A Refrigeration Compressor is an essential part of what makes refrigeration technology work. A compressor is like a small motor it consists of a piston, a crank shaft, and a connecting rod that connects the piston to the crankshaft. Similar to the engine in a car, a compressor produces compression over its stroke as it is operated. As the name suggests, the Refrigeration Compressor works to compress the refrigerant gas, using mechanical or other force to raise its temperature and pressure levels.