Metered aerosol valve for use in inverted position

Claim 1

A valve for being mounted in the opening of a pressurized container, for being filled up with a liquid material to be atomized, containing a propellant miscible gas solved under pressure in said liquid material, and for expelling precise metered amounts of material when the container is maintained in inverted position with the opening downwards, comprising a valve body (1) of tubulr form, said body forming at its upper part, when the container is in upright resting non inverted position, a metering chamber (13) adjacent to the container opening, limited by a generally cylindrical wall (23,26), two radial walls formed by a first upper annular gasket (3) with a central opening and a second lower annular gasket (12) with a central opening (31), and a valve stem (4) extending through gasket openings and including an upper extension (5) extending out of the valve, said stem comprising between gasket (3) and gasket (12) a bulge (11) provided for closing opening (31) by downward movements, said stem (4) extending downwards by comprising a slender part (14) passing through opening (31) when the valve is at rest, and a guiding shank (16), the upper outer part (5) of stem (4) comprising an axial canal (6) externally communicating through a passage (7) located outside of the valve when said valve is at rest and inside of the valve when the stem is displaced downwardly, said valve body forming at its lower part a tubular housing (30) with a bottom (21) for receiving a return spring finding its upper abutment against a shoulder (15) of the stem and its lower abutment against bottom (21), wherein the slender part (14) of stem (4) is formed with ribs (17), and housing (30) is formed with a longitudinal opening (19), the number of openings (19) being different from the number of ribs (17).