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API Check Valve

API Check Valve

API Check valves are used to allow fluid to flow in one direction while preventing backflow, and safeguarding pumps, compressors, and other equipment from potential damage.

 

Additional information

Description

What is API Check Valve

An API check valve is a type of check valve that complies with the standards set by the American Petroleum Institute (API), a trade association responsible for establishing guidelines and standards for the oil and gas industry. Check valves are used to allow fluid to flow in one direction while preventing backflow, and safeguarding pumps, compressors, and other equipment from potential damage.

api check valve

API check valves are designed specifically for applications in the oil and gas sector and are subjected to rigorous testing and quality assurance processes to ensure they can withstand the harsh environments and demanding operating conditions typically found in this industry.

There are several types of check valves that can fall under the API classification, such as swing check valves, lift check valves, piston check valves, and ball check valves. Each type has a unique mechanism for controlling fluid flow and preventing backflow.

The API standards for check valves cover various aspects, including design, materials, manufacturing, testing, and documentation. These standards help ensure the valves’ compatibility, interchangeability, and reliable performance in their intended applications. API check valves are often specified by their API standards, such as API 6D or API 594, which dictate the specific requirements for different types of check valves.

Technical specifications

 Type Design and manufacturing Face-to-face dimension  Flange size Pressure- temperature Test and inspection
Swing check valve ANSI B16.34 ANSI B16.10 ANSIB16.15 ANSI B16.34 API598
 Lift check valve BS 1 868

 

Pressure rating PN(MPa) Strength test Water seal test Air seal test
MPa Lbf/in4 MPa Lbf/ins MPa Lbf/in4
150 3 430 2.2 315 0.4~0.7 60-100
300 7.7 1110 5.7 815
600 15.3 2220 11.3 1630
900 23 3330 17 2445
1500 38.4 5560 28.2 4080
2500 64 9255 47 6790

Parts Material of the API Check Valve

Parts name Material science Working temperature
Valve nut  Carbon steel/stainless steel -196℃~565℃
Gasket Carbon steel/stainless steel
Rocker pin Carbon steel/stainless steel
Seat CS+SS/SS/SS+STL
Discs CS+SS/SS/SS+STL

 

Parts name WCB LCB WC6 WC9 Applicable medium
Inner bolt A193GrB7/A194Gr2H A320GrL7/A194Gr4 A193 GrB16/A194Gr4/7 A193GrB16/A194Gr4/7  Water, oil, gas Nitric acid, acetic acid
Middle flange bolt nut A193 GrB7/A194Gr2H A320 GrL7/A194Gr4 A193 GrB16/A194Gr4/7 A193GrB16/A194Gr4/7
Gasket Spiral wound/soft iron Spiral wound/soft iron Spiral wound/SS304 Spiral wound/SS304
Bracket A216GrWCB A352 GrLCB A217GrWC6 A217GrWC9
Rocker arm A216GrWCB A352 GrLCB A217GrWC6 A217GrWC9
Valve cover A216GrWCB A352 GrLCB A217GrWC6 A217GrWC9
Body A216GrWCB A352 GrLCB A217GrWC6 A217GrWC9

 

 

api check valve

 

Size Inch DN LRF LBW D D1 b Z-φd A B H
150Lb
2 50 203 203 150 120.5 14 4-19 60 52 160
2l/2 65 216 216 180 139.5 16 4-19 75 63 180
3 80 241 241 190 152.5 17.5 4-19 91 78 190
4 100 292 292 230 190.5 22 8-19 117 102 205
5 125 330 330 255 216 22 8-22 144 128 230
6 150 356 356 280 241.5 24 8-22 172 154 258
8 200 495 495 345 298.5 27 8-22 223 203 295
10 250 622 622 405 362 28.6 12-25 278 255 355
12 300 699 699 485 432 30 12-25 329 305 395
14 350 787 787 535 476 33.4 12-29 362 337 445
16 400 864 864 595 540 35 16-29 413 387 490
18 450 978 978 635 578 38 16-32 464 438 520
20 500 978 978 700 635 41 20-32 516 489 545
24 600 1295 1295 815 749.5 46 20-35 619 591 880
300Lb
2 50 267 267 165 127 21 8-19 60 52 180
2l/2 65 292 292 190 149.4 24 8-22 75 63 190
3 80 318 318 210 168.1 27 8-22 91 78 215
4 100 356 356 255 200.2 30 8-22 117 102 242
5 125 400 400 280 235 33 8-22 144 128 268
6 150 444 444 320 269.7 35 12-22 172 154 305
8 200 533 533 380 330.2 40 12-25 223 203 368
10 250 622 622 445 387.4 46 16-29 278 255 395
12 300 711 711 520 450.9 49 16-32 329 305 445
14 350 38 838 585 514.5 52 20-32 362 337 470
16 400 846 846 650 571.5 56 20-35 413 387 530
18 450 978 978 710 628.5 59 24-35 464 438 585
20 500 1016 1016 775 686 62 24-35 516 489 610
24 600 1346 1346 915 813 68 24-41 619 591 750

 

api check valve

 

Size Inch DN LBW LRJ D D1 b Z-φd K P E F A B H
600Lb
2 50 292 295 165 127 26 8-1 9 108 82.55 7.92 11.91 60 49 205
21/2 65 330 333 190 149.5 29 8-22 127 101.6 7.92 11.91 75 59 230
3 80 356 359 210 168 32 8-22 146 123.83 7.92 11.91 91 74 235
4 100 432 435 275 216 39 8-25 175 149.23 7.92 11.91 117 97 286
5 125 508 511 330 266.5 45 8-29 210 180.98 7.92 11.91 144 122 295
6 150 559 562 355 292 48 12-29 241 211.12 7.92 11.91 172 146 330
8 200 660 663 420 349 56 12-32 302 269.88 7.92 11.91 223 194 381
10 250 787 791 510 432 64 16-35 356 323.85 7.92 11.91 278 243 458
12 300 838 841 560 489 67 20-35 413 381 7.92 11.91 329 298 581
14 350 889 892 605 527 70 20-38 457 419.1 7.92 11.91 362 330 635
16 400 991 994 685 603 76 20-41 508 469.9 7.92 11.91 413 373 585
900Lb
2 50 368 371 215 165.1 38 8-25 124 95.25 7.92 11.91 60 49 215
21/2 65 419 422 245 190.5 41 8-25 137 107.95 7.92 11.91 75 59 255
3 80 381 384 240 190.5 38 8-29 156 123.83 7.92 11.91 91 74 295
4 100 457 460 290 235 45 8-32 181 149.23 7.92 11.91 117 97 318
5 125 559 562 350 279.4 51 8-35 216 180.98 7.92 11.91 144 122 345
6 150 610 613 380 317.5 56 12-32 241 211.12 7.92 11.91 172 146 368
8 200 737 740 470 393.7 64 12-38 308 269.88 7.92 11.91 223 194 435
10 250 838 841 545 469.9 70 16-38 362 323.85 7.92 11.91 278 243 545
12 300 965 968 610 533.5 79 20-39 419 381 7.92 11.91 329 298 660
1500Lb
2 50 368 371 215 165.1 38 8-25 124 95.25 7.92 11.91 60 42 215
21/2 65 419 422 245 190.5 41 8-29 137 107.95 7.92 11.91 75 54 265
3 80 470 473 265 203.2 48 8-32 168 136.53 7.92 11.91 91 67 290
4 100 546 549 310 241.3 54 8-35 194 161.93 7.92 11.91 117 87 325
5 125 673 676 375 292.1 73 8-42 229 193.68 7.92 11.91 144 110 402
6 150 705 711 395 317.5 83 12-38 248 211.14 9.53 13.49 172 132 435
8 200 832 841 485 393.7 92 12-45 318 269.88 11.13 16.66 223 178 520

 

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