Electronic expansion valve, and air conditioner

摘要

An electronic expansion valve, comprising a valve body, a valve seat, and a stepping motor. A valve section is formed at the tip of the valve body. The valve seat forms a variable throttle section between itself and the valve section, as a result of the valve body moving in the axial direction. The stepping motor causes the valve section to move in accordance with the number of pulses. At least one section of the side surface of the valve section is formed in a shape having a constant aperture ratio.