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Dominic: When a compressor shuts off after cycling, there must be a way for the pressure between the exhaust valve of the compressor and the tank check valve to be released. This can be accomplised in several ways, but most often on Kelloggs, there is a small copper line exiting the cylinder head, or near vicinity of the high pressure exhaust valve, leading to a cone-shaped protuberance on the back side of the compressor. Inside this cone shaped case, there is a flyweight arrangement, kind of like those old spinning ball steam governors. When the compressor runs, the flyweights move outwards under centrifugal force, This allows a plunger to recede into the case, which closes a small valve. This valve is the one that blows down the compressor on shutdown. When the compressor shuts off, the flyweights retract under spring pressure, the plunger extends outwards, and the small valve is forced open. This vents the air trapped between the discharge of the compressor, and the intank check valve. This is to ensure that the compressor will not be trying to start against full tank pressure, which results in hard starting, excessive amp draw, and most likely, blown breakers. After each cycle, you should hear a short blast of air from your compressor. This lets you know that it is fuctioning normally. If this is not ocurring, you may have to remove the copper line, and turn the brass fitting in a few turns to get the proper clearance for the valve pin. Congrats on your purchase. They were fine compressors.
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