| 摘要 |
Containers for dispensing pressurized fluids, such as aerosols, comprise a space for the fluid and a wall movable automatically to reduce the volume of the space as the contents become exhausted, a vacuum chamber being arranged in communication with at least a part of the movable wall in such a manner as to maintain the pressure on the pressurized fluid at a substantially constant level. A spring may be provided to act on the movable wall so as to apply pressure to the pressurized fluid, in which case the vacuum chamber is arranged to act in opposition to the spring and to reduce its effect as the spring extends. Alternatively the spring may be omitted and the fluid space and vacuum chamber may be arranged to vary in volume in the same sense, the vacuum acting on the movable wall to apply pressure to the pressurized fluid.
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