SHUTOFF VALVE DEVICE

摘要

A shutoff valve (30) according to the present invention includes: a motor (31) configured to cause a rotating shaft (45) to rotate; a lead screw (46) formed on the rotating shaft (45); a lead nut (49) into which the lead screw (46) is screwed; and a valve element (32) configured to block a passage, the valve element (32) being configured to move in an axial direction in accordance with rotation of the rotating shaft (45). A dry lubricating coating is formed on a contact surface where the lead screw (46) and the lead nut (49) come into contact with each other. A thread pitch of the lead screw (46) is set such that a current applied to the motor (31), the current being in relation to an inductance of the motor, is in a range that does not cause explosion of the fuel gas and that allows thrust force necessary for moving the valve element (32) to be obtained.