Abstract: A dosing apparatus includes a feed device for a liquid or pasty medium, which supplies the medium at a given preliminary pressure. A pressure control valve communicates with the feed device, a dosing pump is fluidically connected to the pressure control valve, a driving motor that drives the dosing pump, a discharge valve discharges the medium as a volume flow modifiable over time. A control and regulation device feeds a control signal to the pressure control valve in accordance with a predefined setpoint volume flow value. A comparator of the control and regulation device compares the input and output pressure values, and a control unit modifies the control signal fed to the pressure control valve in order to drive the difference between the input and output pressure values to a given value.

Abstract: A dosing apparatus includes a feed device for a liquid or pasty medium, which supplies the medium at a given preliminary pressure. A pressure control valve communicates with the feed device, a dosing pump, particularly a gear pump, is fluidically connected to the pressure control valve, a driving motor that drives the dosing pump, a discharge valve which communicates with the dosing pump and via which the medium is discharged as a volume flow modifiable over time. A control and regulation device feeds a control signal to the pressure control valve in accordance with a predefined setpoint volume flow value. A first pressure sensor detects the input pressure of the medium upstream from the dosing pump, a second pressure sensor detects the output pressure of the medium downstream from the dosing pump.