Valve for an aerosol can having a seated valve that remains closed during an underpressure condition of the can

摘要

A valve has a body fixed to an aerosol can which projects towards the interior of the can. An actuating rod is provided accessible from the exterior of the can, and adapted to be displaced by the action of a user in order to open the valve. The valve is combined with a seated valve adapted to be located in the interior of the can. The seat valve has a moveable closure element subjected to the action of a calibrated spring in such a manner that when the pressure in the can falls below a predetermined limit, the seated valve remains closed and prevents spraying even if the valve rod is actuated. The seated valve only opens for a pressure in the interior of the container at least equal to the above mentioned predetermined limit.