| 摘要 |
PURPOSE:To increase the valve capacity by enlarging the cross-section of flow control window from the inside toward the outside of cage. CONSTITUTION:Many flow control windows 10 having portion 10a where the window width is approximately same and pointed head section 10b are provided on the partition wall 2 of cage 8. Since said windows 10 are punched through press, the wall of opening 10c at the punched side is tapered to make the outside opening width wider by 1mm. than the inside opening width. Consequently, flow of fluid passing through said window 10 or the valve capacity can be increased reliably through pressure recovery effect of bellmouth. |
