no idea the suggestion of yours
a soda (coke bottle) is holding 35 psi
beer bottle holds up to 80 something psi
champagne bottle will hold about 200 psi

i do a bit of scientific development
but saving a 5 or 10 cent bottle from a full flown idiot, packing green
beer, is not the highlight to my life.
at least i hope not.
Every buddy got a shortcut, they figure they can do, and has never been done
before.
the www is a highly competative site so make sure you have your
copyrigights, fully setup. personally saving a 10 cent bottle from an idiot
is not a big thing, especially when they will likely drop it.
good luck on your endevour.


"s9man3" > wrote in message
...
> Hi,
>
> I would like to be able to bottle fermented beverages in screw cap soda
> bottles (reusing them after I drink the soda), and I'm looking for or will
> try to invent a screw cap with a pressure release valve. If such a thing
> exists I'd be interested in hearing about it. Otherwise I am thinking
> about
> something along the lines of inserting a false bottom in a bottle cap and
> putting a spring behind it so that when the cap is screwed closed, the
> spring will keep air out but if the pressure of the carbonation gets high
> enough, the pressure will push back the false bottom compressing the
> spring
> and allowing gas to escape before the bottle bursts.
>
> Does anyone know if something like this exists or have any ideas on how to
> make one etc.
>
> (I have a couple of fizz keepers (a piston type and a bulb type) does
> anyone
> know if these will release excess pressure?)
>
>
> Thanks
>
>
>
>
>
>