| 摘要 |
<p>PURPOSE:To provide such a vacuum flange that is so high in reliability as dispensing with any additional retightening and ease of handing, by way of having a flange plate followed to the creep deformation of a gasket, and preventing any sealing surface pressure drop from occurring. CONSTITUTION:When a diameter of a knife edge 1a is set to Dmm, a root area in a bolt 3 to Amm<2>, an allowable stress to sigmam kg/mm<2>, a piece number to N, a spring constant in an elastic body 4 to Kkg/mm, a deformed value to deltamm, and a spring maximum deformed value allowable from flange constitution to deltamax, respectively, the elastic body 4 with the spring constant of value in a range of 10piD/N<Kdelta<Asigmam, 0.2<=delta<=deltamax is installed in space between the bolt 3 and a flange plate 1.</p> |
