Patent ID: 8070077
Filing Date: 2011-12-06
Classification: B05B,B05C

Abstract:
1. An apparatus for dispensing liquid material to a substrate comprising: a housing having a bore and an inlet for supplying liquid material from a material source to the bore, a nozzle coupled to the housing and communicating with the inlet, the nozzle having a discharge opening for dispensing the liquid material, a movable plunger including an outer periphery, an axial center located radially inwardly from the outer periphery, a valve element, and at least one slot extending from the outer periphery to the center of the plunger, the plunger being mounted for reciprocal movement between a closed and an open position, wherein in the open position, liquid material is dispensed from the discharge opening and in the closed position, the valve element blocks liquid material from being dispensed from the discharge opening, and an actuator for moving the plunger between the closed position and the open position, wherein the at least one slot in the plunger dissipates electromagnetic eddy currents formed by operation of the actuator.