H74H-16C/25C对夹圆片式止回阀是一种超薄止回阀，它具有结构简单，外形美观、重量轻、安装方便等优点。主要适用于给水系统、石油、化工、冶金等工业部门对有安装空间限制的场所为适用。是能自动阻止流体倒流的阀门。止回阀的阀瓣在流体压力作用下开启，流体从进口侧流向出口侧。
H74W 对夹止回阀主要尺寸及重量
| 公称压力 PN(MPa) |
公称通径 DN(mm) |
尺寸(mm) | 配管法兰(供参考) | ||||
| L | D | D1 | 螺栓孔中心 圆直径D1 |
螺栓数量 | 螺栓直径D | ||
| 1.0 | 50 | 14.5 | 109 | 25 | 125 | 4 | M16 |
| 60 | 14.5 | 129 | 38 | 145 | 4 | M16 | |
| 80 | 14.5 | 144 | 46 | 160 | 8 | M16 | |
| 100 | 14.5 | 164 | 71.5 | 180 | 8 | M16 | |
| 125 | 16 | 194 | 95 | 210 | 8 | M16 | |
| 150 | 19 | 221 | 114 | 240 | 8 | M20 | |
| 200 | 29 | 275 | 140 | 295 | 8 | M20 | |
| 250 | 29 | 330 | 188 | 350 | 12 | M20 | |
| 300 | 38 | 380 | 216 | 400 | 12 | M20 | |
| 350 | 41 | 440 | 263 | 460 | 16 | M20 | |
| 400 | 51 | 492 | 305 | 515 | 16 | M24 | |
| 450 | 51 | 541 | 356 | 565 | 20 | M24 | |
| 500 | 65 | 596 | 406 | 620 | 20 | M24 | |
| 600 | 70 | 698 | 482 | 725 | 20 | M27 | |
| 1.6 | 50 | 14.5 | 109 | 25 | 125 | 4 | M16 |
| 60 | 14.5 | 129 | 38 | 145 | 4 | M16 | |
| 80 | 14.5 | 144 | 46 | 160 | 8 | M16 | |
| 100 | 14.5 | 164 | 71.5 | 180 | 8 | M16 | |
| 125 | 16 | 194 | 95 | 210 | 8 | M16 | |
| 150 | 19 | 221 | 114 | 240 | 8 | M20 | |
| 200 | 29 | 275 | 140 | 295 | 8 | M20 | |
| 250 | 29 | 331 | 188 | 355 | 12 | M24 | |
| 300 | 38 | 386 | 216 | 410 | 12 | M24 | |
| 350 | 41 | 446 | 263 | 470 | 16 | M24 | |
| 400 | 51 | 498 | 305 | 525 | 16 | M27 | |
| 450 | 51 | 558 | 356 | 585 | 20 | M27 | |
| 500 | 65 | 620 | 406 | 650 | 20 | M30 | |
| 600 | 70 | 737 | 482 | 770 | 20 | M33 | |
| 2.0 | 50 | 14.5 | 109 | 25 | 125 | 4 | M16 |
| 60 | 14.5 | 129 | 38 | 145 | 4 | M16 | |
| 80 | 14.5 | 144 | 46 | 160 | 8 | M16 | |
| 100 | 14.5 | 170 | 71.5 | 190 | 8 | M20 | |
| 125 | 16 | 196 | 95 | 220 | 8 | M24 | |
| 150 | 19 | 226 | 114 | 250 | 8 | M24 | |
| 200 | 29 | 286 | 140 | 310 | 8 | M24 | |
| 250 | 29 | 343 | 188 | 370 | 12 | M27 | |
| 300 | 38 | 403 | 216 | 430 | 12 | M27 | |
| 350 | 41 | 460 | 263 | 490 | 16 | M30 | |
| 400 | 51 | 517 | 305 | 550 | 16 | M33 | |
| 450 | 51 | 567 | 356 | 600 | 20 | M33 | |
| 500 | 65 | 627 | 406 | 660 | 20 | M33 | |
| 600 | 70 | 737 | 482 | 770 | 20 | M36 | |
| 4.0 | 50 | 14.5 | 109 | 51 | 125 | 4 | M16 |
| 60 | 14.5 | 129 | 65 | 145 | 4 | M16 | |
| 80 | 14.5 | 144 | 80 | 160 | 8 | M16 | |
| 100 | 14.5 | 170 | 105 | 190 | 8 | M20 | |
| 125 | 16 | 196 | 127 | 220 | 8 | M24 | |
| 150 | 19 | 226 | 152 | 250 | 8 | M24 | |
| 200 | 29 | 293 | 203 | 320 | 8 | M27 | |
| 250 | 29 | 355 | 254 | 385 | 12 | M30 | |
| 300 | 38 | 420 | 305 | 405 | 12 | M30 | |
| 350 | 41 | 477 | 350 | 510 | 16 | M33 | |
| 400 | 51 | 549 | 400 | 585 | 16 | M36 | |
| 450 | 51 | 574 | 450 | 610 | 20 | M36 | |
| 500 | 65 | 631 | 500 | 670 | 20 | M39 | |
| 600 | 70 | 750 | 600 | 795 | 20 | M45 | |
