| 摘要 |
A pump that has a cavity (13) in which is located a flexible membrane (14) mounted with a pre-set such that it is bi-stable, in each stable state the membrane conforming to the shape of one of the opposing surfaces of the cavity. An inlet opens into the cavity and is associated with a valve (27). A valve (28) is likewise provided in an outlet (25). Also opening into cavity is a port (22) to which means for applying negative and positive pressures can be connected whereby the flexible membrane can be moved to its two stable states corresponding to completion of inlet and exhaust of a pumping cycle.
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