Supermarket refrigeration systems, rooftop chillers, walk-in fast food restaurant freezers and refrigerated rail cars vary greatly in size and appearance. Yet they all share the same principles of refrigeration. In each system, pressure sensors are vital in controlling the refrigeration cycle and keeping the system efficient. The basic refrigeration cycle is a four step process. To learn more, go to the Kavlico website news & events section and click on what's new at Kavlico to download a PDF file of the entire article.