AEROSOL CONTAINER WITH FLAMELESS DELIVERY VALVE

摘要

: An aerosol container and valve system are provided, especially intended for use with compositions containing liquefied flammable propellants, the valve system having a delivery valve that is capable of delivering a spray that is either flameless or at worst has an abnormally Low flame extension, whether the container is in an upright position or in a fully inverted position, comprising, in combination, a pressurizable container having at least one storage compartment for a liquid aerosol composition and a liquefied propellant; a delivery valve movable manually between open and closed positions, and including a valve stem, a valve stem orifice, a valve stem passage, and a delivery port; a mixing chamber in flow connection with the storage compartment for reception therefrom and mixing together liquid aerosol composition and propellant in gas form; an aerosol-conveying passage including a valve stem passage in flow connection at one end with the mixing chamber and at the other end with the delivery port, manipulation of the delivery valve opening and closing the passage to flow of aerosol composition and propellant from the storage compartment to the mixing chamber and delivery port; and at least two flow constrictions disposed across the passage in the line of flow from the mixing chamber to the valve stem orifice, each constriction having an open area within the range from about 0. 05 to about 0.4 mm2, and at least two expansion chambers, one following each constriction, each having an open area at least 25% greater than that of the preceding constriction, thereby reducing the flammability of the delivered spray.