Electronic expansion valve

An electronic expansion valve, comprising a valve seat, the valve seat being provided with a valve cavity, a valve core seat being fixed in the valve cavity, and the valve core seat being provided with a valve core valve port and a bypass through hole;

• the electronic expansion valve further comprising a valve needle component which is movable in an axial direction to cooperate with the valve core valve port and a piston component which is movable in the axial direction to open and close the bypass through hole;
• and the electronic expansion valve further comprising a transverse connecting pipe functioning as an inlet connecting pipe and a vertical connecting pipe functioning as an outlet connecting pipe, the transverse connecting pipe and the vertical connecting pipe are installed on the valve seat;
• wherein,
• the piston component and the valve needle component are located at a same side of the valve core seat, and in a case that refrigerant flows forwards, the piston component closes the bypass through hole, the refrigerant flows to a side of the vertical connecting pipe via the valve core valve port, and the valve needle component moves in the axial direction to regulate an opening of the valve core valve port;
• and in a case that the refrigerant flows reversely, the piston component moves upwards in the axial direction to open the bypass through hole, and the refrigerant flows to a side of the transverse connecting pipe via the bypass through hole.