Importance

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Abstract

A spray dispenser for a liquid to be sprayed has a container provided with an inlet valve adapted for connection to a source of pressurized driving gas for pressurizing a head space above the liquid in the container. A spray head including a spray nozzle is mounted to the container and connects through a dispensing valve to a dip tube extending to the vicinity of the container bottom, such that opening of the dispensing valve causes pressurized discharge of the liquid through the spray nozzle. A mixing chamber is provided between the dip tube and the dispensing valve, which mixing chamber communicates with the head space by means of one or more spring loaded valves which admit propellant gas from the head space into the mixing chamber so long as the head space pressure exceeds a minimum preset level sufficient to ensure adequate dispersion or misting of the spray discharge thereby warning the user of the need to replenish the propellant by a clear transition between a satisfactory discharge spray and an inadequate coalesced liquid discharge.

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First Claim