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Tool Talk Discussion Forum

1920's air compresser ?

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oliverdave

01-09-2005 16:18:28




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I have a 1920's air compresser with a 110-230volt motor. The cut off switch for the motor has a valve for draining the pump but unlike newer compressers it puts it to a line that go's to a caped pipe. The pipe has two holes in the top cap, one has the drain line from the cut off switch in it and the other had a bolt in it when I got it. What would this pipe be for, because it looks like it was always was on the compresser.

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Gene Davis (Ga.)

01-09-2005 20:43:19




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 Re: 1920's air compresser ? in reply to oliverdave, 01-09-2005 16:18:28  
I have got a 1937 model Curtis air compressor that was hooked up similar and it was to an unloader on the intake valve of the compressor. Using a capacitor start motor on mine doesn't need this setup, especially since part of it is missing.



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Roger P.

01-09-2005 20:20:03




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 Re: 1920's air compresser ? in reply to oliverdave, 01-09-2005 16:18:28  
Sounds to me like this pump used to have a centrifugal unloader mechanism. The line would have gone from the check valve to this unloader mechanism to blow down the pump after it shut off. If the pump is as old as you say, this would make sense, since most older compressors used this system, or variations of it. This is a more robust system than a bleed valve on the pressure switch, and more expensive to build, hence, it has been replaced by the bleed valve on newer machines. I have no idea what make or model your machine is, but I theorize that at some point, the centrifugal unloader either failed, or bled air continuously through the second hole that is now plugged with the bolt. The owner probably ran a bleed line from this common pipe to a needle valve on the pressure switch to enable it to blow down without the centrifugal unloader. That's pure guessing on my part. If it is an older DeVilbiss, repairing the centrifugal unloader is not difficult, and well worth the effort. The two holes indicates to me that it might be a crankcase breather setup as well. Any pictures would help.

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oliverdave

01-14-2005 05:48:56




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 Re: 1920's air compresser ? in reply to Roger P., 01-09-2005 20:20:03  
The compresser says ''THE UNITED STATES AIR COMPRESSER CO. CLEVELAND O.''The year is 1928, its what i think you call a two stage compresser(one piston for volume and a smaller piston for compressing)Because the bleed valve line comes from a small tank under the compresser I wondered if it could be a water drain ,because the tank would catch the water, then when the compresser shuts down the bleed valve opens and the water gets blown into that pipe.

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Gene Davis (Ga.)

01-09-2005 20:18:08




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 Re: 1920's air compresser ? in reply to oliverdave, 01-09-2005 16:18:28  
I have got a 1937 model Curtis air compressor that was hooked up similar and it was to an unloader on the intake valve of the compressor. Using a capacitor start motor on mine doesn't need this setup, especially since part of it is missing.



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