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

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.
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