Electronic expansion valve

An electronic expansion valve, comprising:

• a valve body, wherein the valve body has an accommodating cavity and a valve port, and the valve port communicates with the accommodating cavity;
• a guide sleeve, which is disposed in the accommodating cavity;
• a valve head, which is movably disposed in the guide sleeve, the valve head is configured for blocking or opening the valve port, and a balance channel is disposed in the valve head so as to enable two ends of the valve head to be communicated;
• wherein the valve head has a first end and a second end which are oppositely disposed, the first end is configured for blocking the valve port, the valve head has a first communicating hole, a second communicating hole and a third communicating hole sequentially communicated along a direction from the first end to the second end, an aperture of the first communicating hole and an aperture of the third communicating hole are greater than an aperture of the second communicating hole, an end face area of the first end is S11, an area of a step face formed by the first communicating hole and the second communicating hole is S12, and S1 is a sum of S11 and S12;
• an end face area of the second end is S21, an area of a step face formed by the third communicating hole and the second communicating hole is S22, and S2 is a sum of S21 and S22, and −1.3 mm2≤S1−S2≤1.3 mm2.