| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and sufficient seal contact area by forming a first contact surface formed on a valve element in a taper shape while slanting inside as approaching to the downside and forming a first seal seat surface contacting to this first contact surface in a taper shape slanted inside. SOLUTION: A first contact surface 25, 25 slanted obliquely upward is formed on the lower surface of the valve element base end 50 of a valve element main body. A second contact surface 27 is formed in a nearly U shape on the side surface of a sheet 56. These first/second contact surfaces 25, 27 are formed while slanting inside in a taper shape respectively against first/second seal seat surfaces 32, 44. By this constitution, when the valve element moves the opening for valve element downward and the first contact surface 25 is contacted to the first seal seat surface 32, these surface are complementary taper shape slat surface and seated by the guide of this taper shape slant surface. Then, as a shearing force is generated between the slant surfaces by the taper effect, the seal effect can be achieved surely.
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