The vertical arrangement of the running gear and the star-arrangement of the cylinders are
particularly noteworthy features of the family design. The design principles have been adopted from the water-cooled Navy compressor that is used in submarines,frigates and aircraft carriers. It is distinguished by the very small amount of space required,
and for the extremely low values for vibration and sound due to an almost perfect balancing of the free inertial forces.
For the WP 4331 to WP 4351,
The direct drive, pressure-lubrication and slide bearing of the crankshaft, together with the
beneficial design and robustness adopted from the practice-proven
Sauer high-pressure compressors, ensure exceptionally reliable and low-maintenance
operation with maintenance intervals that are far longer than those of the competition.