초록 ▼

A liquid dispensing device is disclosed in which there is a movable needle valve operable to open and close a valve seat located within the nozzle of the dispensing device. The needle valve is guided by a guide bushing contained within the nozzle bore. A very small radiused semi-spherical end surfac

A liquid dispensing device is disclosed in which there is a movable needle valve operable to open and close a valve seat located within the nozzle of the dispensing device. The needle valve is guided by a guide bushing contained within the nozzle bore. A very small radiused semi-spherical end surface on the nozzle has been found to eliminate stringing of viscous liquid materials dispensed from the nozzle, particularly when the end surface is combined with a needle valve which is maintained concentric with the nozzle orifice by the guide bushing contained within the nozzle bore.

대표청구항 ▼

A device for dispensing viscous liquids comprising a nozzle having an axial bore therein, said bore having a frustoconical valve seat formed therein, said frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conically shaped section on t

A device for dispensing viscous liquids comprising a nozzle having an axial bore therein, said bore having a frustoconical valve seat formed therein, said frustoconical valve seat terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conically shaped section on the distal end thereof, said conically shaped distal end section of said needle valve being engageable with said frustoconical valve seat to close said valve, a bushing located within said nozzle, said bushing having a needle valve guide surface formed therein, said needle valve guide surface being engageable with said needle valve at a location spaced from said valve seat so as to guide movement of said needle valve along a longitudinal axis concentric to said valve seat, passageway means for supplying liquid to said nozzle bore forwardly of said bushing, and means for minimizing stringing of the viscous liquids from the nozzle orifice after closing of the needle valve on the valve seat, said means including a tip on said nozzle having an exterior surface which tapers inwardly toward said nozzle orifice, said tip terminating in a semi-spherical end surface, and said nozzle orifice being located in said semi-spherical end surface so that there is no cavity between the distal end of said needle valve and said nozzle orifice.