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The feature is a point shapefile that has three subtypes to classify data; duplex, simplex and progressive cavity. Simplex is a single piston reciprocating device that displaces fluids on both stroke cycles. In other words, the cylinder is filled with fluid above and below the piston, and pumps on both the up and down stroke. Simplex pumps may be powered by electric, gasoline, or diesel motors or by compressed air. Duplexconsists of two pumps that alternate the pumping process, thereby allowing it to be more efficient than a single version. This pump has a higher flow rate due to its not having a dead spot in the pump stroke. A progressive cavity is a type of positive displacement pump that transfers fluid by means of the progress, through the pump, of a sequence of small, fixed shape, discrete cavities, as its rotor is turned. |