| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a valve device having simple construction for opening a valve with a low pressure loss when a fluid is supplied to flow and for closing the valve when the fluid is not supplied. <P>SOLUTION: The valve device 1 provided in a water distribution flow path of a fuel cell system comprises a valve stem 2 provided in a valve box 5 having a valve hole 6 across the flowing direction, a valve element 3 provided on the valve stem 2 in an axially rotatable manner for opening and closing the valve hole 6, a magnetic part 10 formed of a magnetic substance and provided on the valve element 3, and a permanent magnet 11 provided outside the valve hole 6. The valve element 3 is always energized to the valve closing direction with the magnetic effect of the magnetic part 10 on the permanent magnet 11. When water flows, the magnetic element 3 is pushed by fluid pressure to open the valve, and when the water does not flow, it closes the valve by a magnetic energizing force to suppress the convection of gas in the flow path. The valve element energized by the magnetic force can be operated by a relatively small force at the initial stage of opening the valve against the energizing force. When water does not flow in the flow path, the valve element 3 can be restored into a valve closing state by the relatively weak magnetic force. Thus, the weak magnetic force is required to be set, resulting in the lower pressure loss. <P>COPYRIGHT: (C)2007,JPO&INPIT |
