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Old Compressor

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Ralph

11-23-2000 18:24:52




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I have an old air compressor and am trying to find the proper direction of rotation. The belt pulley on the compressor has fan blades in place of spokes. In general, should the fan pull air across the compressor and through the fan or should it push air from the fan toward the compressor?




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Steve

11-26-2000 13:30:45




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 Re: Old Compressor in reply to Ralph, 11-23-2000 18:24:52  
Most compressors have an arrow stamped on one of the spokes (or in this case one of the blades) to indicate direction of rotation. Sometimes they're hard to see if the pulley is dirty or rusty.



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John in MA

11-25-2000 18:12:44




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 Re: Old Compressor in reply to Ralph, 11-23-2000 18:24:52  
I've never seen a compressor that didn't blow across the cylinder.



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T_Bone

11-25-2000 00:13:28




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 Re: Old Compressor in reply to Ralph, 11-23-2000 18:24:52  
Hi Ralph,The inside cupped part of the blade is the direction of rotation on any fan. Cup your right hand and move it to the left, it cups the air to move it to your plam or the back of the blade. They can be designed to push or pull air and this way will always tell which rotation.

Some fan blades are straight so use the leading edge to tell direction as the wider edge pulls the air while the thiner edge discharges the air.

Still can't tell on some. Hook up the fan and run in both directions. One direction usually produces more air than the other. More air flow is the correct direction.

T_Bone

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ltf in nc

11-24-2000 08:26:54




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 Re: Old Compressor in reply to Ralph, 11-23-2000 18:24:52  
You should be able to tell by the blade angle but all that I have seen push the air across the compressor



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