石油、化工及相关工业用的钢制旋启式止回阀 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  | 
|
|   50  | 
  50  | 
  50  | 
  50  | 
  47  | 
  47  | 
  38  | 
|   65  | 
  63  | 
  63  | 
  63  | 
  57  | 
  57  | 
  47  | 
|   80  | 
  76  | 
  76  | 
  76  | 
  72  | 
  69  | 
  57  | 
|   100  | 
  100  | 
  100  | 
  100  | 
  98  | 
  92  | 
  72  | 
|   150  | 
  150  | 
  150  | 
  150  | 
  146  | 
  136  | 
  111  | 
|   200  | 
  200  | 
  200  | 
  199  | 
  190  | 
  177  | 
  146  | 
|   250  | 
  250  | 
  250  | 
  247  | 
  238  | 
  222  | 
  184  | 
|   300  | 
  300  | 
  300  | 
  298  | 
  282  | 
  263  | 
  218  | 
|   350  | 
  336  | 
  336  | 
  326  | 
  311  | 
  288  | 
  —  | 
|   400  | 
  387  | 
  387  | 
  374  | 
  355  | 
  330  | 
  —  | 
|   450  | 
  438  | 
  431  | 
  419  | 
  400  | 
  371  | 
  —  | 
|   500  | 
  488  | 
  482  | 
  463  | 
  444  | 
  415  | 
  —  | 
|   600  | 
  590  | 
  584  | 
  558  | 
  533  | 
  498  | 
  —  | 
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