pressure release bottle cap

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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







Re: pressure release bottle cap


Try e bay

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=38172&item=4368516067&rd=1
they have them there all the time, I  know nothing about them.


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about
spring
anyone



Re: pressure release bottle cap



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about
spring
anyone
    THis whole thing is nuts. Bottle whatever you want to bottle when it has
stopped fermenting and become sugar free, by adding one cup sugar to a five
gallon (19litre) batch and that should do it. WARNING: Soda bottles aren't
really right for high pressure beverages like real wines etc. They tend to
explode. IOW, you have a horrible idea. UNLESS!, you are going to use
plastic!



Re: pressure release bottle cap


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Another word of warning - don't do this either!  Yeah, they hold
pressure better than glass, but only so far.  And when they pop, you'll
wake the neighbors - in the next county.  I know of two instances (one
last year in Richmond Virginia, and once in my college days) where some
"troubled youths" placed a small amount of dry ice in a 2-liter bottle,
capped it and set it somewhere.  About 10 minutes later (just enough
time for the "youths" to be elsewhere) the pressure overcame the
bottles, and boom.  Sure, it would take more than 10 minutes for the
pressure to build up from wine-making, but I wouldn't want to clean it
up later...

Even if it did work, opening the bottle would release the carbonization
from the wine, and you'd have a bottle of foam, most of which would be
dripping from your hand and the outside of the bottle.

Rob


Re: pressure release bottle cap


alt.beer.home-brewing:

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Soda is carbonated at 3 volumes - a little higher pressure than we use
for beer - so there shouldn't be any problem using plastic soda
bottles.  In fact, when I first started brewing that's what I used -
16 or 20 ounce bottles at first, then 2 liter bottles.  I never had
one explode.  (Of course I never bottled beer that hadn't finished
fermenting.)

Re: pressure release bottle cap


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.


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Re: pressure release bottle cap


Wow all that & brewing to.
My penny worth: rethink your principle objective & stick to the knitting,
which in this case (I think) is making damned good beer.
The methods that most of us use give excellent control of secondary bottle
fermentation without excess gas or the need for pressure relief.
Best regards & Good Luck,
Pete

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