| 摘要 |
A liquid dispensing pump is disclosed and is powerable by pressurized fluid intermittently applied to the pump, the pump has a pumping chamber, a pressurizing chamber, a movable member for transferring pressure to the pumping chamber, a fluid conduit to the pressurizing chamber for applying pressure to the pump, a valve in the conduit for preventing reverse flow of fluid and an open drain in fluid communication with the pressurizing chamber; any fluid used to power the pump is exhausted out of the drain both during and after pumping.
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