| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermostat device capable of carrying out an operation of closing and opening its control valve with excellent response by selectively supplying heating or cooling water for a temperature-sensing part switching therebetween, with the possibility for diversification of switching control as well. SOLUTION: In the thermostat device comprising a control valve 21 controlling the amount of flow of the cooling water running through a radiator 4 provided at the cooling circulation paths C1, C2 of an internal combustion engine 2, and a temperature-sensing part 19 opening and closing the control valve 21 by the temperature of the cooling water, the following are provided: an initial introductory path R1 admitting the cooling water discharged from the radiator 4; a second introductory path R2 admitting the cooling water discharged from the internal combustion engine 2; a flowing amount control valve 32 controlling the amount of flow of the cooling water admitted through the initial and second introductory paths respectively; and controlled cooling water path R3 through which the cooling water controlled by the flowing amount control valve 32 is supplied to the temperature-sensing part 19.
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