A centralized lubrication system is defined as progressive sequence type when it contains metering valves which carrying out the work of having pistons moving in their seats, they drive another one with an interdependent sequence and deliver a predetermined quantity of lubricant to user whose number corresponds to the number of distribution elements. In other words a flow generator (pump) is placed at the origin of the system; this then is connected to a metering valve working in such a way that it meters and delivers the desired quantity of lubricant to the first user; when this action is fulfilled, the sequence goes on for the second user and so on for the next ones. Each metering valve is put in series with all the others located after or before it. The failure of anyone of the metering valves causes all the others to shut down. In case of external obstruction in the supply lines to the bearing causing a piston to stop, this will obviously shut down the whole system. Lubricant: oils up to 2000cSt/40C and greases up to grade 2 (ASTM).

top | index