On 2/28/05 11:54, "Pensioner" <al_knoll@PACBELL.NET> wrote:

> Always wondered how they fill those 16oz portable tanks.  Clearly there is a
> Schrader valve device in the top of the cannister.  However my attempts on a
> dead empty cannister to make that schrader valve release by using the same
> techniques one would use on a schrader tire valve have never worked.  We
> know that the production facility that fills these doesn't do it by hand.

That valve is for pressure release.  The 16oz bottles are probably filled
from a high pressure pump same as used at a fill station.  When I fill my 14
and 16oz bottles I use the adapter but I have chilled my small bottles.  I
also have a scale right next to me.  All the bottles I refill have their
empty (tare) weight written on them and the full weight as well.  Then I
simple add to weight or a little under.

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jimt
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