Patent ID: 6474088
Filing Date: 2002-11-05
Classification: F25B

Abstract:
A thermal expansion valve including a refrigerant passage extending from an evaporator to a compressor, and a heat-sensing driven member with a hollow portion formed to the interior thereof and having a heat sensing function that is positioned within said refrigerant passage; wherein the end of said hollow portion of said heat-sensing driven member is fixed to the center opening portion of a diaphragm constituting a power element portion that drives said driven member, thereby communicating said hollow portion with an upper pressure chamber defined by said diaphragm within said power element portion and forming a sealed space filled with working fluid, said hollow portion storing a time constant retardant material; and a heat transmission retardant member including a thick-wall portion and a thin-wall portion is mounted to and covers the outer circumferential surface of said heat-sensing driven member, said thick-wall portion mounted outside said refrigerant passage and forming a space between said outer circumferential surface, and said thin-wall portion mounted within said refrigerant passage.