EGR VALVE

PROBLEM TO BE SOLVED: To prevent the generation of condensed water in an EGR gas flow passage.SOLUTION: An EGR valve 1 comprises a housing 2, a flow passage 3 arranged in the housing 2 for making an EGR gas flow, a valve seat 4 arranged at the flow passage 3, and a valve body 5 which is arranged at the valve seat 4 so as to be seatable, and forms a measurement part of the EGR gas between the valve seat 4 and itself. A flow rate of the EGR gas in the flow passage 3 is adjusted by changing an opening area of the measurement part by moving the valve body 5 to the valve seat 4. The housing 2 is formed of resin. The EGR valve comprises a pipe-shaped flow passage member 8 differently from the housing 2, the flow passage member 8 is covered with the housing 2, and the flow passage 3 is arranged in the housing 2. The flow passage member 8 is formed of a material which is higher than the housing 2 in heat conductivity. A hot water passage 9 in which hot water flows is formed at the flow passage member 8. 【課題】ＥＧＲガスの流路における凝縮水の発生を防止すること。【解決手段】ＥＧＲバルブ１は、ハウジング２と、ＥＧＲガスを流すためにハウジング２の中に設けられた流路３と、流路３に設けられた弁座４と、弁座４に着座可能に設けられ、弁座４との間でＥＧＲガスの計量部を形成する弁体５とを備える。弁体５を弁座４に対し移動させて計量部の開口面積を変化させることにより流路３におけるＥＧＲガスの流量を調節する。ハウジング２が樹脂により形成される。ハウジング２とは別に製造された管状の流路部材８を備え、流路部材８がハウジング２で覆われることでハウジング２の中に流路３が設けられる。流路部材８がハウジング２よりも熱伝導率の高い材料により形成される。流路部材８には、温水が流れる温水通路９が形成される。【選択図】 図４