| 摘要 |
A pneumatic underground fluid recovery pump is disclosed that includes a power actuated inlet valve and a power source, independent of the static fluid pressure head in the well, for actuating the power actuated inlet valve between open and closed positions. Also disclosed is a pneumatic underground fluid recovery pump that includes a fluid level sensor for sensing fluid level in the pump reservoir above a first predetermined level and a controller for controlling the pressurization of the pump in response to the fluid level sensor sensing fluid level above the first predetermined level. Also disclosed is a pneumatic underground fluid recovery pump that includes a fluid level tracking device for sensing underground fluid level in the well and adjusting the level of the pump inlet valve a predetermined distance below the underground fluid level in the well.
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