The new drive concept CLH (Closed-loop Hydraulics) is an innovation in hydraulic press construction. The principle is based on variable-speed piston pumps operating in the closed oil circulation system in a four-quadrant mode. The speed is controlled precisely and highly dynamically via water-cooled servomotors. By means of additional auxiliary cylinders, the pendulum capacity of the differential cylinders is taken up, meaning the oil tank can be omitted almost completely. Surface changeover between rapid and working speed enables a ratio of up to 1:10 of the cylinder speed.