Progressive systems consist of a pump connected to at least one primary metering device. If needed, second-level metering devices can be connected to the outlets of the primary metering device to increase the number of lubricated points, depending on the operating pressure of the pump. The outlets of the primary and second-level metering devices are connected via branch lines to the lubrication points of the machine. The pump supplies lubricant to the metering devices with a pressure of up to 550 bar (8000 psi), depending on the pump model. The metering devices split the lubricant into even or predefined amounts of lubricant, depending on the metering device, that are positively displaced to the lubrication points or the inlet of a connected secondary metering device The lubricant amount provided by each outlet of the metering device depends on the type of metering device being used.