DOSING MECHANISM FOR PROPORTIONAL DOSING PUMP AND RELATED PUMP AND METHOD OF USE

摘要

The invention relates to a metering mechanism (D), containing a metering element (10), which is installed with the possibility of translational movement in the casing (3), and the casing is installed in the adjusting sleeve (4), which can interact with the casing by means of a screw displacement, and moving the screwing / unscrewing forms a translational movement of the metering element; moreover, at one end of the metering element is provided with a check valve (11), and at the other end in the metering element there is a plunger (9), the reciprocating movement of which forms suction at the end of the element provided with the valve (11), followed by the extrusion into the volume (V) surrounding the other end of the metering element through the passage formed in at least one first sealing device (J91; J1) and in a second sealing device (J93). The invention also relates to a proportional dosing pump comprising a dosing mechanism of the type mentioned, as well as to a method of using the pump of the mentioned type in at least two dosing ranges.