I have a need to create a slight vacuum and I have one of those cheap,
Not usually IME. Is an ordinary vacuum cleaner any good? Probably only a psi or so. I have a cheap manual pump from ebay that does better, but still not a physicists' vacuum. IIRC some people have used old compressors out of fridges/freezers to get a better vacuum.
About a tenth of an atmosphere, according to this
A vacuum cleaner might do it, but I was looking for something a bit smaller and less cumbersome. I'm just starting beer and wine making again, after several decades absence. The vacuum is suggested to aid drawing the dissolved CO2 out, before bottling.
Tyre inflator pumps (the cheap sort) are not rated for continuous use and fail fairly quickly even assuming you can find a useable input port.
A diaphragm pump such as
Try a sex aids shop!
I'm not convinced that a vacuum cleaner is going to do much for you in that case.
Get a non return valve in the line between the compressor and what ever your vacuum is in , and reverse the polarity of the supply to the motor. It is almost certain to be a simple permanent magnet motor and will run backwards.
GH
Plenty of Youtube videos showing what is inside Example:
Note: I've had one fail - what failed the plastic piston which gets very hot with prolonged use.
on the other hand.....
Can't you just suck? It's not as if there's much volume.
Andy
What sort of beer volume are you talking about? Can't be that large, surely. How about a little hand-pump used for taking the air out of bottles of wine to stop them oxidising after opening?
alan_m used his keyboard to write :
Thanks - I have found a way to modify one....
Is it necessary? I've never come across any home brewers who do this.
Tim
No reason to remove dissolved CO2 from beer, more likely it's the wine, not the beer.
Can't be that large,
Be aware it will froth up, so take it slowly or you'll get beer froth in whatever you're using to supply the vacuum.
Unlikely, I'd have thought. Brian
Was there not an old trick using hot air sealing the canister then cooling it? Brian
I thought they used to use bellows for this? Sounds like you need an old harmonium or accordion and a valve or something. I'm sure there haves to be a low tech way of doing it as they have been making home brew beer of hundreds of years. Brian
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