FIELD: engines and pumps.
SUBSTANCE: system includes a diaphragm pump comprising of a suction port and a discharge port, a urea suction line communicating the urea source to the suction port through a liquid connection, and a urea discharge line in fluid communication with the discharge port. The recirculation line connects the liquid connection to the urea discharge line with the urea suction line and contains a flow controller operatively connected to it. The controller is capable of interpreting the state of loss of filling of the diaphragm pump and issuing a command to the flow controller in response to the state of loss of the fill, provides recirculation from the pump inlet port to the urea tank, ensuring a repeated filling of the pump.
EFFECT: improvement of the diaphragm pump system.
22 cl, 3 dwg
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