Apparatus for dispensing liquid in aerosol spray form

Apparatus for dispensing liquid from a container comprising a piston slidable in a cylinder to vary the volume of a chamber defined therein, a tubular stem integral with the piston and extending outwardly of the chamber to define a liquid delivery duct, a valve member slidably received in the stem and co-operable therewith in a rest position to close the delivery duct, the valve member comprising a core extending within a separately formed cylindrical extension, said cylindrical extension defining an inner wall of the chamber and having an outer periphery in continuous sliding contact with and under radial compression from an internal surface of a tubular extension of the cylinder, the cylindrical extension defining a conduit communicating in use with the container, a spring extending through the conduit and only acting on a stop formation on an external surface of the core of the valve member to bias the valve member into the rest position, and connecting means providing lost motion between the valve member and the cylindrical extension whereby the valve member and the cylindrical extension are movable into and out of engagement to respectively close and open a liquid inlet port defined therebetween and communicating between the conduit and the chamber, wherein the connecting means comprises the stop formation on the core and a co-operating stop formation on an internal surface of the cylindrical extension and wherein the spring extends into an annular space between the core and the cylindrical extension.