Extraction device and extracting method

An extracting method, adapted to an extraction device, the extraction device comprising a first container and a valve, the valve connected to the first container, the extracting method comprising:

• performing a pressure-decreasing process on the first container;
• determining whether an internal pressure of the first container is smaller than or equal to a predetermined value;
• when the internal pressure of the first container is determined to be smaller than or equal to the predetermined value, the valve is activated;
• and
• when the internal pressure of the first container is determined to be larger than the predetermined value of pressure, performing the pressure-decreasing process on the first container.

An extraction device, configured for a mixture comprising a liquid and a raw material and for a first container having an opening, the extraction device comprising:

• a second container, configured for storing the mixture;
• a valve, connected to the second container and the first container;
• and
• an air suction device, configured to decrease an internal pressure of the first container to a predetermined value;
• wherein when the internal pressure of the first container reaches the predetermined value, the valve is activated to connect the second container to the first container.