolphin nautilus plus cleaner

  4. Back To Top    #4

    Re: multiport valve question

    Assuming that you have a hard plumbed waste line, the water flowing through it gets stopped immediately when the valve goes back to filter.

    If you use a vacuum breaker on the waste line, it allows air into the line when a vacuum is created by the water suddenly getting stopped.

    Google in-line vent, cheater vent, mini vent, air admittance valve etc. Any hardware store will have them.

    You put a T on the waste line and a female adaptor that you can screw the mini vent into.

    OATEY Sure-Vent Installation - Eliminate the Vent Pipe! - YouTube
    Support the site

    Trouble Free Pool is a free resource. The people who answer questions are volunteers. If you find the site to be a good resource, please consider making a donation to help support the site. Thanks.

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