石油、化工及相关工业用的钢制旋启式止回阀 放泄孔接管和放泄孔凸台的尺寸
|   止回阀的公称尺寸 DN  | 
   放泄孔接管公称尺寸 DN  | 
   凸台的最小直径/mm  | 
 
|   50~100  | 
   15  | 
   38  | 
 
|   125~200  | 
   20  | 
   44  | 
 
|   250~300  | 
   25  | 
   54  | 
 
|   ≥350  | 
   40  | 
   70  | 
 
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