Patent ID: 6061225
Filing Date: 2000-05-09
Classification: H01F,H01H

Abstract:
A solenoid operated liquid dispensing device, comprising:a valve having a moveable plunger operative with a dispensing orifice;a solenoid having an electrical coil and a moveable armature connected to said plunger for selectively positioning said plunger relative to said dispensing orifice to control flow of liquid through said orifice; anda bidirectional current source coupled to said solenoid coil for generating opposite magnetic fields in said coil responsive to opposite current flow through said coil;whereby in one direction of current through said solenoid coil, a magnetic field is generated by said coil and said armature is magnetized with a predetermined magnetic polarity for generating a magnetic attraction therebetween to retract and hold said plunger from said orifice to permit liquid flow therethrough, and in an opposite direction of current through said solenoid coil, an opposite magnetic field is generated by said coil and said armature remains at least temporarily with said predetermined magnetic polarity to generate a magnetic repulsion therebetween to force said plunger toward said orifice to prevent liquid flow therethrough.