Patent ID: 8485802

Claim:
A pump for generating at least two volume streams with different pressure, comprising a pump cover, a pump housing, and a planetary gear system that is eccentrically located within the housing, the planetary gear system having an inner rotor and a plurality of outer rotors in communication with the inner rotor, each of said outer rotors being disposed in a respective bore hole defined by a bearing ring, the pump housing having a suction slit and a pressure slit, which the suction slit and the pressure slit are separated from each other by an initial sealing web and a diametrically opposed second sealing web, the pressure slit is divided into a high pressure chamber and a low pressure chamber by at least one additional sealing web, and each of said high pressure chamber and low pressure chamber having a pressure port, wherein (i) the high pressure chamber is adapted to provide a first volume stream for use external to the pump and the low pressure chamber is adapted to provide a second volume stream for use external to the pump, (ii) the high pressure chamber is adapted to provide a higher pressure than the low pressure chamber, and (iii) the size of the high pressure chamber and the low pressure chamber is variable.