Patent ID: 6076711
Filing Date: 2000-06-20
Classification: B05C

Abstract:
A material dispensing valve assembly, comprising:a housing having a longitudinal axis;a die orifice defined within a first axial end of said housing and through which a material is able to be dispensed;first passageway means defined within said housing for conducting the material to be dispensed to said die orifice;a valve seat operatively associated with said die orifice;a valve member operatively associated with said valve seat for movement between OPENED and CLOSED positions with respect to said valve seat;a piston rod for supporting said valve member upon a first axial end portion thereof;first and second cylinder chambers defined within axially central and second axial end portions of said housing;first and second pistons mounted upon axially central and second axial end portions of said piston rod and respectively disposed within said first and second cylinder chambers so as to define with said piston rod and said first and second cylinder chambers a dual-piston multiplier assembly;a first OPEN air passageway defined within said housing for transmitting OPEN air into said first cylinder chamber for acting upon a first surface portion of said first piston, and a second OPEN air passageway defined within said housing and disposed externally of said piston rod for transmitting OPEN air from said first cylinder chamber into said second cylinder chamber for acting upon a first surface portion of said second piston in order to simultaneously move said first and second pistons in a first direction so as to lift said valve member from said valve seat and OPEN said valve assembly so as to permit dispensing of the material from said die orifice; andCLOSE air passageway means defined within said housing for transmitting CLOSE air to second surface portions of said first and second pistons in order to simultaneously move said first and second pistons in a second direction so as to move said valve member toward said valve seat and CLOSE said valve assembly so as to terminate dispensing of the material from said die orifice.