Air compressor driven directly by the motor of the compressor, so that the crankshaft rotational motion of the piston rod driven reciprocating motion, causing the cylinder volume change. Due to changes in pressure within the cylinder by the air intake valve through the air filter (silencer) into the cylinder during the compression stroke, since the cylinder volume is reduced, the role of compressed air through the exhaust valve, through the exhaust pipe, a single the valve (check valve) into the tank, when the discharge pressure reaches the rated pressure 0.7MPa controlled by a pressure switch and automatic shutdown. When the tank pressure dropped 0.5--0.6MPa pressure switch automatically joins start.