| 摘要 |
There is provided a discharge assembly apparatus 101 for discharging a metered volume of a liquid when used in combination with a liquid-containing, pressurised or pressurisable container 102, preferably an aerosol container. The discharge assembly apparatus 101 has an actuator assembly incorporating a valve stem 104 adapted for movement from a first limit position to a second limit position. The valve stem 104 has a discharge conduit 125 with an inlet 128 through which liquid is introduced, and an outlet from which liquid is discharged from the apparatus. The apparatus 101 further has a metering chamber 134b formed within the valve stem 104, incorporating a liquid discharge element 131 which is moveable by fluid pressure from the container 102 from a liquid primed position, to a liquid discharged position to effect discharge of said metered volume of liquid. The liquid discharge element 131 is moveable by a returning force from its liquid discharged position to its liquid primed position. The apparatus 101 further has an inlet/ outlet arrangement 126 for introduction of liquid from the container into the metering chamber 134b and for discharge of liquid from the metering chamber 134b. The apparatus also has a housing 103 wherein the valve stem 104 and the inner surface of the housing are arranged such that a fluid transfer passageway 135 is defined therebetween, and the discharge conduit 125 arrangement of the valve stem provides 104 in the second limit position thereof communication between the outlet of the metering chamber 134b and the outlet 125 of the valve stem 104 via the fluid transfer passageway 128. The liquid discharge element 131 may be a sphere. |
