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Machine Shop and Tool Talk

Brunner A414 compressor


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  #1  
Old 01-03-2015, 06:03:38 PM
pa93lightning pa93lightning is offline
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Default Brunner A414 compressor

I picked up an old brunner A414 from a co-worker with plans to use it for future use in my garage. Searching online there is very little to be found about these old units. The most useful information I found was here on smokstak and from dkamp. I'll post some pictures and what I do so hopefully it will help someone else out in the future and help document what little there is about these online.

here are a few pictures of the way I got it:






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  #2  
Old 01-05-2015, 03:41:30 PM
dkamp dkamp is offline
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Default Re: Brunner A414 compressor

So, here's some points-of-note on the Brunner A-414:

It's a two-cylinder, two stage unit with intercooler tube between the stages. The LP stage has a much larger bore than the HP stage, and this unit uses a crankshaft, rather than other Brunner products' eccentric design. Giveaway of the crankshaft design, is the access-end has a large cover, rather than just a hole large enough to slip a straight shaft through.

There's several different types of valves shown on the various Brunner parts lists. one (hp exhaust) is same as my V4, one type (LP exhaust and intake valves) appear to have drilling pattern similar to my V-4, and the others LOOK like they'd use the same flat reed as mine, however, they use a different reed and retention system concept... a round disk held by a bolt and belleville spring. The interstage valve (shown dismantled) is totally unlike mine, so obviously Brunner used different types at different times, with some overlap. Unfortunately, Aaron's interstage valve whas the one that was somehow problematic some time ago, and is now in need of replacement parts to work properly.

I'll extract and post exploded diagrams when I get back to my file server... and we'll see what Aaron figures out for his interstage valve. Judging by the rest of what I see, I'm thinkin' he may have a real gem there...
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Old 01-05-2015, 03:43:31 PM
dkamp dkamp is offline
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Default Re: Brunner A414 compressor

And a few more pictures...
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Old 01-05-2015, 03:55:03 PM
dkamp dkamp is offline
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Default Re: Brunner A414 compressor

And the last two I have... showing the 'challenged' interstage valve
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  #5  
Old 01-05-2015, 07:00:37 PM
pa93lightning pa93lightning is offline
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Default Re: Brunner A414 compressor

Here's more pictures of the interstage valve. Descovered that I was only missing the disc it that valve and the retainer or valve guide was still in place. Took just a light tape from the back side with a screw driver to remove it.



Heres one of the valve plate cleaned up to show the damage left from the valve disc.


And heres a closeup of the valve guide. You can see how the disc had been bouncing around and wearing into the sides.


---------- Post added at 06:00 PM ---------- Previous post was at 05:53 PM ----------

Heres the parts break down for the a414


And the parts list
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Old 01-06-2015, 05:16:10 PM
john11139 john11139 is offline
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Default Re: Brunner A414 compressor

I have a old Brunner that looks just like yours. The date on the tank is 1959. It has worked every day of its life and still going strong. (in a commercial setting) Along with a couple of old Quinceys, it is my favorite compressor and has given me years of service. I bought it used out of a gas station when they all started closing down in 1976. It had been used hard then. I change the oil about once a year. Doesn't use any oil. It is quieter than most compressors and doesn't shake the building. I think they quit making them years ago.
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