美标止回阀按照API6D标准生产和检验，它采用球形阀体，单瓣旋启式结构。与管道法兰连接，利用管道自身的压力自动完成阀门的开启和关闭动作，从而实现单向流通，逆向止回阀的效果。旋启式美标止回阀开闭迅速，密封可靠而成为Z常用的一种止回阀
【主要零件材料】
| 阀体 | ASTM A216 WCB | ASTM A351 CF8 | ASTM A351 CF8M | ASTM A351 CF3 | ASTM A351 CF3M |
| 阀盖 | ASTM A216 WCB | ASTM A351 CF8 | ASTM A351 CF8M | ASTM A351 CF3 | ASTM A351 CF3M |
| 阀瓣 | ASTM A216 WCB | ASTM A351 CF8 | ASTM A351 CF8M | ASTM A351 CF3 | ASTM A351 CF3M |
| 摇杆 | ASTM A216 WCB | ASTM A351 CF8 | ASTM A351 CF8M | ASTM A351 CF3 | ASTM A351 CF3M |
| 销轴 | F6a | 304 | 316 | 304L | 316L |
| 阀座 | 13Cr / STL | 本体/ STL | 本体/ STL | 本体/ STL | 本体/ STL |
【主要外形尺寸】
Class150 磅级主要外形尺寸
| in | mm | L | D | D1 | D2 | b | f | z-φd | H | 重量 |
| 2 | 50 | 203 | 152 | 120.5 | 92 | 16 | 1.6 | 4-19 | 165 | 17 |
| 21/2 | 65 | 216 | 178 | 139.5 | 105 | 17.5 | 1.6 | 4-19 | 175 | 25 |
| 3 | 80 | 241 | 190 | 152.5 | 127 | 19.5 | 1.6 | 4-19 | 190 | 29 |
| 4 | 100 | 292 | 229 | 190.5 | 157 | 24 | 1.6 | 8-19 | 215 | 50 |
| 5 | 125 | 330 | 254 | 216 | 186 | 24 | 1.6 | 8-22 | 245 | 75 |
| 6 | 150 | 356 | 279 | 241.5 | 216 | 25.5 | 1.6 | 8-22 | 265 | 85 |
| 8 | 200 | 495 | 343 | 298.5 | 270 | 29 | 1.6 | 8-22 | 320 | 150 |
| 10 | 250 | 622 | 406 | 362 | 324 | 30.5 | 1.6 | 12-25 | 365 | 240 |
| 12 | 300 | 698 | 483 | 432 | 381 | 32 | 1.6 | 12-25 | 415 | 350 |
| 14 | 350 | 787 | 533 | 476 | 413 | 35 | 1.6 | 12-29 | 460 | 460 |
| 16 | 400 | 864 | 597 | 540 | 470 | 37 | 1.6 | 16-29 | 495 | 580 |
| 20 | 500 | 978 | 698 | 635 | 584 | 43 | 1.6 | 20-32 | 590 | 840 |
| 24 | 600 | 1295 | 813 | 749.5 | 692 | 48 | 1.6 | 20-35 | 650 | 1140 |
Class300磅级主要外形尺寸
| in | mm | L | D | D1 | D2 | b | f | z-φd | H | 重量 |
| 2 | 50 | 267 | 165 | 127 | 92 | 22.5 | 1.6 | 8-19 | 190 | 28 |
| 21/2 | 65 | 292 | 190 | 149 | 105 | 25.5 | 1.6 | 8-22 | 205 | 33 |
| 3 | 80 | 318 | 210 | 168 | 127 | 28 5 | 1.6 | 8-22 | 220 | 45 |
| 4 | 100 | 356 | 254 | 200 | 157 | 32 | 1.6 | 8-22 | 245 | 70 |
| 5 | 125 | 400 | 279 | 235 | 186 | 35 | 1.6 | 8-22 | 275 | 110 |
| 6 | 150 | 444 | 318 | 270 | 216 | 36.5 | 1.6 | 12-22 | 295 | 150 |
| 8 | 200 | 533 | 381 | 330 | 270 | 41.5 | 1.6 | 12.25 | 330 | 230 |
| 10 | 250 | 622 | 444 | 387.5 | 324 | 48 | 1.6 | 16-29 | 420 | 390 |
| 12 | 300 | 711 | 521 | 451 | 381 | 51 | 1.6 | 16-32 | 480 | 520 |
| 14 | 350 | 838 | 584 | 514.5 | 413 | 54 | 1.6 | 20-32 | 535 | 710 |
| 16 | 400 | 864 | 648 | 571.5 | 470 | 57.5 | 1.6 | 20-35 | 585 | 890 |
| 20 | 500 | 1016 | 775 | 686 | 584.5 | 63.5 | 1.6 | 24-35 | 685 | 1360 |
| 24 | 600 | 1364 | 914.5 | 813 | 692.5 | 70 | 1.6 | 24-41 | 785 | 2040 |
Class600磅级主要外形尺寸
| in | mm | L | D | D1 | D2 | b | f | z-φd | H | 重量 |
| 2 | 50 | 292 | 165 | 127 | 92 | 26 | 6.4 | 8-19 | 210 | 32 |
| 21/2 | 65 | 330 | 190 | 149 | 100 | 29 | 6.4 | 8-22 | 230 | 42 |
| 3 | 80 | 356 | 210 | 168 | 127 | 32 | 6.4 | 8-22 | 255 | 60 |
| 4 | 100 | 432 | 273 | 216 | 157 | 38 | 6.4 | 8-25 | 295 | 95 |
| 5 | 125 | 508 | 330 | 266.5 | 186 | 45 | 6.4 | 8-29 | 310 | 120 |
| 6 | 150 | 559 | 355.5 | 292 | 216 | 47.5 | 6.4 | 12-29 | 365 | 220 |
| 8 | 200 | 660 | 419.5 | 349 | 270 | 56 | 6.4 | 12-32 | 420 | 390 |
| 10 | 250 | 787 | 508 | 432 | 324 | 63.5 | 6.4 | 16-35 | 505 | 630 |
| 12 | 300 | 838 | 559 | 489 | 381 | 66.5 | 6.4 | 20-35 | 545 | 870 |
| 14 | 350 | 889 | 603.5 | 527 | 413 | 710 | 6.4 | 20-38 | 600 | 940 |
| 16 | 400 | 991 | 686 | 603 | 470 | 76.5 | 6.4 | 20-41 | 650 | 1100 |
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