| 摘要 |
<p>A pumping system for positive displacement, volumetric liquid control includes a pump (2, 4, 6) having a pumping chamber (52) with a pumping chamber inlet (54) and a pumping chamber outlet (56). The pumping system further includes a liquid supply inlet (46) for receiving liquid from a liquid supply (8, 10, 12), and a detector (69) for detecting air in liquid flowing through the liquid path. A liquid valve actuator (58) regulates liquid flow through the liquid supply inlet and a second valve actuator (60) regulates liquid flow through the pumping system outlet. A controller (94) is responsive to an output from the detector (69) to control the pump (2, 4, 6) the first valve actuator (58) and the second valve actuator (60) such that liquid is directed through the liquid supply inlet (46) and the pumping system outlet (66) during an initial priming sequence until the quantity of air in liquid at the pumping system outlet (66) corresponds to a predetermined value.</p> |
