石油、石化及相关工业用钢制截止阀和升降式止回阀 旁通装置接管的公称尺寸
|   截止阀的公称尺寸 DN  | 
   旁通装置接管公称尺寸 DN  | 
 
|   50~100  | 
   15  | 
 
|   125~200  | 
   20  | 
 
|   250~300  | 
   25  | 
 
|   350~400  | 
   40  | 
 
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