| 摘要 |
<p>A pump for pumping a fluid is disclosed. The pump comprises an inlet means (3), an outlet means (6), an internal volume disposed between said inlet means (3) and said outlet means (6), first pumping means (12, 30, 45, 48) operable to pump a first volume of fluid from the inlet means (3) into the internal volume, and second pumping means operable to pump a second volume of fluid from the internal volume into the outlet means. 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 means (3).</p> |
