Dosierventil und Verfahren zum Dosieren von Flüssigkeiten

摘要

The present invention relates to a nozzle assembly for dosing liquid while preventing spillage or dripping between the dosing. Said nozzle assembly comprises a dosing chamber (4) comprising an inlet (21), a piston housing wherein a piston plunger (5) is disposed the displacement of which enlarges or decreases the volume of the dosing chamber (4) corresponding to the volume of a dose, and an outlet (22) communicating with a distribution channel (10), a first one-way valve to open the inlet (21) when the dosing chamber (4) is being filled and to close the inlet (21) when a dose is being emptied out from the dosing chamber (4) into the distribution channel. The nozzle assembly further more comprises a second one-way valve (3) to close the outlet (22) when the dosing chamber (4) is being filled and to open the outlet (22) when a dose is being emptied from the dosing chamber (4) into the distribution channel (10) , and a pressure release valve (23) to open a distribution channel outlet (27) when pressurised to a desired pressure, said pressure release valve (23) comprising a elastic cover (19) tightly fitted around the distribution channel outlet (27) only allowing passage of liquid upon reaching of the desired pressure in the distribution channel (10) to distribution means comprising one or more needles (13) through which the liquid is dosed. The invention also relates to a process for dosing of a liquid while preventing dripping between the doses.