Apparatus for proportioning or for proportioning and mixing plural different fluid compositions

摘要

An apparatus for proportioning and dispensing at least two different fluid compositions having different degrees of compressibility includes a cartridge having therein plural separate chambers for containing separate fluid compositions to be proportioned and dispensed. A neck portion is provided at a discharging end of the cartridge. Plural separate passageways extend through the neck portion, each passageway opening into a separate respective chamber. Structure is provided for controlling the flow of the fluid compositions through the respective passageways, for preventing run-on of the fluid compositions through the respective passageways due to decompression of the fluid compositions upon removal of an extruding pressure, and thereby for preventing dispensing of the fluid compositions through the respective passageways in proportional ratios other than a desired predetermined proportional ratio. Such structure includes a valve member having therethrough plural passage portions. The valve member is mounted within the neck portion for movement with respect thereto between an open position, whereat the passage portions are aligned with respective ones of the passageways, thereby permitting extrusion through the passageways of the fluid compositions, and a closed position, whereat the passage portions are out of alignment with the respective passageways and the passageways are blocked by the valve member, thereby preventing any passage of the fluid compositions through the passageways.