The Association of Model Submariners.

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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

*2021 AND SOME EVENTS ARE BEING PROPOSED. Keep them coming and let us know the details!

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(CANCELLED in 2020) Submarine, Boating & Sailing Weekend, Norwich MBC, Weekend of 25,26th July

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Bournville Sub Day. Sept 2021 is looking likely. More details TBA.

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Barrow in Furness Regatta and Sub day. Maybe in Sept 2021. Details TBA.

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

Latest topics

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Release valve info needed.. EmptyToday at 11:54 am by ex docky

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Release valve info needed.. EmptyYesterday at 5:51 pm by Cliffhanger67

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Statistics

Our users have posted a total of 11315 messages in 1859 subjects

We have 889 registered users

The newest registered user is armchairsubguy

    Release valve info needed..

    avatar
    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) 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
    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) 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 : 2156
    Join date : 2010-11-10
    Age : 70
    Location : Cumbria

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

    Post  david f 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) 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 : 2156
    Join date : 2010-11-10
    Age : 70
    Location : Cumbria

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

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

    Plse see my edit, Richard.

    David
    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) Sat Dec 14, 2013 2:16 pm

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


    Richard

      Current date/time is Thu Apr 22, 2021 12:19 pm