| 摘要 |
An apparatus and method for pumping from a well. A pump includes a piston assembly reciprocably engaged in a cylinder assembly. Pressure applied to a column of fluid above the pump causes a pump chamber to fill with fluid. A spring mechanism coupled to an anchor point above the piston assembly provides upward force on the piston assembly. Alternate cycles of the application and release of pressure result in the pumping of a fluid.
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