Patent ID: 8608461
Filing Date: 2013-12-17
Classification: F04B

Abstract:
1. A pump for pumping a fluid, the pump comprising: an inlet; an outlet; an internal volume disposed between said inlet and said outlet; a first pumping arrangement operable to pump a first volume of fluid from the inlet into the internal volume, the first pumping arrangement elevating the pressure of the fluid to a level above the pressure of the fluid at the inlet; and a second pumping arrangement operable to pump a second volume of fluid from the internal volume into the outlet, the second pumping arrangement elevating the pressure of the fluid to a level above that of the first pumping arrangement; wherein, in a first mode of operation of the pump, the first volume of fluid is greater than the second volume of fluid such that, in use, the pressure of the fluid within the internal volume is elevated to a level above the pressure of the fluid at the inlet.