Abstract: The present valve is for use on an aerosol container having a propellant. It has an axially displaceable, tubular valve body with an eduction passageway leading up to an orifice located below an internal dividing wall, and a product discharge passageway leading up from another orifice located above this wall. An upper, annular, elastomeric gasket closes these orifices in the normal position of the valve body. A lower, annular, elastomeric gasket directly below the upper gasket normally closes a separate propellant discharge passageway in the valve in the normal position of the tubular valve body. When the valve body is displaced downward from its normal position, a first annular passageway is formed between the two gaskets to connect the eduction passageway to the product discharge passageway, and a second annular passageway is formed below the lower gasket to open the propellant discharge passageway to pass gaseous propellant from inside the container.

Abstract: A valve for a pressurized aerosol dispenser comprises an axially movable, tubular valve body, a piston attached to the valve body, and an annular elastomeric gasket which encompasses the valve body and overlies the piston to provide an annular chamber therebetween when the valve is open. The valve body includes a cylindrical bore through it blocked by a wall which separates the bore into an education passageway and a discharge passageway. Vertically spaced, inlet and outlet orifices communicate with the education and discharge passageways, respectively, with the inlet orifice located above the outlet orifice. The chamber communicates the orifices with each other when the valve is open. The inner margin of the gasket normally sealingly occludes both orifices to close the valve. The vertical spacing between the orifices provides occlusion of the inlet orifice before the outlet orifice as the valve moves toward closure. Only some parts of the orifices need be vertically spaced.