Coffee extractor

A coffee extractor comprising:

• a body;
• a water tank disposed in said body and having a bottom section;
• an extracting chamber, disposed in said body, for extracting coffee;
• a check valve;
• a riser pipe connected to said bottom section of said water tank through said check valve and having an upper end;
• means for heating water led into said riser pipe;
• a discharge pipe in fluid communication with said riser pipe and having a discharge outlet located above said extracting chamber;
• a purifying unit disposed between said discharge outlet and said extracting chamber;
• a passage change-over housing connected with said upper end of said riser pipe, said passage change-over housing including a lower section;
• a valve port formed in said lower section of said passage change-over housing, for returning hot water into said water tank;
• a valve element for opening and closing said valve port;
• and
• an actuating mechanism, disposed in said water tank, for causing said valve element to close the valve port when water in said water tank is heated up to a set temperature,
• wherein said discharge outlet of said discharge passage is located at a position higher than said passage change-over housing.