[modeleng] Re: Butane gas tank valve dismantling - OT

Hi there Al,

This looks like is needs a 20 pronged tool to go around the castillated 
fitting which is about 1" OD - there is noting inside the fitting which it 
looks like you can grib to appart from the thread which the gas fitting 
itself screws into. Am contemplating loctitiing something into this thread 
to try and unscrew the fitting with.


Yours,


Rich.

On Tue, 23 Oct 2007, Allen Messer wrote:

> Rich, I do not know about the GAZ containers, but the
> American style disposable Propane containers have a
> check valve that can be removed with the same type
> tool used to remove the valve stem from an automobile
> tire.  The threads are Right-handed in these bottles.
>
> Al Messer
>
>
> --- "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx> wrote:
>
>> Hi there All,
>>
>> I know this request is going to generate a flood of
>> "that's" dangerous"
>> and "needs to be done with care" e-mails, so before
>> I even ask the
>> question, let me just point out that we're a group
>> of experienced
>> engineers, and out Health and Safety person here is
>> working with us
>> (however that doesn't of course make us immune from
>> something going
>> wrong).
>>
>> We need a small air vessel for just a few weeks of
>> use, but the air vessel
>> needs to have a large opening at one end.
>>
>> It's been suggested that we use one of the old thick
>> walled blue Camping
>> Gaz butane cylinders, to the 1970's design, of which
>> I have a few spare.
>>
>> We've vented the cylinder and washed it out twice
>> with water (and I can
>> see why you'd want to do that - even after venting
>> for 12 hours, when it
>> had been closed again for 12 hours, the smell of gas
>> from it again was
>> quite bad).
>>
>> So here's the question - how do you remove the brass
>> insert which forms
>> the check valve, which I presume is screwed into the
>> top of the steel gas
>> cylinder? We don't have a special fitting to go on
>> the castellations
>> around the brass inserts outside, also we don't know
>> if it's a left of
>> right handed thread.
>>
>> I'm not keen to attempt anything before speaking to
>> someone who's done it
>> before, and perhaps suprisingly, perhaps not, I
>> couldn't find any web
>> pages on anyone who'd done it before.
>>
>> It's been suggested we could drill it out, or
>> machine the top off, but I'm
>> reluctant to do anything like that - I'd much prefer
>> to gently unscrew it
>> incase there are any hidden nasties lurking within
>> it.
>>
>> Does anyone have any thoughts, cautions, warnings,
>> advice?
>>
>> Yours,
>>
>>
>> Rich.
>> MODEL ENGINEERING DISCUSSION LIST.
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>
>
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