Patent ID: 8444027

Claim:
A one way valve assembly for dispensing a flowable substance comprising: a source for the flowable substance having an opening; a valve assembly connected to the opening from the source for receiving the flowable substance from said source and for dispensing the flowable substance, said valve assembly comprising: an axially extending inner core having an inlet opening for receiving the flowable substance from said source, an axially extending flexible membrane tightly fitted over an outer surface of said inner core, said inner core having an axially extending passageway in communication with said source for receiving the flowable substance from said source, at least one port opening from said passageway to an inner surface of said flexible membrane for expanding said membrane outwardly from said outer surface of said inner core; an axially extending cover enclosing and spaced laterally outwardly from an outer surface of said flexible membrane, said cover having an outlet orifice at an end of said inner core for dispensing the flowable substance from the valve assembly; wherein: when pressure is applied to the source said flowable substance flows from the source into the passageway in said inner core and out of said at least one port, thus expanding said flexible membrane, and between said outer surface of said core and said inner surface of said flexible membrane into said outlet orifice, and when the pressure on said source is released said flexible membrane moves back into tightly fitting contact with the outer surface of said inner core, and wherein said flexible membrane has a variable wall thickness and becomes thicker at the axial end of said membrane adjacent said outlet orifice.