Hydraulics is a drive technology that is indispensable in the industrial sector and has to deal with high pressures, temperatures and harsh conditions. Hydraulic systems are drives for excavators, bulldozers, garbage trucks, forklift trucks, (lifting) bridges, locks, dredging and offshore ships, blast furnaces and wind turbines. High quality and maintenance of machines is very important. Leaks and strange noises should absolutely not occur. Hydraulic systems are expensive and must have the longest possible life.