| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a shutoff valve device movable within such a range of current value and voltage value that do not cause ignition in fuel gas. <P>SOLUTION: A shutoff valve 30 includes: a motor 31 that rotates a rotary shaft 45; a lead screw 46 formed on the rotary shaft 45; and a valve body 32, which has a lead nut 49 for screwing together with the lead screw 46 and which moves in the axial direction in response to the rotation of the rotary shaft 45, and is for the purpose of blocking off the flow path. A dry lubricating film is formed on the contact surfaces where the lead screw 46 and the lead nut 49 make contact. The pitch interval of the threads of the lead screw 46 is set such that, with respect to the inductance of the motor 31, the current applied to the motor is within a range that does not cause an explosion in the fuel gas, and within a range such that the thrust required to move the valve body 32 can be obtained. <P>COPYRIGHT: (C)2012,JPO&INPIT |
