air vacuum pump question

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avbill

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Oct 18, 2007
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I picked up a vacuum pump a central pneumatic [ for a r134a use only]

its says its pulls a vacuum 28.3 hg @sea level. max. air pressure 90psi.

I just ordered a cactus juice stabilizer. how does this vacuum pump work? there are two ports one is noted r134a port the other air let 1/4" npt.

90 % is foreign language to me any help please thanks
 
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I'm guessing you got something like this?

2.5 CFM Vacuum Pump

(pics would help)

I bought this pump (or very similar), unthreaded the R134a fitting, and screwed in a 1/4" NPT nipple in it's place, then put a female quick connect on that.

on my chamber, I have a male quick connect - and I just use whatever air hose is handy at the moment to connect the two.
 
They will work but be aware of a couple of things...don't try to use it on a pancake compressor. It will work the compressor too hard and cause a lot of extra wear. Also, if using a small compressor, the vacuum level is likely to go up and down as the compressor cycles.

Another factor is the noise. They are fairly noisy and remember, you need to keep the pump running the full time you are pulling vacuum. This could be a few hours.

One last thing...I used one of these with the vacuum hold down for my CNC. When it was humid out, it would freeze up and the vacuum would drop, causing me to loose hold down and ruin parts.

My advice, get an old refrigerator compressor and make a super quiet vacuum pump or spend the $110 and buy a Robinaire 15310 rotary vane pump.

Been there and done that with venturi pumps and find they are not worth the time.
 
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