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Tool Talk Discussion Forum

compressor curiosity

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lloyd

06-04-2005 18:37:53




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I just 'inherited' a 10hp 2stage air compressor (binks compressor, 'champion' tank, etc) to rescue; it has sclerosis of the valves from it's last job, where it was run without an air filter (in a sawmill!). While cleaning the gunk out & tracing the flow thru the unit, I discovered that the input/low pressure cylinder is smaller than the high pressure/output cylinder. This seems unnatural; certainly it's backwards from the steam world, where the cylinder diameter increases as the pressure lowers (in compound engines). Can anyone explain the physics of why it's different in a compressor?

Similarly, the inlet pipe is 3/4" NPT, the outlet is 1" NPT. Isn't this backwards too?

Thanks all

ldw

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XXX

06-04-2005 20:44:32




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 Re: compressor curiosity in reply to lloyd, 06-04-2005 18:37:53  
It's not different in a compressor. The LP cylinder is the big one, and the HP cylinder is the small one. Every Binks compressor I have seen has had a Quincy pump on it, and yours is probably one of them. Sounds like somebody who didn't know what they were doing rebuilt it and put the pistons and block on backwards. The small cylinder should be closest to the flywheel, and the larger one should be out back. The intake filter should be facing you, with the flywheel on your left. It is normal that the outlet is 1" NPT and the inlet is 3/4" NPT. A 3/4" NPT air filter inlet allows for some pretty robust air filters, whereas a 1" NPT outlet allows for greater flexibility when piping in the compressor.

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