VALVE OPENING/CLOSING STATE DETECTION DEVICE

To accurately detect an opening/closing state of a valve.SOLUTION: An opening/closing state detection device for detecting an opening/closing state of a valve that adjusts a flow of working fluid between a working fluid chamber and a working fluid path of a fluid machine comprises: a valve body with conductivity; a housing 10 having a first portion 10f electrically connected to the valve body and having conductivity, a second portion 10g including a valve seat, on which the valve body can seat, and having conductivity, and an insulation part 10e for insulating the first and second portions from each other, and housing the valve body; and a detector 70 for detecting the opening/closing state of the valve based on whether the first and second portions are conducted via the valve body.SELECTED DRAWING: Figure 2 【課題】バルブの開閉状態を精度良く検出すること。【解決手段】流体機械の作動流体室と作動流体流路との間の作動流体の流れを調節するバルブの開閉状態を検出するための開閉状態検出装置であって、導電性を有する弁体と、前記弁体と電気的に接続され、かつ、導電性を有する第１部分１０ｆと、前記弁体が着座可能な弁座を含み、かつ、導電性を有する第２部分１０ｇと、前記第１部分と前記第２部分とを絶縁する絶縁部１０ｅと、を有し、前記弁体を収容するハウジング１０と、前記第１部分と前記第２部分とが前記弁体を介して導通しているか否かに基づいて前記バルブの開閉状態を検出する検出器７０と、を備える、開閉状態検出装置。【選択図】図２