The expansion valve was the very first Danfoss product, which Danfoss founder Mads Clausen developed in the early 1930s. The product was launched onto the market in 1933, and, today, the fifth generation of the valve is sold around the globe – helping to keep food fresh. PR has been a proud supplier of Danfoss products over the last 40 years, stocking a wide range of products for the refrigeration and air conditioning industry including, compressors, pressure switches, TEV's, solenoid valves, and countless amounts of filter driers.