PURPOSE: To obtain characteristics, showing slow response when overheating degree is increased and quick response when the same is decreased without loosing any balancing characteristic, by a method wherein the sinter of ceramics constituted of silica alumina is arranged in the temperature sensible unit of a temperature expansion valve.

CONSTITUTION: The sinter 22a of ceramics constituted of silica alumina is arranged in a temperature sensible tube 20 as a thermal balast material while the temperature sensible tube 20 is attached to a pipeline at the outlet port of an evaporator. When the overheating degree of the outlet port of the evaporator is reduced than the condition of thermal equilibrium, the wall surface temperature of the temperature sensible tube 20 is reduced and the inner wall of a metallic part makes an area, in which the temperature thereof is suddenly lower compared with the thermal balast unit 22a, and gas contacting with it is liquefied quickly, whereby the pressure of the temperature sensible tube 20 is reduced. Accordingly, it shows quick response. When the overheating degree is increased on the contrary or the temperature sensible tube 20 has felt the high temperature of external disturbance, the outer wall temperature of the same is transferred to the ceramics sinter 22a of the thermal balast through the copper tube of an outer shell 21. Accordingly, a delay is generated in a time necessary for the transfer of the heat and the temperature sensible tube 20 shows slow response.