| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a reverse bimetal to quickly reverse to be convex downward at a high temperature. <P>SOLUTION: A disklike reverse bimetal 12 with a larger diameter than that of a valve disk 11 and a little smaller diameter than that of an inner peripheral wall of a variable pressure chamber 4 is mounted on an upper surface of the valve disk 11 and coupled on a center part of the valve disk 11. An annular bimetal seat 14 is provided along an outer circumference of an outer ring valve seat 7. At a low temperature, the reverse bimetal 12 reverses to be convex upward, thus a circumferential rim comes into contact with the bimetal seat 14, and the center part rises to forcibly raise the valve disk 11 to open. In the circumferential rim of the reverse bimetal 12, a recessed portion 15 with a smaller outer diameter than an inner diameter of the bimetal seat 14 is formed. While the reverse bimetal 12 opens the valve disk 11 at a low temperature, a fluid flowing down on a lower surface of the valve disk 11 is likely to flow in above the reverse bimetal 12 from the circumferential rim of the valve disk 11 through the recessed portion 15 that is a small-diameter part of the circumferential rim of the reverse bimetal 12. <P>COPYRIGHT: (C)2013,JPO&INPIT |
