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Thread: 12 volt solenoid valve

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    12 volt solenoid valve

    I'm trying to build a muriatic acid feeder using the suction side of my pool pump. I've tried the emiters but could not get the flow slow enough. So using a timer with a solenoid shutoff valve will work provided I can get a valve that is resistant to muriatic acid. Anyone know of one, it does need to be 12 volt DC.
    Thanks.
    Tim
    Tim
    10,000 gal concrete pebble tech
    SWG. 8 yo, Cartridge filter
    Pentair single speed pump, Solar Heat
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    Mod Squad Bama Rambler's Avatar
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    Re: 12 volt solenoid valve

    The problem isn't just that you need a valve that will operate on 12 volt DC and is compatible with HCL, but you also need one that will operate at near zero psig.

    Also you need the elastomer to be either EPDM, Neoprene or FKM (Viton). Buna-N (NBR) won't work.

    Unfortunately there is no cheap solution when it comes to HCL.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: 12 volt solenoid valve

    Quote Originally Posted by Bama Rambler View Post
    Unfortunately there is no cheap solution when it comes to HCL.
    I kinda figured that. Wonder if there is a valve than will work for a couple of months using a 3 or 4 to 1 dilution. If the valve is cheap enough, replacing it every 4 months or so may work.
    Tim
    10,000 gal concrete pebble tech
    SWG. 8 yo, Cartridge filter
    Pentair single speed pump, Solar Heat
    Tampa, FL

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    crusemm's Avatar
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    21,000 gal In Ground Plaster pool; Nautilus FNS 60 DE filter; WhisperFlo WFE-6 pump; Polaris booster pump and pool cleaner;Rainbow Lifegard HiFlow Chlorine Feeder (not in use); Purex Triton pool light;Hatteras spa light; Intermatic model PF122T Freeze Sentry pump controller; Sta-Rite U-3 Skimmer.

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    Re: 12 volt solenoid valve

    Thanks crusemm, the cheap one might work, for $14 it's worth a try. It did say it can only handle a 7' head pressure. I have no idea what suction my pump has, but I can reduce the pressure/suction by using a hose clamp and squeezing the supply tube.

    Anyway here's my setup. Using one of crusemm valves and a wall wart 12 volt adapter like this: Amazon.com: Angelelec DIY Open Sources Power Supply, Wall Adapter Power Supply 12Vdc 1A (American Standard), High Quality Switching Accessories

    And a timer that will count in seconds like this one: Digital Programmable Timer Socket Plug Wall Home Plug-in switch Energy-Saving Outlet - - Amazon.com

    I'll start out with a 1:3 diluted solution of muriatic acid and see what happens.

    Comments?
    Tim
    10,000 gal concrete pebble tech
    SWG. 8 yo, Cartridge filter
    Pentair single speed pump, Solar Heat
    Tampa, FL

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    Re: 12 volt solenoid valve

    I have some gently used Burkert Solenoid valves which I believe have FKM seals (i can double check later) that I'd sell for a very reasonable price (considering they would be going to an interesting project). The valves however are 24V. Let me know if you are interested.

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    Re: 12 volt solenoid valve

    Thanks Steve#1 but it looks like the Burkert valves need a minimum of 7 psi to operate.
    Tim
    10,000 gal concrete pebble tech
    SWG. 8 yo, Cartridge filter
    Pentair single speed pump, Solar Heat
    Tampa, FL

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    crusemm's Avatar
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    Re: 12 volt solenoid valve

    timjet, I don't think that suction pressure is the issue, just head. Based on the description, it sounds like the weight of the water helps keep the valve shut, probably due to the surface area on the back of the valve disk. As the height of the water increases, the pressure holding the valve shut goes up (psi holdiong the valve shut being a combination of height of the water and surface area of the disk), until it would get so high that the coil can't lift it anymore. I think pump suction would not be felt the same way as static head above the disk. a 7 foot high column of water would exert 36 psi pressure. A perfect vacuum on the other side exerts 33 inHg or 16 psi. So even with a perfect vacuum, it wouldn't be enough to hold it closed, even if it worked the same way. At least that's what my nuculer math tells me.
    21,000 gal In Ground Plaster pool; Nautilus FNS 60 DE filter; WhisperFlo WFE-6 pump; Polaris booster pump and pool cleaner;Rainbow Lifegard HiFlow Chlorine Feeder (not in use); Purex Triton pool light;Hatteras spa light; Intermatic model PF122T Freeze Sentry pump controller; Sta-Rite U-3 Skimmer.

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    Re: 12 volt solenoid valve

    Thanks for the explanation crusemm. I'm going to give it a try with the cheap valve you suggested. For resistance to muriatic acid I think nylon fittings and Polypropylene tubing should work, is this correct?
    Tim
    10,000 gal concrete pebble tech
    SWG. 8 yo, Cartridge filter
    Pentair single speed pump, Solar Heat
    Tampa, FL

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    Mod Squad Bama Rambler's Avatar
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    Re: 12 volt solenoid valve

    Quote Originally Posted by crusemm View Post
    A 7 foot high column of water would exert 36 psi pressure.
    Actually a 7' high column of water would be 3.04 PSIG and a vacuum is -14.7 PSIG.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    crusemm's Avatar
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    Re: 12 volt solenoid valve

    you are correct, i cannot math good
    21,000 gal In Ground Plaster pool; Nautilus FNS 60 DE filter; WhisperFlo WFE-6 pump; Polaris booster pump and pool cleaner;Rainbow Lifegard HiFlow Chlorine Feeder (not in use); Purex Triton pool light;Hatteras spa light; Intermatic model PF122T Freeze Sentry pump controller; Sta-Rite U-3 Skimmer.

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