日标铸钢直通截止止回阀 JIS F7473 20K
Standard Materials
| body | sc450 |
| bonnet | sc450 |
| seat | bc6/sus420 |
| disc | sc450 |
| stem | c3771bd or be/sus420 |
| gland | bc6 |
| gasket | non-asbestos |
| DN | d | L | D | C | NO. | h | t | H | D2 |
| 50 | 50 | 220 | 155 | 120 | 4 | 19 | 16 | 265 | 160 |
| 65 | 65 | 270 | 175 | 140 | 4 | 19 | 18 | 295 | 200 |
| 80 | 80 | 300 | 185 | 150 | 8 | 19 | 18 | 300 | 200 |
| 100 | 100 | 350 | 210 | 175 | 8 | 19 | 18 | 345 | 250 |
| 125 | 125 | 420 | 250 | 210 | 8 | 23 | 20 | 405 | 280 |
| 150 | 150 | 490 | 280 | 240 | 8 | 23 | 22 | 455 | 315 |
| 200 | 200 | 570 | 330 | 290 | 12 | 23 | 22 | 545 | 355 |
| 250 | 250 | 740 | 400 | 355 | 12 | 25 | 24 | 645 | 400 |
| 300 | 300 | 840 | 445 | 400 | 16 | 25 | 24 | 735 | 450 |