The invention relates to a pumping system (2) for a fuel dispensing unit (1), comprising a first pumping unit (3) configured to suck fuel from a fuel storage tank and comprising a first air separator for circulating a part of the fuel with low rate of gas toward a first fuel supply line (15) and to evacuate a gas-enriched part of the fuel toward a first recovery chamber (18), a second pumping unit (4) configured to suck fuel from the fuel storage tank and comprising a second air separator for circulating a part of the fuel with low rate of gas toward a second fuel supply line (16) and to evacuate a gas-enriched part of the fuel toward a second recovery chamber (19), and a manifold (8) comprising a fuel inlet (34) connected to the fuel storage tank, a first fuel outlet (35) connected to a first supply inlet of the first pumping unit (3), and a second fuel outlet (36) connected to a second supply inlet (38) of the second pumping unit (4). The invention also relates to a fuel dispensing unit (1) for refueling vehicles.

An electric oil pump includes a base portion, a pump portion, a power supply, a mechanical switch and a pressure trigger. The base portion has a fluid passage. The pump portion is disposed on the base portion. The power supply is provided with an electric power to the pump portion. The mechanical switch is electrically connected the pump portion and the power supply, and has a pressing member. When the pressing member is not pressed, the mechanical switch is in a conductive state, and when the pressing member is pressed, the mechanical switch is in a non-conductive state. The pressure trigger is located between the mechanical switch and the fluid passage, capable of pressing the pressing member when the pressure in the fluid passage is above an upper threshold and releasing the pressing of the pressing member when the pressure in the fluid passage is below a lower threshold.

An electric oil pump includes a base portion, a pump portion, a power supply, a mechanical switch and a pressure trigger. The base portion has a fluid passage. The pump portion is disposed on the base portion. The power supply is provided with an electric power to the pump portion. The mechanical switch is electrically connected the pump portion and the power supply, and has a pressing member. When the pressing member is not pressed, the mechanical switch is in a conductive state, and when the pressing member is pressed, the mechanical switch is in a non-conductive state. The pressure trigger is located between the mechanical switch and the fluid passage, capable of pressing the pressing member when the pressure in the fluid passage is above an upper threshold and releasing the pressing of the pressing member when the pressure in the fluid passage is below a lower threshold.

A system for circulating a liquid which comprises at least one pump, connectable to at least one pipe for the flow of a liquid and driven by at least one electric motor; sensors being provide for sensing at least two electrical parameters correlated with the operation of the electric motor and a processor which is functionally connected to the sensors and configured to determine, based on the signals provided by the sensors, at least one fluid-dynamic parameter correlated with the flow of the liquid through the pipe.

A system for circulating a liquid which comprises at least one pump, connectable to at least one pipe for the flow of a liquid and driven by at least one electric motor; sensors being provide for sensing at least two electrical parameters correlated with the operation of the electric motor and a processor which is functionally connected to the sensors and configured to determine, based on the signals provided by the sensors, at least one fluid-dynamic parameter correlated with the flow of the liquid through the pipe.

A dispenser system, including a first shaft and a second shaft, a first gear system disposed on the first shaft, the first gear system including a first gear, a second gear, a first pump roller configured to dispense a first formula, and a second pump roller configured to dispense a second formula, and a second gear system disposed on the second shaft, the second gear system including a third gear, a fourth gear, and a synchronizer configured to slide between the third gear and the fourth gear, and a motor configured to rotate the first shaft and the second shaft, wherein the motor is configured to control both the first pump roller and the second pump roller.

A dispenser system, including a first shaft and a second shaft, a first gear system disposed on the first shaft, the first gear system including a first gear, a second gear, a first pump roller configured to dispense a first formula, and a second pump roller configured to dispense a second formula, and a second gear system disposed on the second shaft, the second gear system including a third gear, a fourth gear, and a synchronizer configured to slide between the third gear and the fourth gear, and a motor configured to rotate the first shaft and the second shaft, wherein the motor is configured to control both the first pump roller and the second pump roller.