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* THE FORUM FOR ALL THOSE INTERESTED IN BUILDING AND OPERATING MODEL SUBMARINES *



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For further details of any events shown here also see the "Shows and Events" section on the forum

*HOPING FOR A BETTER 2021 AND MORE OF THESE EXCELLENT FREE EVENTS ALL AROUND THE COUNTRY!

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CANCELLED because of coronavirus. Papplewick Pumping Station, Nottingham, Sunday 12th & Monday 13th April
CANCELLED because of coronavirus. Bournville Sub Day, Sunday 10th May 2020

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(CANCELLED) Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

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Model Boat Convention, Haydock Park (Cancelled this year)

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CANCELLED. Bournville Sub Day, Sunday 13th September

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(CANCELLED) Club Submarine Regatta, Furness MBC, Barrow in Furness, Sunday 20th Sept 2020

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Latest topics

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Statistics

Our users have posted a total of 11254 messages in 1843 subjects

We have 882 registered users

The newest registered user is Marksman303

    Release valve info needed..

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    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3003
    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    Release valve info needed.. Empty Release valve info needed..

    Post  Tom(ADMIN) on Sat Dec 14, 2013 10:59 am

    I've had a slight change of plan with the Type XX111 ballast system, instead of using that large water pump, I'm thinking of using my little Koge air pump, and inflating a small(ish) bag instead. I can attach the bag on top of the cylinder with velcro, that will save a lot of internal space in the cylinder.

    Question: If I use the air in the cylinder to inflate the bag, what's the best way to release that air and return it to the cylinder? I'm guessing a small valve of some sort (I cannot find the solenoid valve that came with the pump) something like a servo operated pinch valve, along  the lines of those used in the Sheerline boats? Or is there a better and easier way of doing it?

    The smaller the better...


    Release valve info needed.. Untitl14


    Richard
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    Tom(ADMIN)
    AMS Forum Owner

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    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    Release valve info needed.. Empty Re: Release valve info needed..

    Post  Tom(ADMIN) on Sat Dec 14, 2013 11:00 am

    I've just tried this pump, and running on 4.8v it filled a small SHG bag in seconds, so it should be ideal for the Type XX111.


    Richard
    david f
    david f
    AMS Treasurer

    Posts : 2137
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    Age : 70
    Location : Cumbria

    Release valve info needed.. Empty Re: Release valve info needed..

    Post  david f on Sat Dec 14, 2013 2:00 pm

    I don't use air systems much but you are talking about a valve for fairly low pressure, low pressure drop and no external leaks.

    Modified Schrader (tyre) valves always come to mind but they are not quite right here - pressure a bit low.

    I would have thought that the pinch valve would do the job. The only likely leaks would provide you with a fail safe.

    David

    PS Just thinking about this one. Will the bag not need the pump to also empty it? (My lack of experience of air systems is showing!)


    Last edited by david f on Sat Dec 14, 2013 2:06 pm; edited 1 time in total
    avatar
    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3003
    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    Release valve info needed.. Empty Re: Release valve info needed..

    Post  Tom(ADMIN) on Sat Dec 14, 2013 2:05 pm

    I was thinking of a pinch valve, but then someone suggested a tyre valve(which I haven't got)so a pinch valve is on the bench as we speak...as you say, the air leak may come in useful.


    Richard
    david f
    david f
    AMS Treasurer

    Posts : 2137
    Join date : 2010-11-10
    Age : 70
    Location : Cumbria

    Release valve info needed.. Empty Re: Release valve info needed..

    Post  david f on Sat Dec 14, 2013 2:08 pm

    Plse see my edit, Richard.

    David
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    Tom(ADMIN)
    AMS Forum Owner

    Posts : 3003
    Join date : 2010-11-05
    Age : 61
    Location : Nevada, USA

    Release valve info needed.. Empty Re: Release valve info needed..

    Post  Tom(ADMIN) on Sat Dec 14, 2013 2:16 pm

    It's a one way pump David...more's the pity.


    Richard

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