REED VALVE

To inhibit occurrence of malfunction resulting from a foreign object.SOLUTION: A reed valve 1 includes: a valve body 4; a valve seat 6 having a valve hole 3 through which a fluid J may circulate; a casing 8 which houses the valve body 4; and a reed 10 including an arm part 18 which is fixed at one end part 22 to the casing 8 and a valve body support part 20 connected to the other end part 24 of the arm part 18 and supporting the valve body 4 so as to open or close the valve hole 3. When a circulation direction of the fluid j in the valve hole 3 is defined as a first direction D1 and a surface, which faces the downstream side in the first direction D1, of an inner surface of the casing 8 is defined as a first surface 21, the first surface 21 includes a recessed part 27 facing the arm part 18.SELECTED DRAWING: Figure 2 【課題】異物に起因する作動不良の発生を抑制する。【解決手段】リードバルブ１は、弁体４と、流体Ｊが流通可能な弁孔３を有する弁座６と、弁体４を収容するケーシング８と、一端部２２がケーシング８に固定されたアーム部１８、及びアーム部１８の他端部２４と接続し、弁孔３を開閉可能に弁体４を支持する弁体支持部２０、を含むリードと１０、を備え、弁孔３における流体Ｊの流通方向を第１方向Ｄ１、ケーシング８の内面のうち第１方向Ｄ１の下流側を向く面を第１面２１と定義すると、第１面２１は、アーム部１８に対向する凹部２７を含む。【選択図】 図２