| 摘要 |
Foam is produced when a reservoir is deformed by squeezing. When pressure is applied to the reservoir, a vent passage is sealed by a flexible washer, while liquid is forced up a tube and through a passage in a cylindrical member to a region at the top of that member. Air is forced through another passage and swirls into the same region to mix with the liquid. As the pressure of the mixture increases, a ball valve located above the region, is caused to open which allows discharge of the mixture. When the pressure is released, the valve is sealed and suction pulls the washer away from the vent to allow air back into the reservoir.
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