Diffusion pumps

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Roberto Ferrari
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Diffusion pumps

Post by Roberto Ferrari »

Hi
After more that 40 years dealing with high vacuum devices, here are the smallest and the largest pump I came along.
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Richard Hull
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Re: Diffusion pumps

Post by Richard Hull »

I would hate to have to pay for the oil in that big one.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
Roberto Ferrari
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Re: Diffusion pumps

Post by Roberto Ferrari »

Yes, 250 mL...
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russssellcrow
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Re: Diffusion pumps

Post by russssellcrow »

Who made that Whopper? (I'm guessing Consolidated)
What are the specs?
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Rich Feldman
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Re: Diffusion pumps

Post by Rich Feldman »

Thanks for sharing. My only diffusion pump is tiny, never used here, and lost under workbench.

They do come bigger.
DIFF-PUMP-48-INCH-WEBSITE-7-24-15-640x1024-3613906767.jpg
That's a 48-inch 100,000 l/s unit at http://www.ivicorp.com/diffusion-pumps/

Anybody know the pump specs at world-class vacuum test chambers?
All models are wrong; some models are useful. -- George Box
Roberto Ferrari
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Re: Diffusion pumps

Post by Roberto Ferrari »

Hi Russell

The largest is a Edwards Diffstak 160/700, 760 L/s (for N).
From a GC-MS of the 70's.
Richard Hester
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Re: Diffusion pumps

Post by Richard Hester »

The prices of used diff pumps on Ebay have gone sky-high. I was lucky to get while the getting was good a few years back. I have an Agilent AX-65 (needs a heater assy), a CVC 3" water-cooled pump, and a VBC setup putting together a small CVC air cooled diff pump with a Welch 1400 backing pump.
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Emma Black
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Re: Diffusion pumps

Post by Emma Black »

I have an Edwards 160/700 as well, grabbed for free but uses tons of oil and power. Even clocked back to 110v from 240v cooling has been an issue, on the good side though it pumps down pretty quickly.
I love how simple these things are inside:
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Richard Hester
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Re: Diffusion pumps

Post by Richard Hester »

The concepts behind their operation are pretty simple and basic, too. I wonder who came up with the first diff pump?

I just looked it up - the diff pump was invented all the way back in 1915...
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Re: Diffusion pumps

Post by Richard Hester »

I also forgot that I have a smalish air-cooled Edwards diff pump floating around in my stuff.
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Richard Hull
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Re: Diffusion pumps

Post by Richard Hull »

I diff pumped fusor IV 2004-2017. I loved the diff pump until I bought a complete working Turbo system at HEAS in 2016 for $250 from Bill Connery.
That old diff pump in packed away just itchin' for the demise of the turbo system and its immediate reinstatement as lord of the secondary pumping system in my fusion setup. I go with what works as long as it works. Diff pump systems never die and are bullet proof in the hands of a person who understands them.

Richard Hull
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Partially installed fusor IV setup  circa 2004 with diff pump hooked into vacuum line.
Partially installed fusor IV setup circa 2004 with diff pump hooked into vacuum line.
Diff pump purchased at HEAS fleamarket in 2003 from Bill Connery for $50.00
Diff pump purchased at HEAS fleamarket in 2003 from Bill Connery for $50.00
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
The more complex the idea put forward by the poor amateur, the more likely it will never see embodiment
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