Load sensing hydraulic system for e.g. farm tractor, has operating slide whose first end is subjected to pressure at flow restrictor device outlet and pressure of calibration spring, and second end is subjected to pressure at device inlet
Hydrostatic transmission device for mobile machine e.g. tractor, has pressure control valves connected to conduits, where valves connect conduits to high pressure duct when valves are in specific position
Hydrostatic transmission device of a mobile unit, provided with a pressure-control valve and a selector