Piston Type Check Valve Description
Piston check valve valve flap is disc-shaped, rotating around the valve seat channel axis for rotary motion, because the valve channel into a streamlined, flow resistance than the rise of butterfly check valve is small, suitable for low-flow rate and flow of infrequent changes in the large-diameter occasions, but should not be used for pulsating flow, and its sealing performance is not as good as the lifting type.
| DESIGN & MANUFACTURING STANDARDS | |
|---|---|
| Basic Design | API 6D |
| Wall Thickness | API 6D |
| Face-to-Face Dimensions | As stated |
| Flange End Dimensions | ANSI/ASME 16.5 |
| Butt-Weld End Dimensions | ANSI/ASME B16.25 |
| Inspection and Testing | API 6D |
Piston Style Check Valve Size Table
Piston Check Valves - API 6D
Sizes: 2" - 24"
Class: 150
| SIZE | IN | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MM | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A - RF | IN | 8.0 | 9.5 | 11.5 | 16 | 19.5 | 24.5 | 27.5 | 31 | 36 | 38.5 | 38.5 | 51 |
| MM | 203 | 241 | 292 | 406 | 495 | 622 | 699 | 787 | 914 | 978 | 978 | 1295 | |
| H1 | IN | 3.25 | 4.875 | 5 | 6.75 | 9.25 | 11.75 | 13.25 | 14.875 | 17 | / | / | / |
| MM | 83 | 124 | 127 | 171 | 235 | 298 | 337 | 378 | 432 | / | / | / | |
| H2 | IN | 7.0 | 8.35 | 10.23 | 14.56 | 17.83 | 22.48 | 25.51 | 27.25 | 30.125 | / | / | / |
| MM | 178 | 212 | 260 | 370 | 451 | 571 | 648 | 692 | 765 | / | / | / | |
| WEIGHT (RF) |
LB | 64 | 124 | 201 | 332 | 610 | 1040 | 1328 | 2010 | 2480 | / | / | / |
| KG | 29 | 56 | 91 | 151 | 277 | 472 | 602 | 912 | 1125 | / | / | / |
Piston Check Valves - API 6D
Sizes: 2" - 16"
Class: 300
| SIZE | IN | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MM | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A-RF | IN | 10.25 | 14.75 | 17.625 | 19.375 | 22.5 | 29.625 | 32 | 35.25 | 39.125 | / | / | / |
| MM | 260 | 375 | 448 | 492 | 572 | 752 | 813 | 895 | 994 | / | / | / | |
| A- BW | IN | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / |
| MM | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / | |
| H1 | IN | 3.25 | 4.875 | 5 | 6.75 | 9.25 | 11.75 | 13.25 | 14.875 | 17 | / | / | / |
| MM | 83 | 124 | 127 | 171 | 235 | 298 | 337 | 378 | 432 | / | / | / | |
| H2 | IN | 8.5 | 10.25 | 12.5 | 17.5 | 20.125 | 23.75 | 24.375 | 27.25 | 30.125 | / | / | / |
| MM | 216 | 260 | 318 | 445 | 511 | 603 | 619 | 692 | 765 | / | / | / | |
| WEIGHT (RF) |
LB | 80 | 155 | 250 | 415 | 750 | 1300 | 1660 | 2500 | 3100 | / | / | / |
| KG | 36 | 70 | 114 | 187 | 341 | 591 | 755 | 1136 | 1409 | / | / | / | |
| AUR = Available Upon Request | |||||||||||||
Piston Check Valves - API 6D
Sizes: 2" - 24"
Class: 600
| SIZE | NPS | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DN | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A - RF | IN | 11 | 14.75 | 18.5 | 20.75 | 24 | 30.88 | 33.625 | 37 | 41.25 | 46 | 55.5 | 60 |
| MM | 279 | 375 | 470 | 527 | 610 | 784 | 854 | 940 | 1048 | 1168 | 1410 | 1524 | |
| A - RTJ | IN | 11.375 | 14.875 | 18.625 | 20.875 | 24.125 | 31 | 33.75 | 37.125 | 41.375 | 46.125 | 55.75 | 60.125 |
| MM | 283 | 378 | 461 | 530 | 613 | 787 | 857 | 943 | 1051 | 1172 | 1413 | 1527 | |
| A - BW | IN | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR |
| MM | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | AUR | |
| H1 | IN | 3.25 | 5.25 | 5.375 | 7 | 9.25 | 11.75 | 13.125 | 14.875 | 17 | 19.25 | 20.875 | 22.125 |
| MM | 83 | 133 | 137 | 178 | 235 | 298 | 333 | 378 | 432 | 489 | 530 | 561 | |
| H2 | IN | 8.5 | 10.25 | 12.125 | 18 | 20.25 | 24.25 | 25.125 | 28.125 | 31.25 | 32.875 | 35.25 | 38.78 |
| MM | 216 | 260 | 308 | 457 | 514 | 616 | 638 | 714 | 794 | 835 | 895 | 985 | |
| WGT (RF) |
LB | 71 | 136 | 215 | 485 | 782 | 1291 | 1880 | 2391 | 3788 | / | 5871 | 8507 |
| KG | 32 | 62 | 98 | 220 | 355 | 586 | 853 | 1084 | 1718 | / | 2663 | 3858 | |
| AUR = Available Upon Request | |||||||||||||
Piston Check Valves - API 6D
Sizes: 2" - 12"
Class: 900
| SIZE | NPS | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DN | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A - RF | IN | / | 14.875 | 19.375 | 21.875 | 24.875 | 31.375 | 33.875 | / | / | / | / | / |
| MM | / | 378 | 492 | 556 | 632 | 797 | 860 | / | / | / | / | / | |
| A - RTJ | IN | / | 15 | 19.5 | 22 | 25 | 31.5 | 33.125 | / | / | / | / | / |
| MM | / | 381 | 495 | 559 | 635 | 800 | 857 | / | / | / | / | / | |
| A - BW | IN | / | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / |
| MM | / | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / | |
| H1 | IN | / | 5.25 | 5.375 | 7 | 9.25 | 11.75 | 13.125 | / | / | / | / | / |
| MM | / | 133 | 137 | 178 | 235 | 298 | 333 | / | / | / | / | / | |
| H2 | IN | / | 10.25 | 12.125 | 18 | 20.25 | 24.25 | 25.125 | / | / | / | / | / |
| MM | / | 260 | 308 | 457 | 514 | 616 | 638 | / | / | / | / | / | |
| WGT (RF) |
LB | / | 175 | 290 | 550 | 810 | 1650 | 2450 | / | / | / | / | / |
| KG | / | 72 | 129 | 268 | 430 | 751 | 1044 | / | / | / | / | / | |
| AUR = Available Upon Request | |||||||||||||
Piston Check Valves - API 6D
Sizes: 2" - 12"
Class: 1500
| SIZE | IN | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MM | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A - RF | IN | 13.625 | 17.25 | 20.25 | 24 | 32.375 | 34.375 | 41 | / | / | / | / | / |
| MM | 346 | 438 | 514 | 610 | 822 | 873 | 1041 | / | / | / | / | / | |
| A - RTJ | IN | 13.75 | 17.325 | 20.375 | 24.25 | 32.75 | 35 | 41.675 | / | / | / | / | / |
| MM | 349 | 440 | 518 | 616 | 832 | 889 | 1059 | / | / | / | / | / | |
| A - BW | IN | AUR | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / |
| MM | AUR | AUR | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / | |
| H1 | IN | 3.25 | 5.25 | 5.375 | 7 | 9.25 | 11.75 | 13.125 | / | / | / | / | / |
| MM | 83 | 133 | 137 | 178 | 235 | 298 | 333 | / | / | / | / | / | |
| H2 | IN | 8.5 | 10.25 | 12.125 | 18 | 20.25 | 24.25 | 25.125 | / | / | / | / | / |
| MM | 216 | 260 | 308 | 457 | 514 | 616 | 638 | / | / | / | / | / | |
| WEIGHT (RF) |
LB | 111 | 207 | 362 | 803 | 1320 | 2183 | 2301 | / | / | / | / | / |
| KG | 50 | 94 | 164 | 364 | 599 | 990 | 1044 | / | / | / | / | / | |
| AUR = Available Upon Request | |||||||||||||
Piston Check Valves - API 6D
Sizes: 2" - 12"
Class: 2500
| SIZE | NPS | 2 | 3 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DN | 50 | 80 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| A - RF | IN | 14.875 | 20.25 | 23.125 | 32 | 37.375 | / | / | / | / | / | / | / |
| MM | 378 | 512 | 587 | 813 | 949 | / | / | / | / | / | / | / | |
| A - RTJ | IN | 15 | 20.5 | 23.5 | 32.5 | 38 | / | / | / | / | / | / | / |
| MM | 381 | 521 | 597 | 826 | 965 | / | / | / | / | / | / | / | |
| A - BW | IN | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / | / | / |
| MM | AUR | AUR | AUR | AUR | AUR | / | / | / | / | / | / | / | |
| H1 | IN | 3.25 | 5.25 | 5.375 | 7 | 9.25 | / | / | / | / | / | / | / |
| MM | 83 | 133 | 137 | 178 | 235 | / | / | / | / | / | / | / | |
| H2 | IN | 8.5 | 10.25 | 12.125 | 18 | 20.25 | / | / | / | / | / | / | / |
| MM | 216 | 260 | 308 | 457 | 514 | / | / | / | / | / | / | / | |
| WEIGHT (RF) |
LB | 151 | 320 | 513 | 1327 | 2068 | / | / | / | / | / | / | / |
| KG | 68 | 145 | 233 | 602 | 938 | / | / | / | / | / | / | / | |
| AUR - Available Upon Request | |||||||||||||
Check Valves Detail
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