| 摘要 |
A pump with a plunger assembly that is received within an outer housing containing a fluid. The plunger assembly includes a slidable sleeve portion defining a vertical channel. A pair of flexible membranes form outer and inner chambers within the vertical channel, one of the flexible membranes constituting a common wall that separates the chambers. A charging fluid is fed to the outer chamber through an inlet valve and exits therefrom through an exhaust valve. A fluid to be pumped is fed to the inner chamber through an inlet valve and exits therefrom through an exhaust valve. The charging fluid governs the interior profile within the vertical channel for providing variable pressure to volume ratios within the chambers.
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