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.
