国内阀门材料常用技术标准 阀门、法兰和管道配件用灰铁铸件 相当等级(标准 A 48)
标准 A 126 等级 |
<0.50英寸 [12.7mm] |
0.51-1.00英寸 [13.0-25.4mm] |
>1英寸 [25.4mm] |
A | 25 A | 20 B | 20 C |
B | 35 A | 30 B | 30 C |
C | 45 A | 40 B | 40 C |
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