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Sub Weekend, Sheringham, North Norfolk, Sat/Sun 30,31 July 2022

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

Latest topics

» Simple telemetry system for openLRS (on 458Mhz)
Release valve info needed.. EmptyMon Jun 20, 2022 4:15 pm by geofrancis

» My collection of fibreglass moulds.
Release valve info needed.. EmptyFri Jun 10, 2022 3:23 pm by tsenecal

»  Submarine weekend, Sheringham, Norfolk,30th and 31st of July 2022
Release valve info needed.. EmptyFri May 27, 2022 3:22 pm by david f

» WW2 mini sub build
Release valve info needed.. EmptySun May 22, 2022 10:43 pm by SimonH

» Papplewick Pumping Station 2022
Release valve info needed.. EmptySat May 21, 2022 9:39 am by david f

» Akula 1/144 scratch build
Release valve info needed.. EmptyThu May 19, 2022 7:51 am by redboat219

» Darnell U class wanted
Release valve info needed.. EmptySat May 14, 2022 8:19 am by david f

» New modeller looking for U-Class to build
Release valve info needed.. EmptyFri May 13, 2022 3:35 pm by Paul Reilly

» K class plans
Release valve info needed.. EmptyFri May 13, 2022 10:18 am by david f

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2 posters

    Release valve info needed..

    avatar
    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3012
    Join date : 2010-11-05
    Age : 62
    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
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    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3012
    Join date : 2010-11-05
    Age : 62
    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


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    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 : 3012
    Join date : 2010-11-05
    Age : 62
    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
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    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
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    Tom(ADMIN)
    AMS Forum Owner


    Posts : 3012
    Join date : 2010-11-05
    Age : 62
    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

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