Thermal expansion valve

Abstract

A heat transmission retardant member 140 is formed of a cup-like shaped resin material utilizing nylon or polyacetals, comprising a collar 141, and a thick-walled cylinder portion 143 having at the lower end thereof a tapered portion 142. Said retardant member 140 contacting the outer surface of a heat-sensing driven member 100. Said retardant member 140 is mounted to said driven member 100 so as to cover the outer surface thereof and being mounted outside the second refrigerant passage 63, said cylinder portion 143 defining a space 144 between the exterior of the driven member 100 and the interior of said cylinder portion 143. By the existence of the activated carbon 70, the hunting phenomenon and the invasion of the refrigerant to a lower chamber 85 is prevented, and the heat from the heat transmission retardant member 140 is transmitted to the heat sensing driven member 100 via space 144 which enables to provide a further retardation to the response of the valve to the temperature change of the refrigant exiting the evaporator. The hunting is further suppressed effectively.

Dependencies are inferred from the claim text.