| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an annular seal member and a seal structure used in sealing a port hole of a housing by an outer peripheral face of a shaft member when a valve is closed, in a valve structure for opening and closing a flow channel by the shaft member having a through hole. <P>SOLUTION: The annular seal member is a seal member deformed into the curved shape to have a radius of curvature equal to that of the outer peripheral face of the shaft member in a natural state. Whereby problems on the projecting from a seal groove formed on the outer peripheral face of the shaft member and the fracture in opening and closing operation of the valve, of the seal member can be solved, and the durability of the annular seal member can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
