石油、石化及相关工业用钢制截止阀和升降式止回阀 阀体密封座的最小直径
                                                                                                                                                      
|   公称尺寸 DN  | 
  公 称 压 力 PN  | 
|||||
|   16、20  | 
  25~50  | 
  63~110  | 
  150﹑160  | 
  250﹑260  | 
  420  | 
|
|   阀体密封座的最小直径/mm  | 
||||||
|   15  | 
  13  | 
  13  | 
  13  | 
  13  | 
  13  | 
  11  | 
|   20  | 
  19  | 
  19  | 
  19  | 
  18  | 
  17  | 
  14  | 
|   25  | 
  25  | 
  25  | 
  25  | 
  23  | 
  22  | 
  19  | 
|   32  | 
  32  | 
  32  | 
  32  | 
  30  | 
  29  | 
  25  | 
|   40  | 
  38  | 
  38  | 
  38  | 
  36  | 
  35  | 
  29  | 
|   50  | 
  51  | 
  51  | 
  51  | 
  49  | 
  48  | 
  38  | 
|   65  | 
  64  | 
  64  | 
  64  | 
  60  | 
  57  | 
  48  | 
|   80  | 
  76  | 
  76  | 
  76  | 
  72  | 
  70  | 
  57  | 
|   100  | 
  102  | 
  102  | 
  102  | 
  98  | 
  92  | 
  73  | 
|   150  | 
  152  | 
  152  | 
  152  | 
  146  | 
  137  | 
  111  | 
|   200  | 
  203  | 
  203  | 
  200  | 
  190  | 
  178  | 
  146  | 
|   250  | 
  254  | 
  254  | 
  248  | 
  238  | 
  222  | 
  184  | 
|   300  | 
  305  | 
  305  | 
  298  | 
  283  | 
  264  | 
  219  | 
|   350  | 
  337  | 
  —  | 
  —  | 
  311  | 
  —  | 
  —  | 
|   400  | 
  387  | 
  —  | 
  —  | 
  —  | 
  —  | 
  —  | 
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