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Thread: Backwash valve Hayward DE-4800

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    Backwash valve Hayward DE-4800

    I have a Hayward DE-4800 and the backwash valve started leaking last night (i.e., it won't close all the way and water is still draining through the backwash tube). How do I fix it, and what part(s) do I need?

    THANKS FOR YOUR HELP!!

    Chad

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    JasonLion's Avatar
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    May 2007
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    Welcome to TFP!

    Water leaking to backwash is usually caused by a bad spider gasket in the multi-position main valve.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Thanks for the Reply! Can i just replace the gasket, or do I have to replace the whole assembly?

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    Join Date
    May 2007
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    Round Rock, TX
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    you can replace the gasket only
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    do i just pull it out where the handle is? i have a hayward sp 722-d valve, if that means anything...

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    Join Date
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    You shut down the pump, then remove the screws around the perimeter of the top of the valve assembly. Then lift the valve out of the housing. On top you will see the big, round gasket, with "legs" that seal between each opening of the valve inlets and outlets. One or more of the legs on yours have deteriorated and are leaking. You just drop the new gasket in place, put the valve back in and reinstall the screws.

    One thing to be careful of, if the screws just thread into plastic... You want to get the threads of each screw into the existing threads in the plastic BEFORE you start tightening the screws. Otherwise the self-tapping screws will start new threads. This weakens the plastic and eventually the screws won't hold in place any more and you'll get to buy a new valve. You do this by gently turning the screw backwards while it's in the hole, as if you are loosening the screw. Keep turning until you feel the starter thread on the screw click into the thread in the plastic. Now you can tighten the screw and it will go into the threads that it tapped the first time it was installed.

    If the valve body has metal threaded inserts for the screws to go into, then you don't have to worry about that step.
    26,000 Gallon Gunnite IGP
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    my valve looks like this:

    http://www.discountpoolzone.com/pumpfil ... parts.html

    can i just pull the handle out of the top and replace the orings on it?

    THANKS AGAIN FOR ALL YOUR HELP!!

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    JasonLion's Avatar
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    May 2007
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    Yes, on a push-pull main valve you replace the O-rings. It is the same idea as a spider gasket and actually a little easier to do.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    I just got done replacing the o rings and it works great. I was afraid to just start pulling it apart and mess something up. Thanks for all your replies!!

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