Patent ID: 8851394

Claim:
A thermal expansion valve used in a vapor compressing refrigeration cycle so as to decompress and expand high-pressure refrigerant and to send the expanded low-pressure refrigerant toward an inlet of an evaporator, the thermal expansion valve comprising: a body portion having a first refrigerant passage through which the high-pressure refrigerant passes, a throttle passage located in the first refrigerant passage so as to decompress and expand refrigerant, and a second refrigerant passage through which refrigerant flowing out of the evaporator passes; an element portion arranged outside of the body portion, the element portion having a pressure responding member to be displaced in accordance with a pressure difference between an inner pressure of a seal space and a pressure of refrigerant flowing through the second refrigerant passage, the seal space being sealed and filled with a temperature sensing media, the media having a pressure changed by a temperature variation; a valve portion to be displaced in accordance with a displacement of the pressure responding member so as to control an opening degree of the throttle passage; and an additive filled in the seal space together with the temperature sensing media so as to lower a condensing temperature of the temperature sensing media; wherein the temperature sensing media has a gas phase in the seal space and the additive has a liquid phase in the seal space.