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Papplewick Pumping Station SUBMARINE Day. 31st March - 1st April 2024.

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Most users ever online was 180 on Tue Nov 05, 2019 6:03 am

Latest topics

» Futaba -868/915mhz equipment
Pump for bladder system EmptySun Jun 09, 2024 10:47 pm by tsenecal

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Pump for bladder system EmptySat Jun 01, 2024 1:15 am by geofrancis

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Pump for bladder system EmptyTue May 28, 2024 8:30 am by Deep Diver (Fred)

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Pump for bladder system EmptyWed May 22, 2024 8:10 am by david f

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Pump for bladder system EmptyTue May 07, 2024 3:26 pm by geofrancis

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    Pump for bladder system

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    geofrancis


    Posts : 293
    Join date : 2021-09-24

    Pump for bladder system Empty Pump for bladder system

    Post  geofrancis Wed May 10, 2023 12:55 pm

    I have been trying to find bidirectional water pumps, does this one look like it would work? the only other ones I have seen are peristaltic pumps buit they are rather slow. or should i just get a pair of diaphram pumps? one for in and one for out.

    https://www.aliexpress.com/item/1005004264135231.html

    found another one that might work.

    https://www.ebay.co.uk/itm/314508591141
    avatar
    maxx78


    Posts : 18
    Join date : 2022-05-02
    Location : Hamburg, Germany

    Pump for bladder system Empty Re: Pump for bladder system

    Post  maxx78 Wed May 10, 2023 3:27 pm

    the pump from Ebay is geared pump and in my experience they do not hold the pressure and you lose ballast over time.
    On my first try i pinched the hose with a servo to prevent the bladder from empting itself.

    There are some powerful peristalic pumps but you need some space for them.

    The Grothen G1128 does 700ml/min:  https://www.aliexpress.com/item/1005004028135569.html

    i couldn't find any dimesions for it, only for the G28 model which provides 500ml /min : https://de.aliexpress.com/item/1005004524631196.html

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    tsenecal
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    Posts : 314
    Join date : 2015-04-01

    Pump for bladder system Empty Re: Pump for bladder system

    Post  tsenecal Wed May 10, 2023 6:44 pm

    i agree with maxx78 on both counts:

    1) geared pump == bad, peristaltic == good
    2) flow means everything, and you want something that will fill the bag in 20 seconds or less.

    but i will add these:
    3) most of the 400 size motor pumps (motor is 28mm or so in diameter) are too small to be effective
    4) if the seller doesn't post a flow rate, it is not worth looking at
    5) if you don't find a pump that will fill fast enough, use more volts. (buy the 12v model, run it at 24v)
    6) good peristaltic pumps aren't cheap

    i just got one of these:
    https://www.ebay.com/itm/284844980346
    this is just an example, although this seller is in america, they come from china, so you should be able to find an international seller.

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    geofrancis


    Posts : 293
    Join date : 2021-09-24

    Pump for bladder system Empty Re: Pump for bladder system

    Post  geofrancis Wed May 10, 2023 9:06 pm

    this one looks like it might tick all the boxes

    https://www.aliexpress.com/item/32817707131.html

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    tsenecal
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    Posts : 314
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    Pump for bladder system Empty Re: Pump for bladder system

    Post  tsenecal Wed May 10, 2023 10:34 pm

    I agree with you on that pump, one recommendation, use the "Pharmed BPT tube" version. that tubing lasts longer and is more flexible than the silicon tubing.

    geofrancis likes this post


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