Back to Putzmeister Technology Pumps Cells Free Flow Hydraulics S-Valve Hopper Backup Systems OneTouch™ Econo-Gear Technology: Free Flow Hydraulics Our pumps feature an exclusive free flow hydraulic system that performs to higher standards at lower cost than other pumps. Its valve-less intelligent monitoring system takes oil into drive cylinders without any loss of pressure. This enhances the pump’s service life while increasing power and convenience. Video Demonstration You will need QuickTime to view these examples. Click here to download.