A control system is disclosed for an agricultural implement, such as an agricultural sprayer, used to dispense a product to the ground wherein the dispensing units for the product are provided with control valves that can reduce the flow rate of product through selected dispensing units to zero. A process for accelerating blast media is disclosed. The drive disc is mounted on a drive shaft and positioned between the coupled chamber halves. Each of the first terminals is respectively disposed in the electrical insulation case, and each of the first terminals respectively includes a contact end located in the slot. An object type link table links together records in the primary metadata table, and a content data link table links together records in the primary content data table.