| 摘要 |
A steam structure for an electric coffee maker includes a throttle valve, a steam pipe, an enclosing valve, a valve seat and a backflow pipe, wherein the steam pipe is connected to one side of the throttle valve. The throttle valve is connected to the valve seat at the bottom thereof, and the valve seat then is connected to the backflow pipe. The enclosing valve is placed in the valve seat. The enclosing valve is made of flexible material and includes a valve, a thin film surrounding the valve, and a skirt with holes thereon. The outer edge of the skirt is in touch with the valve seat. The outer diameter of the valve corresponds to the inner diameter of the backflow pipe. When the skirt is pressed downward by the valve due to the steam pressure, the valve encloses the backflow pipe.
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