石油、天然气工业用螺柱连接阀盖的钢制闸阀 闸板的磨损余量
                        
|   公称尺寸 DN  | 
  磨损余量/mm  | 
|   25~50  | 
  ≥2.3  | 
|   65~150  | 
  ≥3.3  | 
|   200~300  | 
  ≥6.4  | 
|   350~450  | 
  ≥9.7  | 
|   500~600  | 
  ≥12.7  | 
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