Gas pressure operated dispensing container

摘要

There is disclosed herein a gas pressure operated dispensing container for viscous liquids in which a collapsible compartment containing the liquid is mounted inside a pressurized canister and has an end closure fitted with a dispensing valve having a elastomeric valve seal inside the compartment. A rigid reinforcing ring frictionally engages the end closure and prevents collapse of the top portion of the collapsible compartment. The ring has one or more air passages extending from a point on its internal periphery below the area of engagement with the end closure to the top thereof. The air passages are, for example, longitudinal notches in the ring spaced around its circumference and serve to allow air to pass out of the compartment as the end closure is applied.