| 摘要 |
<p>PURPOSE:To obtain a check valve which is simple in its structure, by a method wherein a protrusion is formed on the surface of the center of a flange, a circulation opening and a line of a rift connecting an external circumference of the protrusion with the circulation opening by incising the protrusion are provided on the backside of the protrusion and the whole is formed with an elastic body. CONSTITUTION:As for a check valve 1, a protrusion 12 is provided on the surface of the center of a flange 11 of a valve plug of the same and a bottomed hole 13 formed conically from the backside of the flange of the protrusion 12 is provided. A line of or cross-shaped two lines of rifts are provided on the protrusion 12. When the protrusion 12 part is incorporated toward an outflow side, a duct is tightly closed as a curved part of the flange 11 is corrected into plain and the rift part is adhered to each other, in the fluid duct.</p> |
