seed and grain cleaning fluidized bed dryer flash dryer SEED AND GRAIN CLEANING The Oliver Hi-Cap, Master and Maxi-Cap Gravity Separators are used on any type or variety of seed and grain cleaning process, low germination light seeds, brokens, mechanical damage, insect damage or foreign material. To meet the grower's expectations of high performance seed the modern seedsman must provide product that has been conditioned over a gravity separator.  Oliver Manufacturing is the internationally recognized leader in its ability to solve seed and grain cleaning problems with proven fluidized bed technology.  Oliver designs and manufacturers a complete line of gravity separators, stoners and fluidized bed dryers.