Patent ID: 6119952
Filing Date: 2000-09-19
Classification: F01L,F02M

Abstract:
A dosing device for fluid, comprising:a housing having a primary side and secondary side, said housing having a hydraulic chamber therein communicating with a borehole in said secondary side of said housing, said borehole terminating in a mouth communicating with an exterior of said housing;an axial moveable lifting element having a sealing element disposed at said mouth, said lifting element being disposed in said borehole in said secondary side with a leakage-permitting fit;a fluid chamber in communication with said borehole containing a fluid to be dispensed in a dose through said mouth;a primary drive hydraulically operable on said lifting element via said hydraulic chamber to move said lifting element in a first direction to open said mouth by moving said sealing element away therefrom to allow said fluid to exit from said fluid chamber through said mouth; andsaid leakage-permitting fit causing said sealing element to remain away from said mouth for a predetermined time to control said dose of fluid, and thereafter causing said lifting element to move in a second direction, opposite said first direction to close said mouth to terminate said dose.