Abstract: An air cooling system for an engine driven, multi-stage compressor is provided which includes a fan means for providing a cooling airstream to the air cooling system and an engine radiator. An intercooler has a predetermined height dimension and receives heated, compressed, interstage air. An oil cooler has a predetermined height dimension which is substantially less than the height dimension of the intercooler. An aftercooler receives hot, compressed, final stage air. The intercooler, the oil cooler, the radiator, and the aftercooler are arranged in two banks, each bank comprising two cooling cores juxtaposed one to each other. The intercooler and the engine radiator define the first bank which is positioned substantially adjacent to the fan means to receive the coolest cooling airstream. The oil cooler and the aftercooler define the second bank which receives warmer cooling air which has first passed through the first bank.

Abstract: A portable compressed air system includes a housing, and a diesel engine having a predetermined torsional inertia, a predetermined cranking speed, and a predetermined idle speed. A centrifugal compressor is flexibly coupled in motive force receiving relation to the diesel engine. The flexible coupling has a predetermined spring rate which places the torsional interia of the compressor above a highest predetermined cranking speed and below the predetermined idle speed of the diesel engine. A microprocessor-based electronic controller controls compressor operation. A receiver stores compressed air. A cooling means cools the portable compressed air system. The cooling means has a fan, an intercooler, an oil cooler, an engine radiator, and an aftercooler. The intercooler, the oil cooler, the radiator, and the aftercooler are arranged in two banks, and each bank is defined by two cooling cores juxtaposed one to each other.

Abstract: An apparatus for loading a compressor includes a microprocessor based electronic controller, a pneumatically driven, spring loaded open first valve, and a normally open, electrically driven second valve flow connected in series with the first valve. The first valve and the second valve are fluidly disposed intermediate a receiver tank and the compressor. The second valve is disposed in signal receiving relation to the controller. An orifice and muffler combination is flow connected intermediate the first valve and the second valve. The orifice has a predetermined inside diameter dimension suitably sized to establish a pressure signal to close the first valve to thereby load the compressor.