The Water Pump shown in this video is a Hydraulic Pump that works according to the Venturi principle. Science Project.
When a fluid moves quickly its pressure decreases, so when the water jet is injected into the outlet pipe it creates a region of low pressure that drags water through the inlet pipe.
This type of water pump is especially suitable in situations where a centrifugal pump cannot be used because the liquid contains solid matter and it is also not possible to extract the liquid by gravity as it is located in a lower place on the ground.
It allows dragging water containing silt, sand, mud or sewage, and is therefore very useful for cleaning boxes and hydraulic tanks containing dirt.
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