The core of the Floating Cup principle is the shaft on which the rotor plate is fixed. The pistons are locked onto the rotor: there is no movable joint between the pistons and the rotor. The pistons are double faced. Unlike conventional axial pistons machines the pistons are not running in a collective cylinder block or barrel. Instead each piston has its own cup-like cylinder. The cylinders are supported by means of a barrel, one on each side of the rotor.
To create a positive displacement the barrel plates have to be maneuvered in an angular position. This makes the cylinders move up and down over the pistons.