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Old 02-22-2011, 08:43 PM
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That brass fitting in the top of the tank is a check valve, so air can only go into the tank, and the small line is an unloader that connects between the pump and the check valve so it doesn't have to start against the tank pressure. I'm actually surprised that it's necessary, I would expect that the volume between the pump and the check valve is small enough and the pump would leak enough that after a few seconds there wouldn't be significant pressure there...

Along these lines, I've always wondered if there is any way to tell which way the compressor should turn without a pulley on it? I have a big old Kelogg compressor head that I intend to setup at some point but I have no idea what direction it needs to turn.
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