In hydraulic systems oil transfers power and motion, and in drives it’s a vital lubricant. Both as a power transfer medium and as a lubricant, oil is heated by friction losses during operation and changes its viscosity depending on the temperature. At the same time it is subjected to mechanical strain due to the tribological processes in the systems and takes on wear particles this causes. If these particles aren’t removed as quickly as possible, they will cause further abrasion and wear. Hydraulic and lubrication systems therefore increasingly use bypass filters with built-in cooler. The advantage of these circuits is that they create stable and therefore more predictable operating conditions for both the filtration and cooling. The BKF series has compact gerotor pump/filter/water cooler combinations with different capacities, including custom. These compact units are combined with the extremely efficient BWT series late heat exchangers. The filter housings are suitable for DIN 24550 filter elements.