| 公称直径 | 2.5MPa | 4.0MPa | ||||
| Dg | HG | HGJ | SY | HG | HGJ | SY |
| 25 | 3 | 3 | 3 | 3 | ||
| 32 | 3 | 3 | 3 | 3 | ||
| 40 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
| 50 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
| 65 | 4 | 4 | 4 | 4 | 4 | 4 |
| 80 | 4 | 4 | 4 | 4 | 4 | 4 |
| 100 | 4 | 4 | 4 | 4 | 4 | 4 |
| 125 | 4 | 4 | 4 | 4 | 4 | 4.5 |
| 150 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 5 |
| 175 | 6 | 6 | 6 | 6 | 6 | 7 |
| 200 | 6 | 6 | ||||
| 225 | 7 | 7 | ||||
| 250 | 8 | 7 | 7 | 8 | 7 | 7 |
| 300 | 8 | 8 | 8 | 9 | 9 | 9 |
| 350 | 9 | 9 | 9 | 10 | 9 | 9 |
| 400 | 9 | 9 | 9 | 11 | 11 | 11 |
| 450 | 9 | 9 | 10 | 12 | ||
| 500 | 9 | 9 | 11 | |||
| 600 | 9 | 9 | 12 | |||