Whatever is behind the pump
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I would like to ask everyone: what is that in the ring connected after the pump, and what is its function? It’s not indicated in the legend either
It might be a pressure stabilizing tank; the pressure at the outlet of the positive displacement pump fluctuates, and a pressure stabilizing tank can reduce these fluctuations.
Try understanding it as an accumulator for now, since the subsequent process is not clear. For reference.
Reciprocating pump, with pulses and a buffer tank for buffering
The presence of bypass valves and safety valves indicates that it is not a centrifugal pump; these are standard features of positive displacement pumps, and it should belong to the category of dampers
Dampers, used for stabilizing pressure and reducing pulses, generally used in diaphragm pumps or reciprocating pumps