Dave,
Clever. But with repeated opening and closing, after a few days wouldn't there be a good deal of air inside the container, more perhaps than there would be with a bag which had been tightly closed and had the air squeezed out of it? Perhaps the design could be taken one step further, with a second valve on the bottom into which nitrogen could be injected? That should force the air inside the container out through the top valve.
Regards
Timo

ok .

i did that mason jar air valve mod before.. i posted on here about it.

this airbag notion, is a bit different i idea.

but that last post gave me a thought.

how about 2 vavles in the lid. one going in and one going out. instead of on the opposite end of the jar.. what would happen then?

RegulatorJohnson wrote:how about 2 vavles in the lid. one going in and one going out. instead of on the opposite end of the jar.. what would happen then?

I don't know if having the valve for injected gas on the bottom or on the top would work as I am hoping. But if all went as planned, once the inert gas had been injected, in time it should settle and the air inside should rise to the top and then be forced out by any further outgassing from the beans.

Regards
Timo

timo888 wrote:Dave,
Clever. But with repeated opening and closing, after a few days wouldn't there be a good deal of air inside the container, more perhaps than there would be with a bag which had been tightly closed and had the air squeezed out of it? Perhaps the design could be taken one step further, with a second valve on the bottom into which nitrogen could be injected? That should force the air inside the container out through the top valve.
Regards
Timo

Err, the containers are only for the storage, so they should not be too large as your quite correct in what you say. I split a 1 kilo roast into say 4 containers and then open them as I get to them. This means that container 4 won't have been touched for 8 days and the coffee is still pretty good by the time I do crack the seal. Each container contains around 2 days coffee, sorry should have made that clear (and hence why OK for hottop owners, who may even want to use smaller Jam/Jelly Jars).