Patent ID: 6926172
Filing Date: 2005-08-09
Classification: B65D

Abstract:
1. A valve assembly that is suitable to dispense a chemical from an aerosol container, the valve assembly being of the type that can automatically release active chemical from the container, the valve assembly comprising: a housing mountable on an aerosol container; a movable diaphragm associated with the housing and linked to a seal, the diaphragm being biased towards a first configuration; an accumulation chamber inside the housing for receiving chemical from the container and providing variable pressure against the diaphragm; a first passageway linking the aerosol container with an outlet of the valve assembly; a second passageway linking the container with the accumulation chamber; whereby when the diaphragm is in the first configuration the seal restricts the flow of the active chemical out of the valve assembly via the passageway; and whereby when the pressure inside the accumulation chamber exceeds a specified threshold the diaphragm can move to a second configuration where active chemical is permitted to spray from the valve assembly; wherein once the diaphragm has moved from the first configuration to the second configuration it will automatically stay out of the first configuration until at least a majority of the active chemical in the container has been released.