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Offlineozzysmygod
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A Little confusion- converting an All American 921 into a sterilizer
    #10270033 - 05/01/09 06:31 PM (14 years, 10 months ago)

Okay ive read on the forums its possible to convert a 921 into a sterilizer by adding a toggle valve. However someone somewhere said the canners are not designed to be used as autoclaves and might be dangerous. Surely they use the same lids and bases?

Secondly does a normal canner have an over pressure plug? does this need to replaced to, to turn it into a proper sterilizer? I think I saw one with 2 toggles? Thanks

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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: ozzysmygod]
    #10270163 - 05/01/09 07:00 PM (14 years, 10 months ago)

Pressure cooker = stovetop autoclave, for our purposes. As long as it can get up to 15 psi, all molds, bacteria and endospores will be dead after sterilizing

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Offlineozzysmygod
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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: ABC]
    #10270170 - 05/01/09 07:02 PM (14 years, 10 months ago)

Yeah I know but the toggle valve has more benefits

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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: ozzysmygod]
    #10270234 - 05/01/09 07:20 PM (14 years, 10 months ago)

If the toggle valve is made by AA, then use in it accordance with the manufacturer's instructions. If it's not... be careful using it.

But as ABC said, 15psi is what you need, if it does that already, you are golden.


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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: Doc_T]
    #10270457 - 05/01/09 08:10 PM (14 years, 10 months ago)

The overpressure plug on a canner does not seal below 0 PSI, thus they don't hold a vacuum.  You'd need to replace the nozzle and weight with a toggle valve, and replace the blowout plug with one made for a sterilizer.  However, that only leaves you with one means of overpressure protection.  Sterilizers have two: A blowout plug and a spring actuated relief valve, thus they're safer.
RR


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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: RogerRabbit]
    #10270502 - 05/01/09 08:19 PM (14 years, 10 months ago)

'hold a vacuum'?
Can you explain that for those of us who don't have such a thing? Why would you want it to- don't you want it to open when the pressure hits zero?

"Please and thank you!"


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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: Doc_T] * 1
    #10270967 - 05/01/09 10:09 PM (14 years, 10 months ago)

As a canner cools to zero pressure, air begins to seep in to the unit as the contents cool.  This is important if you're canning, because as the jars of jam cool, a vacuum is pulled in the jar, sucking the lid down tight.  If there was a vacuum in the PC, the jars would never seal.

In a sterilizer, the unit is completely air tight, therefore as it cools to below 212F/100C, no air is admitted, thus a vacuum is pulled in the vessel.  This vacuum holds until you lift the toggle to release it.  I do this in front of a laminar flow hood, thus only sterile air is admitted to the sterilizer.  If you use a sterilizer for agar, it will boil over as a vacuum is pulled, so you'd want a canner, OR you'd have to babysit the sterilizer to lift the toggle exactly as zero psi is reached.

I prefer a sterilizer when preparing rye grain or sawdust/woodchip bags.  The sterilizer ensures the contents of the bags remain completely sterile, even if it's a few days before I can get to them after sterilization.  Nothing bad is admitted, and besides, nothing can grow in a vacuum.
RR


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Re: A Little confusion- converting an All American 921 into a sterilizer [Re: RogerRabbit]
    #10271065 - 05/01/09 10:33 PM (14 years, 10 months ago)

Oh, of course!

Thanks for a concise and practical answer- as always.


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