Rexroth Rexroth vane type pump units belong to limit pressure variable vane pump with pressure adjusting device and flow adjustment device. Output flow of the pump can be adjusted automatically according to load changes, so that the output power and load operating speed and load size fit, with high efficiency, energy saving, safe, reliable, price and other characteristics, especially for the hydraulic system for the volume of the governor of the power source, such as metal cutting machine tools, pressure machinery, leather machinery, hydraulic station. Variable vane pump unit has a pressure regulator and flow regulating device, when the system pressure is higher than the adjusted set pressure vane pump flow is reduced, the power loss is reduced to a minimum, efficient, safe and reliable, side hydraulic balance, get more good volumetric efficiency, the use of several kinds of noise vibration isolation mechanism, low noise, no vibration