To make quickly discharging possible of a large amount of low temperature fluid.

Between upper/lower wall members 13, 18, a peripheral edge of a diaphragm 15 is secured, between the upper wall member and the diaphragm 15, an expansion medium 19 is sealed, a temperature control element 10 mounting a valve member 17 in the diaphragm 15 is arranged in a valve chamber 3. In the periphery of the temperature control element 10, a fluid passing passage 27 is formed. In the temperature control element 10, a fluid passing hole 22 is formed through the upper wall member 13, diaphragm 15 and the valve member 17. A leadthrough path 9 of passage area larger than the fluid passing hole 22 is formed in a partition member 6 between the valve chamber 3 and an outlet 4. A temperature responding member 25 is provided, which seats the lower wall member 18 in the partition member 6 at high temperature time and separates the member 18 from the partition member 6 at low temperature time. A first seal part 28 closing a flow in the lead-through path from the fluid passing passage, when the lower wall member 18 is seated in the partition member 6, is formed between the lower wall member 18 and the partition member 6. A second seal part 29 closing a flow in the lead-through path from the fluid passing passage, when the valve member 17 is seated in the partition member 6, is formed between the valve member 17 and the partition member 6.