口徑(英寸) | 壓力等級ANSI Class | ||
150 | 300 | 600 | |
1 | ●□ | ●□ | ● |
1 1/2 | ●□ | ●□ | ● |
2 | ●□ | ●□ | ● |
3~6 | ●□ | ●□ | ● |
8~12 | ● | ● | ● |