The most used hydraulic cylinders have a moveable piston rod on only one side. Therefore there is a different relevant surface on the piston for the advancing and retracting movements of the hydraulic cylinder. The whole surface of the piston is used for the advancing movement unlike the retracting movement where only the surface of the ring face is available which is the summary from the piston surface minus the concealed surface from the piston rod. The piston surface in relation to the ring face is called Φ (Phi). Due to the relation between the piston surface and the ring face the forces from a differential hydraulic cylinder which is generating the same pressure on the piston – and the cylinder rod side, are completely different. The forces are much higher in the retracting than in the advancing movement. Common surface ratios are: Φ:1,4 Φ:1,6 Φ:2,0. If the initiated flow rate is consistent, there is a various movement speed of the differential hydraulic cylinder due to the ratio from the cylinder capacity on the piston- and cylinder rod side to the base area. In the case with the differential hydraulic cylinder it is inversely proportional. This means: the cylinder is advancing much faster than retracting due to the surface ratio.