| 摘要 |
A pump that has a cavity (13) in which is located a non-elastomeric membrane (14). An inlet (24) opens into the cavity (13) and is associated with a valve (27). A valve (28) is likewise provided in an outlet (25). Also opening into cavity (13) is a port (22) to which means for applying negative and positive pressures can be connected whereby the membrane (14) can be moved between its two stable states corresponding to completion of inlet and exhaust of a pumping cycle.
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