Azaran Bojar Iran Company, as the most experienced manufacturer of gravity machines with a capacity of 5 tons in Iran, after years of experience in this field began to design a new generation of gravity machines. In the process of making gravity machines, most of its parts are connected to each other by bolts and nuts, which increases the build quality and longevity of the machine. Also, due to the importance accurate and rapid adjustment of wind speed on the table surface of the gravity machine, Azran Bojar Iranian company was able to significantly influence the efficiency of the fans, reduce the noise and increase the accuracy and speed of wind adjustment by designing diaphragm valves similar to those found in modern European devices today .Another innovation of the company is the creation of a lattice structure under the gravity table which also leads to uniform distribution of the winds at the surface of the table. Returned seeds are the seeds that seed producers must re-sort, which requires time and cost. In the new model of gravity separator by designing a new outlet for wastes and returned seeds, the user can direct the returned seeds directly to the main seeds if it achieve good quality, which greatly affects the increase in production capacity and the reduction of amount of rework and increase the quality of seed production.