Trusted Dual Plate Check Valve Manufacturer
NTVAL provides durable Dual Plate Check Valves designed for efficient and reliable operation in demanding applications. Engineered to prevent backflow and protect your system, our valves offer cost-effective solutions that meet industry standards.
Reliable Dual Plate Check Valve
The Dual Plate Check Valve prevents reverse flow in pipelines, keeping liquids or gases moving in the intended direction. It uses two spring-loaded plates that open with forward flow and close quickly if flow reverses, effectively stopping backflow without disrupting overall flow.
Industries such as water distribution, oil and gas, and chemical processing commonly use this valve for its reliable function and compact, lightweight design. Easy to install, the dual-plate setup provides stability and durability, making it suitable for a range of applications that need dependable flow control.
Get More Versatile Valve
Specification
- Spring Loaded
- Size Range: NPS 2 to NPS 48
- Pressure Range: 150LB to 2500LB
- Design STD.: API594/ API6D
- Dual Plate Check Valve Manufacturer & Supplier
Dual Plate Check Valve Design Features
Main Parts Materials
Carbon Steel
| BODY | DISC | BODY SEAT | DISC SEAT | SPRING | WETTED PARTS | |
| A216 Gr.WCB | A351 Gr.CF8M | Same as Body | Same asDisc | Inconel X-750 | 316 SS | |
| A216 Gr.WCB | A351 Gr.CF8M | Viton | Same asDisc | Inconel X-750 | 316 SS | |
| A216 Gr.WCB | A351 Gr.CF8M | Stellite overlay | Same asDisc | Inconel X-750 | 316 SS | |
| A216 Gr.WCB | A217 Gr.CA15 | 410SS overlay | Same asDisc | Inconel X-750 | 410 SS | |
| A216 Gr.WCB | A217 Gr.CA15 | Stellite overlay | Same asDisc | Inconel X-750 | 410 SS | |
Low Temperature Carbon Steel
| BODY | DISC | BODY SEAT | DISC SEAT | SPRING | WETTED PARTS | |
| A352 Gr.LCC | A351 Gr.CF8M | Same as Body | Same asDisc | Inconel X-750 | 316 SS | |
| A352 Gr.LCC | A351 Gr.CF8M | Buna-N | Same asDisc | Inconel X-750 | 316 SS | |
| A352 Gr.LCC | A351 Gr.CF8M | Stellite overlay | Same asDisc | Inconel X-750 | 316 SS | |
Stainless Steel
| BODY | DISC | BODY SEAT | DISC SEAT | SPRING | WETTED PARTS |
| A351 Gr.CF8M | A351 Gr.CF8M | Same as Body | Same asDisc | Inconel X-750 | 316 SS |
| A351 Gr.CF8M | A351 Gr.CF8M | Viton | Same asDisc | Inconel X-750 | 316 SS |
| A351 Gr.CF8M | A351 Gr.CF8M | Stellite overlay | Same as Disc | Inconel X-750 | 316 SS |
Flow Volume vs Pressure Drop
Friction Factor Flow Coefficiency
| SIZE | Friction Factor | FlowCoefficiency | Flow Direction | |||
| UnderValveFullOPENξ | Under Standard Temp. | |||||
| (in.) | Cv | Kv | Cv(U.S) | Cv(U.k) | Approx.Open | Pressure KPa |
| 2 | 2.6 | 63 | 74 | 62 | 2 | 1 |
| 2-1/2 | 2.4 | 109 | 128 | 107 | 2 | 1 |
| 3 | 2.3 | 172 | 201 | 169 | 2 | 1 |
| 4 | 2 | 289 | 338 | 283 | 2 | 1 |
| 5 | 1.8 | 476 | 557 | 466 | 2 | 1 |
| 6 | 1.5 | 750 | 878 | 735 | 2 | 1 |
| 8 | 1.3 | 1432 | 1675 | 1403 | 2 | 1 |
| 10 | 1.2 | 2330 | 2726 | 2283 | 2 | 1 |
| 12 | 1 | 3676 | 4301 | 3602 | 2 | 1 |
| 14 | 0.9 | 5274 | 6171 | 5169 | 2 | 1 |
| 16 | 0.8 | 7306 | 8548 | 7160 | 3 | 1 |
| 18 | 0.8 | 9246 | 10818 | 9061 | 3 | 1 |
| 20 | 0.8 | 11415 | 13356 | 11187 | 3 | 1 |
| 24 | 0.7 | 17573 | 20560 | 17222 | 3 | 1 |
| 28 | 0.7 | 23919 | 27985 | 23441 | 4 | 1 |
| 30 | 0.7 | 27458 | 32126 | 26909 | 4 | 1 |
| 32 | 0.7 | 31241 | 36552 | 30616 | 4 | 1 |
| 36 | 0.7 | 39539 | 46261 | 38748 | 4 | 1 |
| 40 | 0.7 | 48814 | 57112 | 47838 | 4 | 1 |
| 42 | 0.7 | 53817 | 62966 | 52741 | 4 | 1 |
| 48 | 0.7 | 70292 | 82242 | 68886 | 4 | 1 |
Wafer Dual Plate Check Valve
Class 150 Dimension
- Cast Steel Check Valve, Wafer Ends, Dual Plates
- Spring Loaded, Horizontal or Vertical Lines
- Designed to API594.API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL150 |
Class 150 Dimension
| STUD/BOLTING DETAILS | |||||||||||
| SIZE (in.) | L | D1 | D2 | W.T(kg) | D3 | NO. | DIA. | LENGTH | |||
| in | mm | RF | RTJ Unit:mm | ||||||||
| 1-1/2 | 60 | 83 | 38 | 45 | 2 | 98.5 | 4 | 1/2 | M14 | 130 | 145 |
| 2 | 60 | 103 | 51 | 56 | 2 | 120.5 | 4 | 5/8 | M16 | 140 | 155 |
| 2-1/2 | 67 | 122 | 65 | 73 | 3 | 139.5 | 4 | 5/8 | M16 | 150 | 165 |
| 3 | 73 | 135 | 80 | 88 | 4 | 152.5 | 4 | 5/8 | M16 | 160 | 175 |
| 4 | 73 | 173 | 102 | 108 | 6 | 190.5 | 8 | 5/8 | M16 | 170 | 185 |
| 5 | 86 | 195 | 127 | 132 | 8 | 216 | 8 | 3/4 | M20 | 190 | 205 |
| 6 | 98 | 220 | 152 | 160 | 12 | 241.5 | 8 | 3/4 | M20 | 205 | 220 |
| 8 | 127 | 277 | 203 | 210 | 25 | 298.5 | 8 | 3/4 | M20 | 240 | 255 |
| 10 | 146 | 337 | 254 | 266 | 38 | 362 | 12 | 7/8 | M24 | 270 | 285 |
| 12 | 181 | 407 | 305 | 310 | 52 | 432 | 12 | 7/8 | M24 | 310 | 325 |
| 14 | 184 | 448 | 350 | 355 | 80 | 476 | 12 | 1 | M27 | 325 | 340 |
| 16 | 191 | 512 | 400 | 405 | 115 | 540 | 16 | 1 | M27 | 340 | 355 |
| 18 | 203 | 547 | 450 | 455 | 138 | 578 | 16 | 1-1/8 | M30 | 365 | 380 |
| 20 | 219 | 604 | 500 | 505 | 162 | 635 | 20 | 1-1/8 | M30 | 385 | 400 |
| 24 | 222 | 715 | 600 | 605 | 330 | 749.5 | 20 | 1-1/4 | M33 | 405 | 420 |
| 26 | 222 | 722 | 633 | 650 | 360 | 744.5 | 36 | 3/4 | M20 | 365 | – |
| 28 | 305 | 773 | 700 | 700 | 380 | 795.5 | 40 | 3/4 | M20 | 455 | – |
| 30 | 305 | 824 | 746 | 750 | 420 | 846 | 44 | 3/4 | M20 | 455 | – |
| 32 | 305 | 878 | 796 | 800 | 260 | 900 | 48 | 3/4 | M20 | 460 | – |
| 36 | 368 | 983 | 874 | 894 | 630 | 1009.5 | 44 | 7/8 | M24 | 540 | – |
| 40 | 432 | 1090 | 976 | 985 | 870 | 1120.5 | 44 | 1 | M27 | 620 | – |
| 42 | 432 | 1142 | 1050 | 1055 | 960 | 1171.5 | 48 | 1 | M27 | 625 | – |
| 44 | 432 | 1193 | 1070 | 1070 | 1140 | 1222 | 52 | 1 | M27 | 630 | – |
| 48 | 524 | 1302 | 1200 | 1205 | 1400 | 1335 | 44 | 1-1/8 | M30 | 740 | – |
| 54 | 591 | 1460 | 1312 | 1315 | 2240 | 1492 | 44 | 1-1/8 | M30 | 820 | – |
| 56 | 591 | 1512 | 1360 | 1370 | 2830 | 1543 | 60 | 1-1/8 | M30 | 820 | – |
| 60 | 660 | 1628 | 1458 | 1470 | 3200 | 1662 | 52 | 1-1/4 | M33 | 900 | – |
Class 300 Dimension
- Cast Steel Check Valve, Wafer Ends, Dual Plates
- Spring Loaded, Horizontal or Vertical Lines
- Designed to API594,API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL300 |
Class 300 Dimension
| STUD/BOLTING DETAILS | |||||||||||
| SIZE (in.) | L | D1 | D2 | W.T(kg) | D3 | NO. | DIA. | LENGTH | |||
| in | mm | RF | RTJ Unit:mm | ||||||||
| 2 | 60 | 110 | 51 | 58 | 3 | 127 | 8 | 5/8 | M16 | 155 | 175 |
| 2-1/2 | 67 | 128 | 65 | 73 | 4 | 149 | 8 | 3/4 | M20 | 175 | 195 |
| 3 | 73 | 147 | 80 | 88 | 6 | 168.5 | 8 | 3/4 | M20 | 190 | 210 |
| 4 | 73 | 179 | 102 | 108 | 8 | 200 | 8 | 3/4 | M20 | 195 | 215 |
| 5 | 86 | 214 | 127 | 132 | 12 | 235 | 8 | 3/4 | M20 | 215 | 235 |
| 6 | 98 | 249 | 152 | 160 | 18 | 270 | 12 | 3/4 | M20 | 230 | 250 |
| 8 | 127 | 305 | 203 | 210 | 30 | 330 | 12 | 7/8 | M24 | 280 | 300 |
| 10 | 146 | 359 | 254 | 266 | 50 | 387.5 | 16 | 1 | M27 | 315 | 335 |
| 12 | 181 | 420 | 305 | 310 | 75 | 451 | 16 | 1-1/8 | M30 | 365 | 385 |
| 14 | 222 | 483 | 350 | 355 | 115 | 514.5 | 20 | 1-1/8 | M30 | 410 | 430 |
| 16 | 232 | 537 | 400 | 405 | 190 | 571.5 | 20 | 1-1/4 | M33 | 435 | 455 |
| 18 | 264 | 594 | 450 | 455 | 200 | 628.5 | 24 | 1-1/4 | M33 | 475 | 495 |
| 20 | 292 | 652 | 500 | 505 | 260 | 686 | 24 | 1-1/4 | M33 | 510 | 535 |
| 24 | 318 | 772 | 600 | 608 | 410 | 813 | 24 | 1-1/2 | M39x3 | 560 | 585 |
| 26 | 356 | 767 | 633 | 640 | 560 | 803 | 32 | 1-1/4 | M33 | 625 | – |
| 28 | 368 | 821 | 685 | 685 | 580 | 857 | 36 | 1-1/4 | M33 | 635 | – |
| 30 | 368 | 882 | 735 | 740 | 660 | 921 | 36 | 1-3/8 | M39x3 | 650 | – |
| 32 | 368 | 936 | 784 | 784 | 970 | 978 | 32 | 1-1/2 | M39x3 | 675 | – |
| 36 | 483 | 1044 | 873 | 880 | 1010 | 1089 | 32 | 1-5/8 | M42x3 | 800 | – |
| 40 | 546 | 1146 | 976 | 985 | 1420 | 1191 | 40 | 1-5/8 | M42x3 | 885 | – |
| 42 | 568 | 1196 | 1035 | 1045 | 1540 | 1244.5 | 36 | 1-3/4 | M45x3 | 920 | – |
| 48 | 629 | 1365 | 1166 | 1190 | 2250 | 1416 | 40 | 1-718 | M48x3 | 1010 | – |
| 54 | 718 | 1526 | 1312 | 1315 | 3100 | 1578 | 48 | 1-718 | M48x3 | 1140 | – |
| 60 | 838 | 1704 | 1458 | 1470 | 4310 | 1764 | 40 | 2-1/4 | M56x3 | 1280 | – |
| *26″and larger are available with ASMEIANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605). | |||||||||||
Class 600/900 Dimension
- Cast Steel Check Valve, Wafer Ends, Dual Plates
- Spring Loaded, Horizontal or Vertical Lines
- Designed to API594,API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL600/900 |
Class 600 Dimension
| |||||||||||
STUD/BOLTING DETAILS | |||||||||||
SIZE (in.) | L | D1 | D2 | W.T(kg) | D3 | NO. | DIA. | LENGTH | |||
in | mm | RF | RTJ Unit:mm | ||||||||
2 | 60 | 110 | 51 | 58 | 4 | 127.0 | 8 | 5/8 | M16 | 175 | 180 |
2-12 | 67 | 128 | 65 | 73 | 5 | 149 | 8 | 3/4 | M20 | 195 | 200 |
3 | 73 | 147 | 80 | 88 | 8 | 168.5 | 8 | 3/4 | M20 | 210 | 215 |
4 | 79 | 191 | 102 | 108 | 11 | 216 | 8 | 7/8+ | M24 | 235 | 240 |
5 | 105 | 239 | 127 | 136 | 20 | 267 | 8 | 1 | M27 | 280 | 285 |
6 | 136 | 264 | 152 | 162 | 25 | 292 | 12 | 1 | M27 | 320 | 325 |
8 | 165 | 318 | 200 | 212 | 50 | 349 | 12 | 1-1/8 | M30 | 370 | 375 |
10 | 213 | 398 | 250 | 266 | 90 | 432 | 16 | 1-1/4 | M33 | 440 | 445 |
12 | 229 | 455 | 305 | 312 | 140 | 489 | 20 | 1-1/4 | M33 | 460 | 465 |
14 | 273 | 490 | 337 | 355 | 220 | 527 | 20 | 1-3/8 | M36x3 | 520 | 525 |
16 | 305 | 562 | 387 | 400 | 360 | 603 | 20 | 1-1/2 | M39x3 | 575 | 580 |
18 | 362 | 610 | 438 | 450 | 380 | 654 | 20 | 1-5/8 | M42x3 | 650 | 655 |
20 | 368 | 680 | 489 | 500 | 510 | 724 | 24 | 1-5/8 | M42X3 | 670 | 680 |
24 | 438 | 786 | 591 | 600 | 830 | 838 | 24 | 1-7/8 | M48x3 | 780 | 795 |
Class 900 Dimension
| |||||||||||
STUD/BOLTING DETAILS | |||||||||||
SIZE (in.) | L | D1 | D2 | W.T(kg) | D3 | NO. | DIA. | LENGTH | |||
in | mm | RF | RTJ Unit:mm | ||||||||
2 | 70 | 140 | 51 | 58 | 8 | 165.0 | 8 | 7/8 | M24 | 225 | 230 |
2-1/2 | 83 | 162 | 65 | 73 | 10 | 190.5 | 8 | 1 | M27 | 250 | 255 |
3 | 83 | 165 | 80 | 90 | 14 | 190.5 | 8 | 7/8 | M24 | 240 | 245 |
4 | 102 | 204 | 102 | 108 | 20 | 235 | 8 | 1-1/8 | M30 | 285 | 290 |
5 | 110 | 245 | 127 | 136 | 30 | 279.5 | 8 | 1-1/4 | M33 | 310 | 315 |
6 | 159 | 286 | 150 | 162 | 40 | 317.5 | 12 | 1-1/8 | M30 | 365 | 370 |
8 | 206 | 356 | 200 | 212 | 80 | 393.5 | 12 | 1-3/8 | M36x3 | 440 | 445 |
10 | 241 | 432 | 250 | 266 | 140 | 470 | 16 | 1-3/8 | M36x3 | 490 | 495 |
12 | 292 | 495 | 305 | 312 | 220 | 533.5 | 20 | 1-3/8 | M36x3 | 560 | 565 |
14 | 356 | 518 | 337 | 355 | 350 | 559 | 20 | 1-1/2 | M39x3 | 645 | 655 |
16 | 384 | 572 | 387 | 400 | 470 | 616 | 20 | 1-5/8 | M42X3 | 685 | 695 |
18 | 451 | 635 | 438 | 450 | 600 | 686 | 20 | 1-7/8 | M48x3 | 790 | 805 |
20 | 451 | 695 | 487 | 496 | 820 | 749.5 | 20 | 2 | M52X3 | 810 | 825 |
24 | 495 | 835 | 591 | 600 | 1050 | 901.5 | 20 | 2-1/2 | M64x3 | 945 | 965 |
*26″and larger are available with ASME/ANSIB16.47 end flanges,either Style Aor Style B(formerly MSS SP-44and API 605). | |||||||||||
Class 1500 Dimension
- Cast Steel Check Valve, Wafer Ends, Dual Plates
- Spring Loaded, Horizontal or Vertical Lines
- Designed to API594,API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL 1500 |
Class 1500 Dimension
| STUD/BOLTING DETAILS | |||||||||||
| SIZE (in.) | L | D1 | D2 | W.T(kg) | D3 | NO. | DIA. | LENGTH | |||
| in | mm | RF | RTJ Unit:mm | ||||||||
| 2 | 70 | 140 | 51 | 58 | 8 | 165.0 | 8 | 7/8 | M24 | 225 | 230 |
| 2-1/2 | 83 | 162 | 65 | 73 | 10 | 190.5 | 8 | 1 | M27 | 250 | 255 |
| 3 | 83 | 172 | 80 | 90 | 18 | 203 | 8 | 1-1/8 | M30 | 270 | 275 |
| 4 | 102 | 207 | 102 | 108 | 25 | 241.5 | 8 | 1-1/4 | M33 | 310 | 315 |
| 5 | 110 | 252 | 127 | 136 | 50 | 292 | 8 | 1-1/2 | M39x3 | 370 | 375 |
| 6 | 159 | 280 | 150 | 162 | 65 | 317.5 | 12 | 1-3/8 | M36x3 | 430 | 440 |
| 8 | 206 | 350 | 200 | 212 | 130 | 393.5 | 12 | 1-5/8 | M42x3 | 510 | 520 |
| 10 | 248 | 433 | 254 | 266 | 210 | 482.5 | 12 | 1-7/8 | M48x3 | 600 | 610 |
| 12 | 305 | 518 | 305 | 312 | 380 | 571.5 | 16 | 2 | M52x3 | 695 | 715 |
| 14 | 356 | 576 | 337 | 355 | 550 | 635 | 16 | 2-1/4 | M56x3 | 775 | 800 |
| 16 | 384 | 639 | 387 | 400 | 630 | 705 | 16 | 2-1/2 | M64x3 | 850 | 880 |
| 18 | 468 | 701 | 430 | 438 | 790 | 774.5 | 16 | 1-3/4 | M70x3 | 955 | 985 |
| 20 | 533 | 753 | 478 | 487 | 1270 | 832 | 16 | 3 | M76x3 | 1065 | 1095 |
| 24 | 559 | 897 | 570 | 578 | 2710 | 990.5 | 16 | 3-1/2 | M90x3 | 1170 | 1205 |
| *26″and larger are available with ASMEIANSIB16.47end flanges,either Style Aor Style B(formerly MSSSP-44 and API605). | |||||||||||
Lug Dual Plate Check Valve
Class 150 Dimension
- Cast Steel Check Valve, Wafer Ends
- Dual Plates, Fully Lugged, Spring Loaded
- Horizontal or Vertical Lines
- Designed to AP594,API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL 150 |
Class 150 Dimension
| STUD/BOLTING DETAILS | ||||||||||||||
| SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | |||||||||
| 2 | 60 | 120.5 | 92 | 51 | 56 | 4 | 3/4 | 19 | 4 | 5/8 | M16 | 140 | 155 | |
| 2-1/2 | 67 | 139.5 | 105 | 65 | 7 | 5.5 | 3/4 | 19 | 4 | 5/8 | M16 | 150 | 165 | |
| 3 | 73 | 152.5 | 127 | 80 | 88 | 7 | 3/4 | 19 | 4 | 5/8 | M16 | 160 | 175 | |
| 4 | 73 | 190.5 | 157 | 102 | 108 | 11 | 3/4 | 19 | 8 | 5/8 | M16 | 170 | 185 | |
| 5 | 86 | 216 | 186 | 127 | 132 | 15 | 7/8 | 22 | 8 | 3/4 | M20 | 190 | 205 | |
| 6 | 98 | 241.5 | 216 | 152 | 160 | 19 | 7/8 | 22 | 8 | 3/4 | M20 | 205 | 220 | |
| 8 | 127 | 298.8 | 270 | 203 | 210 | 36 | 7/8 | 22 | 8 | 3/4 | M20 | 240 | 255 | |
| 10 | 146 | 362 | 324 | 254 | 266 | 61 | 1 | 25 | 12 | 718 | M24 | 270 | 285 | |
| 12 | 181 | 432 | 381 | 305 | 310 | 119 | 1 | 25 | 12 | 7/8 | M24 | 310 | 325 | |
| 14 | 184 | 476 | 413 | 350 | 355 | 131 | 1-1/8 | 29 | 12 | 1 | M27 | 325 | 340 | |
| 16 | 191 | 540 | 470 | 400 | 405 | 180 | 1-1/8 | 29 | 16 | 1 | M27 | 340 | 355 | |
| 18 | 203 | 578 | 533 | 450 | 455 | 203 | 1-1/4 | 32 | 16 | 1-1/8 | M30 | 365 | 380 | |
| 20 | 219 | 635 | 584 | 500 | 505 | 275 | 1-1/4 | 32 | 20 | 1-1/8 | M30 | 385 | 400 | |
| 24 | 222 | 749.5 | 692 | 600 | 605 | 314 | 1-1/4 | 35 | 20 | 1-1/4 | M33 | 405 | 420 | |
| 28 | 305 | 795.5 | 762 | 700 | 700 | 910 | 718 | 22 | 40 | 3/4 | M20 | 455 | – | |
| 30 | 305 | 846 | 813 | 746 | 750 | 1025 | 7/8 | 22 | 44 | 3/4 | M20 | 455 | – | |
| 32 | 305 | 900 | 864 | 796 | 800 | 1344 | 718 | 22 | 48 | 3/4 | M20 | 460 | – | |
| 36 | 368 | 1009.5 | 972 | 898 | 910 | 1536 | 1 | 25 | 44 | 7/8 | M24 | 540 | – | |
| 42 | 432 | 1171.5 | 1130 | 1050 | 1055 | 2310 | 1-1/8 | 29 | 48 | 1 | M27 | 625 | – | |
| 48 | 524 | 1335 | 1289 | 1200 | 1205 | 3364 | 1-1/4 | 32 | 44 | 1-1/8 | M30 | 740 | – | |
| *26″and larger are available with ASME/ANSIB16.47end flanges,either Style Aor Style B (formerly MSS SP-44 and API605). | ||||||||||||||
Class 300 Dimension
- Cast Steel Check Valve, Wafer Ends
- Dual Plates, Fully Lugged, Spring Loaded
- Horizontal or Vertical Lines
- Designed to AP594,API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL300 |
Class 300 Dimension
| STUD/BOLTING DETAILS | ||||||||||||||
| SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | |||||||||
| 2 | 60 | 127 | 92 | 51 | 58 | 6 | 3/4 | 19 | 8 | 5/8 | M16 | 155 | 175 | |
| 2-1/2 | 67 | 149 | 105 | 65 | 73 | 7 | 7/8 | 22 | 8 | 3/4 | M20 | 175 | 195 | |
| 3 | 73 | 168.5 | 127 | 80 | 88 | 10 | 7/8 | 0 | 8 | 3/4 | M20 | 190 | 210 | |
| 4 | 73 | 200 | 157 | 102 | 108 | 16 | 7/8 | 22 | 8 | 3/4 | M20 | 175 | 215 | |
| 5 | 86 | 235 | 186 | 127 | 132 | 29 | 7/8 | 22 | 8 | 3/4 | M20 | 215 | 235 | |
| 6 | 98 | 270 | 216 | 152 | 160 | 32 | 7/8 | 22 | 12 | 3/4 | M20 | 230 | 250 | |
| 8 | 127 | 330 | 270 | 203 | 210 | 55 | 1 | 25 | 12 | 7/8 | M24 | 280 | 300 | |
| 10 | 146 | 387.5 | 324 | 254 | 266 | 82 | 1-1/8 | 29 | 16 | 1 | M27 | 315 | 335 | |
| 12 | 181 | 451 | 381 | 305 | 310 | 92 | 1-1/4 | 32 | 16 | 1-1/8 | M30 | 365 | 385 | |
| 14 | 222 | 514.5 | 413 | 350 | 355 | 251 | 1-1/4 | 32 | 20 | 1-1/8 | M30 | 410 | 430 | |
| 16 | 232 | 571.5 | 470 | 405 | 405 | 342 | 1-3/8 | 35 | 20 | 1-1/4 | M33 | 435 | 455 | |
| 18 | 264 | 628.5 | 533 | 455 | 455 | 391 | 1-3/8 | 35 | 24 | 1-1/4 | M33 | 475 | 495 | |
| 20 | 292 | 686 | 584 | 505 | 505 | 536 | 1-3/8 | 35 | 24 | 1-1/4 | M33 | 510 | 535 | |
| 24 | 318 | 813 | 692 | 608 | 608 | 833 | 1-5/8 | 41 | 24 | 1-1/2 | M39 | 560 | 585 | |
| 30 | 368 | 921 | 845 | 735 | 740 | 1395 | 1-1/2 | 38 | 36 | 1-3/8 | M36 | 650 | – | |
| 36 | 483 | 1089 | 1010 | 873 | 880 | 1862 | 1-3/4 | 45 | 32 | 1-5/8 | M42 | 800 | – | |
| 42 | 568 | 1245 | 1168 | 1035 | 1045 | 3861 | 1-7/8 | 48 | 36 | 1-3/4 | M45 | 920 | – | |
| 48 | 629 | 1416 | 1327 | 1179 | 1190 | 4370 | 2 | 51 | 40 | 1-7/8 | M48 | 1010 | – | |
| *26″and larger are available with ASMEIANSIB16.47end flanges,either Style Aor Style B(formerlyMSS SP-44 and API605). | ||||||||||||||
Class 600/900 Dimension
- Cast Steel Check Valve, Wafer Ends
- Dual Plates, Fully Lugged, Spring Loaded
- Horizontal or Vertical Lines
- Designed to AP1594.API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL600/900 |
Class 600 Dimension
STUD/BOLTING DETAILS | ||||||||||||||
SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
in | mm | in. | mm | RF | RJ | |||||||||
2 | 60 | 127 | 92 | 51 | 58 | 6.5 | 3/4 | 19 | 8 | 5/8 | M16 | 175 | 180 | |
2-1/2 | 67 | 149 | 100 | 65 | 73 | 8 | 7/8 | 22 | 8 | 3/4 | M20 | 195 | 200 | |
3 | 73 | 168 | 127 | 80 | 88 | 10 | 7/8 | 22 | 8 | 3/4 | M20 | 210 | 215 | |
4 | 79 | 216 | 157 | 102 | 108 | 21 | 1 | 25 | 8 | 7/8 | M24 | 235 | 240 | |
5 | 105 | 266.5 | 186 | 127 | 136 | 41 | 1-1/8 | 29 | 8 | 1 | M27 | 280 | 285 | |
6 | 136 | 292 | 216 | 152 | 162 | 57 | 1-1/8 | 29 | 12 | 1 | M27 | 320 | 325 | |
8 | 165 | 349 | 270 | 200 | 212 | 94 | 1-1/8 | 32 | 12 | 1-1/8 | M30 | 370 | 375 | |
10 | 213 | 432 | 324 | 250 | 266 | 164 | 1-3/8 | 35 | 16 | 1-1/4 | M33 | 440 | 445 | |
12 | 229 | 489 | 381 | 305 | 312 | 213 | 1-3/8 | 35 | 20 | 1-1/4 | M33 | 460 | 465 | |
14 | 273 | 527 | 413 | 337 | 355 | 343 | 1-1/2 | 38 | 20 | 1-3/8 | M36 | 520 | 525 | |
16 | 305 | 603 | 470 | 387 | 400 | 476 | 1-5/8 | 41 | 20 | 1-1/2 | M39 | 575 | 580 | |
18 | 362 | 654 | 533 | 438 | 450 | 685 | 1-3/4 | 44 | 20 | 1-5/8 | M42 | 650 | 655 | |
20 | 368 | 724 | 584 | 489 | 500 | 908 | 1-3/4 | 44 | 24 | 1-5/8 | M42 | 670 | 680 | |
24 | 438 | 838 | 692 | 591 | 600 | 1088 | 2 | 52 | 24 | 1-7/8 | M48 | 780 | 790 | |
Class 900 Dimension
STUD/BOLTING DETAILS | ||||||||||||||
SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
in | mm | in. | mm | RF | RJ | |||||||||
2 | 70 | 165.1 | 92 | 51 | 58 | 13 | 1 | 26 | 8 | 7/8 | M24 | 225 | 230 | |
2-1/2 | 83 | 190.5 | 105 | 65 | 73 | 18 | 1-1/8 | 29 | 8 | 1 | M27 | 250 | 255 | |
3 | 83 | 190.5 | 127 | 80 | 90 | 21 | 1 | 26 | 8 | 7/8 | M24 | 240 | 245 | |
4 | 102 | 234.9 | 157 | 102 | 108 | 36 | 1-1/4 | 32 | 8 | 1-1/8 | M30 | 285 | 290 | |
5 | 110 | 279.4 | 186 | 127 | 136 | 65 | 1-3/8 | 35 | 8 | 1-1/4 | M33 | 310 | 315 | |
6 | 159 | 317.5 | 216 | 150 | 162 | 92 | 1-1/4 | 32 | 12 | 1-1/8 | M30 | 365 | 370 | |
8 | 206 | 393.7 | 270 | 200 | 212 | 174 | 1-1/2 | 39 | 12 | 1-3/8 | M36 | 440 | 445 | |
10 | 241 | 469.9 | 324 | 250 | 266 | 264 | 1-1/2 | 39 | 16 | 1-3/8 | M36 | 490 | 495 | |
12 | 292 | 533.4 | 381 | 305 | 312 | 211 | 1-1/2 | 39 | 20 | 1-3/8 | M36 | 560 | 565 | |
14 | 356 | 558.8 | 413 | 337 | 355 | 612 | 1-5/8 | 42 | 20 | 1-1/2 | M39 | 645 | 655 | |
16 | 384 | 615.9 | 470 | 387 | 400 | 712 | 1-3/4 | 45 | 20 | 1-5/8 | M42 | 685 | 695 | |
18 | 451 | 685.8 | 533 | 438 | 450 | 1160 | 2 | 51 | 20 | 1-7/8 | M48 | 790 | 805 | |
20 | 451 | 749.3 | 584 | 487 | 496 | 1568 | 2-1/8 | 54 | 20 | 2 | M52 | 810 | 825 | |
24 | 495 | 901.7 | 692 | 591 | 600 | 1881 | 2-5/8 | 67 | 20 | 2-1/2 | M64 | 945 | 965 | |
Class 1500 Dimension
- Cast Steel Check Valve, Wafer Ends
- Dual Plates, Fully Lugged, Spring Loaded
- Horizontal or Vertical Lines
- Designed API594.API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL1500 |
Class 1500 Dimension
| STUD/BOLTING DETAILS | ||||||||||||||
| SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | |||||||||
| 2 | 70 | 165.1 | 58 | 92 | 51 | 14 | 1 | 26 | 8 | 7/8 | M24 | 225 | 230 | |
| 2-1/2 | 83 | 190.5 | 73 | 105 | 65 | 19 | 1-1/8 | 29 | 8 | 1 | M27 | 250 | 255 | |
| 3 | 83 | 203.2 | 90 | 127 | 80 | 25 | 1-1/4 | 32 | 8 | 1-1/8 | M30 | 270 | 275 | |
| 4 | 102 | 241.3 | 108 | 157 | 102 | 43 | 1-3/8 | 35 | 8 | 1-1/4 | M33 | 310 | 315 | |
| 5 | 110 | 292.1 | 136 | 186 | 127 | 72 | 1-5/8 | 42 | 8 | 1-1/2 | M39 | 370 | 375 | |
| 6 | 159 | 317.5 | 162 | 216 | 150 | 101 | 1-1/2 | 39 | 12 | 1-3/8 | M36 | 430 | 440 | |
| 8 | 206 | 393.7 | 212 | 270 | 200 | 240 | 1-3/4 | 45 | 12 | 1-5/8 | M42 | 510 | 520 | |
| 10 | 248 | 482.6 | 266 | 324 | 254 | 306 | 2 | 51 | 12 | 1-7/8 | M48 | 600 | 610 | |
| 12 | 305 | 571.5 | 312 | 381 | 305 | 541 | 2-1/8 | 54 | 16 | 2 | M52 | 695 | 715 | |
| 14 | 356 | 635 | 355 | 413 | 337 | 932 | 2-3/8 | 61 | 16 | 2-1/4 | M56 | 775 | 800 | |
| 16 | 384 | 704.8 | 400 | 470 | 387 | 980 | 2-5/8 | 67 | 16 | 2-1/2 | M64 | 850 | 880 | |
| *26″and larger are available with ASME/ANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605). | ||||||||||||||
Flanged Dual Plate Check Valve
Class 150/300 Dimension
- Cast Steel Check Valve, Double Flanged Ends
- Dual Plates, Spring Loaded
- Horizontal or Vertical Lines
- Designed to API594.API6D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL150/300 |
Class 150/300 Dimension
| CLASS 150 DIMENSION | ||||||||||||||
| STUD/BOLTING DETAILS | ||||||||||||||
| SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | |||||||||
| 8 | 127 | 343 | 298.5 | 203 | 270 | 210 | 63 | 7/8 | 22 | 8 | 3/4 | M20 | 120 | 135 |
| 10 | 146 | 406 | 362 | 254 | 324 | 266 | 93 | 1 | 25 | 12 | 7/8 | M24 | 135 | 150 |
| 12 | 181 | 483 | 432 | 305 | 381 | 310 | 170 | 1 | 25 | 12 | 7/8 | M24 | 135 | 150 |
| 14 | 184 | 533 | 476 | 350 | 413 | 355 | 199 | 1-1/8 | 29 | 12 | 1 | M27 | 145 | 160 |
| 16 | 191 | 597 | 540 | 400 | 470 | 405 | 246 | 1-1/8 | 29 | 16 | 1 | M27 | 155 | 170 |
| 18 | 203 | 635 | 578 | 450 | 533 | 455 | 290 | 1-1/4 | 32 | 16 | 1-1/8 | M30 | 165 | 180 |
| 20 | 219 | 699 | 635 | 500 | 584 | 505 | 348 | 1-1/4 | 32 | 20 | 1-1/8 | M30 | 170 | 185 |
| 24 | 222 | 813 | 749.5 | 600 | 692 | 605 | 396 | 1-1/4 | 35 | 20 | 1-1/4 | M33 | 185 | 200 |
| 28 | 305 | 837 | 795.5 | 700 | 762 | 700 | 1270 | 7/8 | 22 | 40 | 3/4 | M20 | 205 | |
| 30 | 305 | 887 | 846 | 746 | 813 | 750 | 1987 | 7/8 | 22 | 44 | 3/4 | M20 | 210 | |
| 32 | 305 | 941 | 900 | 796 | 864 | 800 | 2925 | 7/8 | 22 | 48 | 3/4 | M20 | 225 | |
| 36 | 368 | 1057 | 1009.5 | 898 | 972 | 910 | 1430 | 1 | 25 | 44 | 7/8 | M24 | 250 | |
| 42 | 432 | 1226 | 1171.5 | 1050 | 1130 | 1055 | 2377 | 1-1/8 | 29 | 48 | 1 | M27 | 275 | |
| 48 | 524 | 1392 | 1335 | 1200 | 1289 | 1205 | 4174 | 1-1/4 | 32 | 44 | 1-1/8 | M30 | 305 | |
| CLASS 300 DIMENSION | ||||||||||||||
| STUD/BOLTING DETAILS | ||||||||||||||
| SIZE (in.) | L | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| 8 | 381 | 127 | 330 | 203 | 210 | 270 | 78 | 1 | 25 | 12 | 7/8 | M24 | 155 | 175 |
| 10 | 445 | 146 | 387.5 | 254 | 266 | 324 | 115 | 1-1/8 | 29 | 16 | 1 | M27 | 175 | 195 |
| 12 | 521 | 181 | 451 | 305 | 310 | 381 | 242 | 1-1/4 | 32 | 16 | 1-1/8 | M30 | 185 | 205 |
| 14 | 584 | 222 | 514.5 | 350 | 355 | 413 | 360 | 1-1/4 | 32 | 20 | 1-1/8 | M30 | 195 | 215 |
| 16 | 648 | 232 | 571.5 | 400 | 405 | 470 | 489 | 1-3/8 | 35 | 20 | 1-1/4 | M33 | 205 | 225 |
| 18 | 711 | 264 | 628.5 | 450 | 455 | 533 | 558 | 1-3/8 | 35 | 24 | 1-1/4 | M33 | 210 | 230 |
| 20 | 775 | 292 | 686 | 500 | 505 | 584 | 766 | 1-3/8 | 35 | 24 | 1-1/4 | M33 | 215 | 230 |
| 24 | 914 | 318 | 813 | 600 | 608 | 692 | 1190 | 1-5/8 | 41 | 24 | 1-1/2 | M39 | 250 | 265 |
| 30 | 991 | 368 | 921 | 735 | 740 | 845 | 1996 | 1-1/2 | 38 | 369 | 1-3/8 | M36 | 290 | |
| 36 | 1172 | 483 | 1089 | 873 | 880 | 1010 | 2660 | 1-3/4 | 45 | 32 | 1-5/8 | M42 | 325 | |
| 42 | 1334 | 568 | 1245 | 1035 | 1045 | 1168 | 5515 | 1-7/8 | 48 | 36 | 1-3/4 | M45 | 360 | |
| 48 | 1511 | 629 | 1416 | 1179 | 1190 | 1327 | 6239 | 2 | 51 | 40 | 1-7/8 | M48 | 400 | |
Class 600 Dimension
- Cast Steel Check Valve, Double Flanged Ends
- Dual Plates, Spring Loaded
- Horizontal or Vertical Lines
- Designed to API594.AP16D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL600 |
Class 600 Dimension
| STUD/BOLTING DETAILS | |||||||||||||||
| SIZE (in.) | L | D | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | ||||||||||
| 8 | 165 | 419 | 349 | 200 | 270 | 212 | 134 | 1-1/4 | 32 | 12 | 1-1/8 | M30 | 210 | 215 | |
| 10 | 213 | 508 | 432 | 250 | 324 | 266 | 234 | 1-3/8 | 35 | 16 | 1-1/4 | M33 | 230 | 235 | |
| 12 | 229 | 559 | 489 | 305 | 381 | 312 | 304 | 1-3/8 | 35 | 20 | 1-1/4 | M33 | 240 | 245 | |
| 14 | 273 | 603 | 527 | 337 | 416 | 355 | 490 | 1-1/2 | 39 | 20 | 1-3/8 | M36 | 260 | 265 | |
| 16 | 305 | 686 | 603 | 387 | 470 | 400 | 680 | 1-5/8 | 41 | 20 | 1-1/2 | M39 | 280 | 285 | |
| 18 | 362 | 743 | 654 | 438 | 533 | 450 | 978 | 1-3/4 | 44 | 20 | 1-5/8 | M42 | 295 | 300 | |
| 20 | 368 | 813 | 724 | 489 | 584 | 500 | 1297 | 1-3/4 | 44 | 24 | 1-5/8 | M42 | 310 | 315 | |
| 24 | 438 | 940 | 838 | 591 | 692 | 600 | 1554 | 2 | 52 | 24 | 1-7/8 | M48 | 350 | 360 | |
| *26″and larger are available with ASMEIANSIB16.47end flanges,either Style A or Style B (formerly MSS SP-44 and API605). | |||||||||||||||
Class 900/1500 Dimension
- Cast Steel Check Valve, Double Flanged Ends
- Dual Plates, Spring Loaded
- Horizontal or Vertical Lines
- Designed to API594.AP16D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL900/1500 |
Class 900/1500 Dimension
| CLASS 900 DIMENSION | |||||||||||||||
| STUD/BOLTING DETAILS | |||||||||||||||
| SIZE (in.) | L | D | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | ||||||||||
| 8 | 206 | 470 | 393.7 | 200 | 270 | 212 | 217 | 1-1/2 | 39 | 12 | 1-3/8 | M36 | 245 | 250 | |
| 10 | 241 | 545 | 469.9 | 250 | 324 | 266 | 330 | 1-1/2 | 39 | 16 | 1-3/8 | M36 | 260 | 265 | |
| 12 | 292 | 610 | 533.4 | 305 | 381 | 312 | 509 | 1-1/2 | 39 | 20 | 1-3/8 | M36 | 275 | 280 | |
| 14 | 356 | 640 | 558.8 | 337 | 413 | 355 | 765 | 1-5/8 | 42 | 20 | 1-1/2 | M39 | 295 | 305 | |
| 16 | 384 | 705 | 615.9 | 387 | 470 | 400 | 890 | 1-3/4 | 45 | 20 | 1-5/8 | M42 | 305 | 315 | |
| 18 | 451 | 785 | 685.8 | 438 | 533 | 450 | 1450 | 2 | 51 | 20 | 1-7/8 | M48 | 350 | 365 | |
| 20 | 451 | 855 | 749.3 | 487 | 584 | 496 | 1960 | 2-1/8 | 54 | 20 | 2 | M52 | 370 | 385 | |
| 24 | 495 | 1040 | 901.7 | 591 | 692 | 600 | 2351 | 2-5/8 | 69 | 20 | 2-1/2 | M64 | 470 | 490 | |
| CLASS 1500 DIMENSION | |||||||||||||||
| STUD/BOLTING DETAILS | |||||||||||||||
| SIZE (in.) | L | D | D1 | D2 | D3 | D4 | W.T(kg) | HOLE | DIA. | NO. | DIA. | LENGTH | Unit:mm | ||
| in | mm | in. | mm | RF | RJ | ||||||||||
| 8 | 206 | 483 | 393.7 | 200 | 270 | 212 | 283 | 1-3/4 | 45 | 12 | 1-5/8 | M42 | 315 | 325 | |
| 10 | 248 | 585 | 482.6 | 254 | 324 | 266 | 361 | 2 | 51 | 12 | 1-7/8 | M48 | 365 | 375 | |
| 12 | 305 | 675 | 571.5 | 305 | 381 | 312 | 637 | 2-1/8 | 54 | 16 | 2 | M52 | 400 | 415 | |
| 14 | 356 | 750 | 635 | 337 | 413 | 355 | 1097 | 2-3/8 | 61 | 16 | 2-1/4 | M56 | 435 | 455 | |
| 16 | 381 | 825 | 704.8 | 387 | 470 | 400 | 1152 | 2-5/8 | 67 | 16 | 2-1/2 | M64 | 480 | 505 | |
| *26″and larger are available with ASME/ANSIB16.47end flanges,either Style A or Style B(formerly MSS SP-44 and API605). | |||||||||||||||
Hub Ends Dual Plate Check Valve
Class 600~2500 Dimension
- Cast Steel Check Valve, Hub Ends
- Dual Plates, Spring Loaded
- Horizontal or Vertical Lines
- Designed to API594.AP16D
| Face to Face | API594/API 6D |
| Wall Thickness | ASME B16.34 |
| End Flange | NPS2~24:ASME B16.5* |
| Class | ASME/ANSI CL600~CL2500 |
Class 600~2500 Dimension
| SIZE (in.) | SEAT RING | A | B | D | E | F | W.T(kg) |
| NO. | Unit:inch | ||||||
| 2 | 20 | 3.63 | 4.5 | 2.06 | 5.06 | 4.5 | 5 |
| 14 | 3.63 | 4.5 | 1.16 | 5.06 | 4.5 | 5 | |
| 3 | 27 | 5 | 4.5 | 3.06 | 6.88 | 5.25 | 9 |
| 25 | 5 | 4.5 | 2.67 | 6.88 | 5.25 | 9 | |
| 20 | 5 | 4.5 | 2.06 | 6.88 | 5.25 | 9 | |
| 4 | 40 | 6 | 5 | 2.06 | 8.13 | 6 | 11 |
| 34 | 6 | 5 | 3.69 | 8.13 | 6 | 11 | |
| 31 | 6 | 5 | 3.25 | 8.13 | 6 | 11 | |
| 25 | 6 | 5 | 2.67 | 8.13 | 6 | 15 | |
| 6 | 62 | 9.25 | 6.25 | 6.07 | 12 | 8.75 | 35 |
| 52 | 9.25 | 6.25 | 5.31 | 12 | 8.75 | 35 | |
| 46 | 9.25 | 6.25 | 4.75 | 12 | 8.75 | 35 | |
| 40 | 9.25 | 6.25 | 4.06 | 12 | 8.75 | 40 | |
| 8 | 82 | 11.5 | 8.13 | 8.25 | 14.5 | 9.88 | 72 |
| 76 | 11.5 | 8.13 | 7.75 | 14.5 | 9.88 | 72 | |
| 72 | 11.5 | 8.13 | 7.25 | 14.5 | 9.88 | 72 | |
| 62 | 11.5 | 8.13 | 6.07 | 14.5 | 9.88 | 83 | |
| 52 | 11.5 | 8.13 | 5.31 | 14.5 | 9.88 | 83 | |
| 10 | H97 | 13.63 | 9.75 | 9.88 | 17.63 | 12.75 | 110 |
| H94 | 13.63 | 9.75 | 9.5 | 17.63 | 12.75 | 110 | |
| H84 | 13.63 | 9.75 | 8.5 | 17.63 | 12.75 | 140 | |
| H82X | 13.63 | 9.75 | 8.25 | 18.25 | 13.5 | 140 | |
| H72 | 13.63 | 9.75 | 7.25 | 18.25 | 12.75 | 140 | |
| H62 | 13.63 | 9.75 | 6.07 | 18.25 | 12.75 | 157 | |
| H62X | 13.63 | 9.75 | 6.07 | 18.25 | 13.5 | 157 | |
| 12 | M120 | 16 | 12.5 | 12 | 20.25 | 14.5 | 177 |
| M112 | 16 | 12.5 | 11.25 | 20.25 | 14.5 | 177 | |
| M102 | 16 | 12.5 | 10.25 | 20.25 | 14.5 | 228 | |
| M82 | 16 | 12.5 | 8.25 | 20.25 | 14.5 | 268 | |
| M82X | 16 | 12.5 | 8.25 | 20.5 | 15.75 | 268 | |
| *26″and largerare availablew with ASME/ANSI B16.47 end fla es,eitherStyle A or Style B(formeerly MSS SP-44 and API605). | |||||||
What is Dual Plate Check Valve?
The dual plate check valve was developed to solve issues found in traditional swing and lift check valves. It uses two spring-loaded plates attached to a central hinge screw. As the flow decreases, the torsional spring action closes the plates before the flow can reverse.
This design prevents water hammer and ensures a non-slam operation. These features make the dual plate check valve a highly effective and efficient option, often called a “silent check valve.”
Dual-Plate Check Valve Classification
By Body Structure
Retainer-less construction ensures that the valve body is not fully drilled to fit the hinge-pin and stop-pin in a dual-plate check valve. Instead, a recess is machined. This design enhances the integrity of the valve, especially at high pressure, reducing the risk of body leaks.
By Sealing Method
Soft Seal
A soft seal means that one of the sealing parts is made from low-hardness materials. Typically, the soft seal seat is made from non-metallic materials that have a certain strength, hardness, and can tolerate high temperatures to ensure zero leakage. However, compared to metal seal valves, soft seal valves have a shorter service life and less temperature resistance.
Although some vendors claim that their hard seal valves can achieve zero leakage, the sealing performance is generally not as strong as that of soft seal valves. However, soft seal valves may not meet the technical requirements for corrosion resistance in certain corrosive environments.
Metal Seal
Both ends of the sealing pair in a hard seal valve are made of metal or other high-hardness materials. This makes the valve a hard seal or metal-to-metal seal valve. While hard seal valves may have lower sealing performance compared to soft seals, they offer higher temperature tolerance, better corrosion resistance, and stronger mechanical properties.
The materials used can include steel paired with steel, copper, graphite, or alloy steel. The valve components might be made from cast iron, cast bronze, alloy steel, bead welding alloy, or sprayed alloy.
By End Connection Type
Lug
Lugged type flange connections are similar to wafer types but with some differences. The lug holes are drilled so that each bolt hole on the flanges has a corresponding lug hole. Each threaded hole holds two bolts, one from each flange on opposite sides.
This setup allows for dead-end operation, where only one side of the valve is connected to a flange, and the other side is exposed to the environment, as long as the seat or retainer is securely screwed in place.
Wafer
In a wafer attachment, the valve is placed between the pipe flanges, and the bolts from the flanges hold it in place. Some wafer valves have centering holes to make sure they are positioned correctly between the flanges. This type of valve is the lightest option for installing between pipe flanges, making it more affordable than other types of valves.
Flange
The valve has a flanged end connection with bolt holes to secure the flanges to the shaft. Flanged attachments make it easier to remove and repair the valve. They are commonly used in larger valve sizes. Gaskets are necessary where the flanges connect to ensure a proper seal.
Butt Weld
The valve and pipe ends have the same diameter. The outer edges of both are machined to create a “valley” that is filled with welding metal. The two parts are welded together around the rims, as shown in the image. Butt welding connections are typically used for smaller diameters, usually 2 inches and below.
How Does Dual Plate Check Valve Work?
The valve plate opens when fluid pressure flows in one direction. If the fluid flows from the opposite direction, the plate impacts the valve seat, cutting off the flow. The reduced flow allows the torsion spring to close the plate, preventing any reversal in fluid flow.
The valve has a cylindrical body, which offers a more even stress distribution compared to other valve designs. This cylindrical construction is built to handle heavy loads and the weight or thickness of the valve. As a result, under demanding loading conditions, this valve provides a clear advantage in terms of safety and cost-effectiveness.
Features of Dual Plate Check Valve
Low Pressure Drop
The pressure drop in a dual plate check valve is notably lower than in other check valves, enabling more efficient flow and reduced energy loss.
Spring-Assisted Closing Mechanism
Each plate, half the size of a swing check disc, provides a straight flow path with minimal resistance. Spring-assisted closing begins when flow velocity dips below the set minimum.
Cushioned Closing to Reduce Slamming
The momentum generated as plates close is lower than in swing check valves. Spring-assisted closure cushions plates and seat, preventing slamming at flow reversal.
Non-Slam Design
Dual plates in the check valve are centrally mounted for horizontal setups, eliminating gravity’s effect on the plates and preventing slamming during closure.
Benefits of Dual Plate Check Valve
Minimal Wear and Tear
Low wear and tear of the seat due to its non-slamming, spring-loaded design, ensuring extended lifespan.
Reduced Water Hammer
Water hammers are almost negligible in dual-plate check valves because valve closure does not rely on backpressure and backflow.
Applications of Dual Plate Check Valve
Versatility Across Material and System Configurations
A dual plate check valve is the most suitable type of check valve that can be used for almost any configuration of material and system parameters.
Water System Applications
Typical applications include water systems like boilers, potable water, fire safety systems, cooling & heating water systems, etc.
Petrochemical Applications
Used in offshore/onshore applications, LPG, LNG, lube oil, cryogenics, etc., within the petrochemical industry.
Hydrocarbon Applications
Suitable for almost all hydrocarbon-related applications.
Air and Gas Applications
Applicable in air and gas systems involving chlorine, hydrogen, nitrogen, carbon dioxide, oxygen, etc.
Metallurgical and Chemical Applications
Widely used in industries like sugar, pharmaceuticals, paper, cement, steel, aluminum, copper, zinc, and more.
Installation Instructions
Cleaning the Valve
The end connections of the Dual Plate Check Valves are secured by rust-proof oil. Clean the same before installation. Valve plates should be tested to verify that they are free of rust/oil.
Checking the Direction of Flow
The direction of flow in the line should match the direction of flow marked by the ‘arrow’ on the valve body and as indicated on the nameplate.
Horizontal Piping Installation
Insert the valve into the conduit such that the Pin Retainers (Plugs) are positioned up and down.
Installation Distance between Check Valve and Butterfly Valve
Ensure sufficient space between the Dual Plate Check Valve and the Butterfly Valve so that the plates of the Dual Plate Check Valve are in an open position and the Butterfly Valve disc does not touch the Dual Plate Check Valve. Also, ensure adequate distance to prevent any peripheral or irregular flow conditions.
Valve Orientation to Pump’s Discharge
When fitting the Dual Plate Check Valve to the pump, ensure that the pump flow follows the two plates of the valve for better output.
Optimal Flow Velocity
Valves are configured to operate optimally open at a line flow rate of 2 to 2.7 m/sec of water for horizontal installations. The flow velocity for vertical installation can be marginally higher. For fluids with less specific gravity, specify at the time of enquiry.
Cyclic Flow Applications
Refer to the manufacturing company for cyclic flow applications such as the outlet of reciprocating machines.
Uniform Flow Velocity Installation
Dual Plate Check Valves should be mounted where the flow velocity around the cross-section is uniform.
Differences Between Dual Plate Check Valve And Swing Check Valve
Weight and Handling
Dual plate check valves are lightweight and easy to handle, whereas swing check valves are comparatively bulky, requiring a heavier handling and support system.
Structural Design
The structure of the dual plate check valve is compact and well-designed, while the swing check valve has a complex body shape, making it difficult to assess stress points for critical applications.
Installation Orientation
Dual plate check valves can be installed in both horizontal and vertical directions, while swing check valves are primarily suitable for horizontal applications.
Spring-Assisted Closure
Dual plate check valves, with their spring-assisted closure, can be installed for upside-down flow, a feature not possible with swing check valves.
Pressure Drops and Energy Losses
Pressure drops and energy losses are lower in dual plate check valves compared to swing check valves, regardless of pressure ratings.
Non-Slamming Design
Dual plate check valves have a non-slamming design, whereas swing check valves require an external device to counteract the slamming effect.
Water Hammering
Dual plate check valves experience negligible water hammering, unlike swing check valves.
Maintenance Requirements
Swing check valves require regular maintenance of the seat and hinges due to impact loads and wear from rubbing, while dual plate check valves offer a long life and trouble-free operation.
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Additional General Insights Here
Specs of Dual Plate Check Valve
Body and Disc Material
The Dual Plate Check Valve features a body made from high-grade stainless steel and discs crafted from high-strength alloy steel. This combination provides excellent strength and resistance to rust and corrosion. It performs well in various environments, including high temperatures and pressures. The durable materials result in a long lifespan, minimizing the need for replacements and providing reliable performance.
End Connections
Dual Plate Check Valves come with flanged, wafer, or lug end connections. Flanged connections allow for easy installation and maintenance. Wafer types fit between flanges, saving space, while lug types are ideal for systems needing frequent disassembly. The choice of end connection depends on the specific application needs.
Design Features
The valve boasts a compact and lightweight design, facilitating easy installation. It includes dual plates that open and close swiftly to prevent backflow. Think about it – this design also minimizes water hammer, a common issue in piping systems. NTVAL builds each valve with precision for dependable performance.
Features of Dual Plate Check Valve
Anti-Slam Functionality
The anti-slam feature of Dual Plate Check Valves prevents the valve from slamming shut during flow stoppages. A spring mechanism controls the closing speed of the plates. This protects the piping system from shock waves and vibrations. No wonder this feature is essential in systems with sudden flow changes.
Dual Plate Mechanism
The NTVAL Dual Plate Check Valve uses a dual plate mechanism that provides better sealing compared to single plate designs. This mechanism evenly distributes pressure, reducing wear and tear. It also minimizes leakage risk, offering a dependable seal. This feature contributes to the valve's durability and performance.
Minimal Maintenance
Dual Plate Check Valves require minimal maintenance due to their simple design. The structure allows easy access to internal components, making inspections straightforward. This reduces downtime and maintenance costs. It's an efficient choice for long-term use in various industries.
Benefits of Dual Plate Check Valve
Reduced Water Hammer
One of the key benefits of Dual Plate Check Valves is their ability to reduce water hammer. The design of the valve allows for smoother operation, with the dual plates closing quickly yet softly when the flow stops. This helps to minimize the shock and noise associated with water hammer, protecting the piping system from potential damage. The reduction in water hammer contributes to the longevity of the system.
Enhanced System Efficiency
The Dual Plate Check Valve helps improve system efficiency. Its low-pressure drop design allows fluids to flow smoothly with minimal resistance. This reduces energy consumption, making the system more cost-effective to operate. For example, the valve's efficient design supports overall system performance.
Reliable Backflow Prevention
This valve provides reliable backflow prevention. For example, the quick response of the dual plates stops backflow immediately, protecting the system from damage. This benefit is crucial for maintaining the integrity of various industrial processes. Consistent backflow prevention helps avoid costly repairs and downtime.
Applications of Dual Plate Check Valve
Chemical Processing Plants
In chemical processing plants, the Dual Plate Check Valve plays a crucial role. It handles aggressive chemicals without corroding or failing. The valve’s quick response prevents backflow, protecting sensitive equipment and maintaining process integrity. Its durable design supports safe and efficient chemical processing operations.
Power Generation
Power generation plants use Dual Plate Check Valves to manage the flow of steam, water, and other fluids. The valve’s low pressure drop design enhances system efficiency, which is crucial for power production. It also prevents backflow, protecting turbines and other equipment. This makes the valve an essential component in power generation systems.
Oil and Gas Industry
The oil and gas industry relies on Dual Plate Check Valves for their pipelines. These valves can withstand high pressure and harsh conditions common in this industry. They prevent backflow and maintain the smooth operation of pipelines. Yes, you read that right, NTVAL’s high-quality valves are trusted for their durability and performance in oil and gas applications.
Mining and Mineral Processing
In mining and mineral processing, Dual Plate Check Valves help regulate the flow of abrasive slurries and chemical solutions. They prevent backflow that could clog or damage equipment, enhancing the durability of pipelines. Their ability to withstand harsh environments makes them a solid choice for mining operations where reliability is crucial.
3 Considerations When Buying Dual Plate Check Valve
01
Stainless Steel
When buying a Dual Plate Check Valve, consider the materials used. NTVAL’s high-grade stainless steel and alloy steel are excellent choices for durability and corrosion resistance. Turns out, the right materials make the valve perform well in various environments and last longe
02
Environmental Impact
Considering the environmental impact of a valve’s materials and operation is important. Valves made from eco-friendly materials or designed to lower energy consumption contribute to sustainability. This is crucial for industries aiming to reduce their environmental footprint. Selecting a valve with lower environmental impact supports sustainability goals.
03
Certification API607
The valve meets the API607 certification for fire safety. This certification guarantees that the valve can withstand fire conditions, providing added safety to the system. Valves with API607 certification are tested for fire resistance and reliability. Choosing a valve with this certification demonstrates compliance with safety standards and enhances system protection.
FAQS About Dual Plate Check Valve
Yes, there are versions of the Dual Plate Check Valve specifically designed for cryogenic conditions.
Yes, NTVAL’s Dual Plate Check Valves are designed for versatile installation, allowing them to be used in both horizontal and vertical orientations.
Yes, a reliable supply of spare parts is available, making it easy to maintain the valves throughout their service life.
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