| 摘要 |
<p>PURPOSE:To prevent generation of crack due to the buckling of the inner peripheral surface of a through hole by making the inside diameter of the though hole on a fuse packing which is fitted on a valve casing inserted into a passing hole on a pressure container smaller than the outside diameter of the sealing part of the valve casing. CONSTITUTION:A cavity 4 is formed between the hole wall 2a of a through hole 2 on a pressure container 1 and the peripheral wall 3 of a valve casing 3 which is loosely fitted on the outside from the inside of the pressure container 1, and a fuse packing 5 is interposed. The inside diameter of the through hole D0 of the fuse packing 5 is made smaller than the outside diameter D2 of the lower edge part of the sealing part 3e of the valve casing 3. Accordingly, the inside diameter of the through hole 5a of the fuse packing 5 is increased gradually by the sealing part 3e, and generation of crack due to the buckling of the inner surface is prevented, and generation of reaction force and the seal leakage can be prevented.</p> |
