Subject:
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Re: Home-made One-way valve
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 20 Dec 2001 03:38:50 GMT
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Original-From:
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Shawn Menninga <SMQ@DWARFRUNE.saynotospamCOM>
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Viewed:
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991 times
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At 01:30 AM 12/20/01 +0000, c s soh wrote:
> Somehow I'm a bit queasy about this business of "storing vacuum" in a
> tank.
>
> So I checked with the local supplier of industrial gases. If you need a
> tank of compressed air, that's no problem. But a tankful of vacuum, er
> that's not listed in the catalogue.
>
> It seems the only way to maintain vacuum is to have a motor-driven
> exhauster working all the time. That's how its done in the vacuum brake
> system on trains.
I think the reason for that is simply that you can't store very much
"vacuum" in a tank. While you can pressurize a tank to several hundred
PSI or better, for vacuum you're limited to completely (well, OK, nearly
completely) evacuating it--a mere -15 PSI or so (one "negative"
atmosphere). Not a very efficient way to do it as your "stored vacuum" is
soon exhausted
by any use.
-SMQ Shawn Menninga smq@dwarfrune.com
--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--=--
"...to live deliberately...to put to rout all that [is] not life, and not,
when I [have] come to die, discover that I [have] not lived." -- H. D. T.
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Message is in Reply To:
 | | Re: Home-made One-way valve
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| Alternativeley you can continue using the valve with the old style pump and have an air tank (if you own two) on each side i.e. one that holds the vaccum and one that holds the pressureized air. but... theres still the problem of flipping the valve (...) (23 years ago, 19-Dec-01, to lugnet.robotics, lugnet.technic, lugnet.build)
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