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  1. #1
    An old sod
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    Cool Help with motorised valve control!

    Hope there are some electrical experts on here!
    Have a new 40mm 12VDC motorised valve for the pool engine room.
    Need to have it to close when the solar switches on a 230VAC plug and open when that plug switches off.
    The 12VDC motorised valve opens with power on and closes with reversed polarity when the 230VAC powers off.
    Ok what sort of switching unit to control this?
    And yes have a couple of 12VDC transformers.
    Thanks
    "Why work on Wednesday and stuff up two good long weekends"
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  2. #2
    amateur expert dugimodo's Avatar
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    Default Re: Help with motorised valve control!

    A simple relay running off a 12V transformer powered by the 230V would work. It seems a bit convoluted to me but would do the job. You can get realys that change over when power is applied or that either open or close the contacts so you just make a circuit using the relay as an on switch and choose the relay type based on when you want it on.
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  3. #3
    An old sod
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    Default Re: Help with motorised valve control!

    Quote Originally Posted by dugimodo View Post
    A simple relay running off a 12V transformer powered by the 230V would work. It seems a bit convoluted to me but would do the job. You can get realys that change over when power is applied or that either open or close the contacts so you just make a circuit using the relay as an on switch and choose the relay type based on when you want it on.
    Can you link to one please?
    How does it close the valve after the 230VAC powers off?
    "Why work on Wednesday and stuff up two good long weekends"
    W10 Home 64-bit,Intel Core i7 @ 3.20GHz,RAM 16GB, ROG STRIX B360-I GAMING (LGA1151),PHL 257E7 (1920x1080@60Hz),4095MB NVIDIA GeForce GTX 1050 Ti (EVGA), 1TB SSD, 4TB HDD, 4TB USB SSD.

  4. #4
    amateur expert dugimodo's Avatar
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    Default Re: Help with motorised valve control!

    I was just talking about car relays that just happen to be 12VDC, you'd need to make up a cct using them so that it applies power in the correct polarity in eact state, but if you only need momentary power to open and close the valve then it's more complicated and would need a timer or something.

    I'm no expert, I'm just going on electronics training from my apprentice days in the late 80s here....
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  5. #5
    amateur expert dugimodo's Avatar
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    Default Re: Help with motorised valve control!

    using 2 of these https://www.jaycar.co.nz/30a-horn-relay-spdt/p/SY4070

    Here's a crude cct that will just reverse the power to the valve when power is applied to or removed from the relay.
    Not sure if that achieves what you want or not but it's just a suggestion, and a fun exercise for me. I'd suggest double checking it though, I'm very rusty.Click image for larger version. 

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    also it's entirely possible I reversed the valve on and off outputs
    Last edited by dugimodo; 07-11-2018 at 04:30 PM.
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  6. #6
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    Default Re: Help with motorised valve control!

    Here's one using a Raspberry PI. https://www.instructables.com/id/Web...-Raspberry-Pi/

    Looks worth a look, seems quite thorough, on a quick browse, and you can use your phone to control it !!!

  7. #7
    An old sod
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    Default Re: Help with motorised valve control!

    Thanks guys for your input. My retired electrician mate has just returned from holiday and he has grabbed the valve and a few bits and thinks there will be no probs so will report back on progress!
    "Why work on Wednesday and stuff up two good long weekends"
    W10 Home 64-bit,Intel Core i7 @ 3.20GHz,RAM 16GB, ROG STRIX B360-I GAMING (LGA1151),PHL 257E7 (1920x1080@60Hz),4095MB NVIDIA GeForce GTX 1050 Ti (EVGA), 1TB SSD, 4TB HDD, 4TB USB SSD.

  8. #8
    An old sod
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    Default Re: Help with motorised valve control!

    Quote Originally Posted by stuffed View Post
    Thanks guys for your input. My retired electrician mate has just returned from holiday and he has grabbed the valve and a few bits and thinks there will be no probs so will report back on progress!
    All sorted! My Sparkie mate hooked up the Double Pole Double Throw (DPDT) with 1 x 12VDC being feed from the 230VDC and 1 x 12VDC feed on all the time.
    So simple he said and it works brilliantly.
    "Why work on Wednesday and stuff up two good long weekends"
    W10 Home 64-bit,Intel Core i7 @ 3.20GHz,RAM 16GB, ROG STRIX B360-I GAMING (LGA1151),PHL 257E7 (1920x1080@60Hz),4095MB NVIDIA GeForce GTX 1050 Ti (EVGA), 1TB SSD, 4TB HDD, 4TB USB SSD.

  9. #9
    amateur expert dugimodo's Avatar
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    Default Re: Help with motorised valve control!

    Sounds very similar to what I was trying to draw with the 2 x SPDT relays, great that you have it sorted.
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