Easy and open economy is the main features of the process. Of course, in the open system, it can also be powered with water or other liquid solution, but due to the addition of chemical additives (lubricating, corrosion, oxygen) to be mixed with the liquid recovery recovery generally wear and tear off,
automatic fuel dispenser ，it must be added continuously.
Ground gathering process closed power fluid system, as power is relatively small tank, this system is more suitable for oil wells lake,
mechanical fuel level gauge ，sea pumping wells and densely populated areas.
For example, in California, USA, as many oil wells located in the town and the sea, and therefore widely used in closed systems.
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