Valve needle and electronic expansion valve having valve needle

A valve needle, wherein the valve needle is provided with a connecting end and a blocking end that are arranged opposite to each other;

• the blocking end comprises a blocking segment, a first opening segment, and a second opening segment that are sequentially connected in an axial direction;
• the blocking segment is configured to cooperate with a valve port to block the valve port;
• a cross sectional area of the blocking segment close to the connecting end is greater than a cross sectional area of the blocking segment distant from the connecting end;
• a cross sectional area of the second opening segment close to the connecting end is greater than a cross sectional area of the second opening segment distant from the connecting end;
• the cross sectional area of the blocking segment distant from the connecting end is equal to the cross sectional area of the second opening segment close to the connecting end;
• and a cross sectional area of the first opening segment remains unchanged;
• wherein a length of the first opening segment is greater than or equal to 0.1 mm and less than or equal to 0.6 mm, when the first opening segment is located at the valve port, a gap between the first opening segment and the valve port remains unchanged.