TEMPERATURE SENSITIVE CONTROL VALVE

PROBLEM TO BE SOLVED: To provide a temperature sensitive control valve having improved followability to an external atmospheric temperature.SOLUTION: In one embodiment of this invention, a temperature sensitive control valve 1 includes: a flow path 12 in which cooling water flows; a valve seat 16 arranged in the flow path 12; a valve body 14 adapted to be seated on the valve seat 16; an SMA spring 17 arranged so as to energize the valve body 14 in the direction of approaching the valve seat 16, and formed of a shape-memory alloy which is sensitive to a temperature to change its generated load; a storage chamber 13 storing the SMA spring 17; a ventilation window 32 for opening the storage chamber 13 to the outside; and a barrier membrane 15 connected to the valve body 14 for segregating the flow path 12 and the storage chamber 13 from each other. The storage chamber 13 includes an SMA spring storage space 35 in which the SMA spring 17 is arranged, and an air space 36 formed in a position on the side of the barrier membrane 15 further than the SMA spring storage space 35 in the direction of energizing the SMA spring 17.SELECTED DRAWING: Figure 1 【課題】外部の雰囲気温度への追従性が向上する感温制御弁を提供する。【解決手段】本発明の一態様は、冷却水が流れる流路１２と、流路１２内に配置される弁座１６と、弁座１６に着座可能な弁体１４と、弁体１４を弁座１６に近づく方向へ付勢するように配置され、温度に感応して発生荷重が変化する形状記憶合金により形成されるＳＭＡスプリング１７と、ＳＭＡスプリング１７を収容する収容室１３と、収容室１３を外部に開放させる通気窓３２と、弁体１４に接続し流路１２と収容室１３を隔離する隔膜１５と、を有する感温制御弁１において、収容室１３は、ＳＭＡスプリング１７が配置されるＳＭＡスプリング収容空間３５と、ＳＭＡスプリング１７の付勢方向においてＳＭＡスプリング収容空間３５よりも隔膜１５側の位置に形成される空気層３６と、を備えている。【選択図】図１