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Current Location:zhenghao valve >> Valve >> Check Valve >> API/BS1868 Swing Check Valve

API/BS1868 Swing Check Valve

API/BS1868 Swing Check Valve
Short Description

API swing check valve is suitable for pipelines of various working conditions such as petroleum, chemical, hydraulic, thermal power stations, etc., cutting or connecting the medium. Applicable medium: water, oil, steam, etc.4.The valve body material ..

Tags:Check Valve,Valve

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Quick Detail

API swing check valve refers to the valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, also known as check valve, check valve, counter flow valve, and back pressure valve. The function of this type of valve is to only allow the medium to flow in one direction and prevent the direction from flowing. Usually, the valve is automatically operated, and the valve flap is opened by the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat to cut off the flow.


API swing check valve is suitable for pipelines of various working conditions such as petroleum, chemical, hydraulic, thermal power stations, etc., cutting or connecting the medium. Applicable medium: water, oil, steam, etc.

Structural features

1.Product design and manufacture according to API/BS1868 design standards, reasonable structure, reliable sealing, beautiful appearance.

2.The sealing surface of the valve disc and the valve seat is made of stellite cobalt-based hard alloy, which is wear-resistant, high-temperature resistant, good in scratch resistance and long in service life.

3.Various pipe flange standards and flange sealing surface types can be used to meet various engineering needs and user requirements.


4.The valve body material is complete, and the packing and gasket are reasonably matched according to actual working conditions or user requirements, and can be applied to various pressure, temperature and medium working conditions.

5.The disc rotates around the pin outside the seat to reduce the violent impact of closing.

6.The pin and the valve flap are connected by a built-in pin structure, which reduces the external leakage point and is more reliable to use.

Reference Standard

Design and Manufacturing: API 6D

Structure length: ANSI B 16.10

Flange standard: ANSI B 16.5a

Butt end size: ANSI B 16.25

Stress test: API 6D or API 598

Performance specification

CLASS(Lb) 150 300 600 900
Shell Test MPa 3.1 7.8 15.3 23.1
Lbf/in2 450 1125 2225 3350
Water seal test MPa 2.2 5.6 11.2 16.8
Lbf/in2 315 815 1630 2440
Air seal test MPa 0.5～0.7
Lbf/in2 60～100

Main parts materials and performance

Body, cover, disc, rocker, guide sleeve Stem Gasket Seat Operating temperature Applicable medium
WCB 2Cr13

Flexible graphite

1Cr13/Flexible graphite

Stainless steel / acid asbestos PTFE gasket

13Cr STL body material

PTFE nylon

 ≤425 Water, steam, oil
WC1 ≤450
WC6 ≤540
WC9 ≤570
C5 C12 ≤550
CF8 304 ≤200 (Non-corrosive medium ≤600) Nitric acid, acetic acid, strong oxidizing medium, urea
CF3 316
CF8M 304L
CF3M 316L

Main shape and connection size

Class NPS DN L D D1 D2 b Z-Φd H WT (㎏)
in mm
150Lb 2″ 50 203 157 120.7 92 19.50 4-Φ19 161 17
21/2″ 65 216 178 139.7 105 22.5 4-Φ19 180 23
3″ 80 241 190.5 152.4 127 24 4-Φ19 190 33
4″ 100 292 229 190.50 157.2 24 8-Φ19 220 44
6″ 150 356 279 241.5 216 25.5 8-Φ22.5 257 78
8″ 200 495 343 298.5 270 29 8-Φ22.5 292 137
10″ 250 622 406 362 324 30.5 12-Φ25 350 207
12″ 300 698 483 432 381 32 12-Φ25 398 279
14″ 350 787 533 476.8 413 35 12-Φ29 445 387
16″ 400 864 597 539.8 470 37 16-Φ29 490 446
18″ 450 978 635 577.8 533 40 16-Φ32 520 621
20″ 500 978 698 635 584 43 20-Φ32 546 770
24″ 600 1295 813 749.3 692 48 20-Φ35 880 970
300Lb 2″ 50 267 165 127 92 22.5 8-Φ19 179.5 20
21/2″ 65 292 190 150 105 25 8-Φ22 190 24
3″ 80 318 210 168 127 29.0 8-Φ22.5 212.4 40
4″ 100 356 254 200 157 32.0 8-Φ22.5 246 51
6″ 150 445 317.5 269.7 216 37.0 12-Φ22.5 292 90
8″ 200 533 381 330 270 41.5 12-Φ25.5 328 175
10″ 250 622 444.5 387 324 48.0 16-Φ28.5 378.6 210
12″ 300 711 521 451 381 51.0 16-Φ32 420 286
14″ 350 838 584 514 54 57 20-Φ32 470 400
16″ 400 864 648 572 57 57 20-Φ35 530 550
18″ 450 978 711 629 60 60 24-Φ35 584 700
20″ 500 1016 775 686 64 64 24-Φ35 610 860
24″ 600 1346 914 813 70 70 24-Φ41 860 1931
600Lb 2″ 50 292 165 127 92 25 8-Φ19 203 34
21/2″ 65 330 190 150 105 29 8-Φ22 229 45
3″ 80 356 210 168 127 32 8-Φ22 235 63
4″ 100 432 273 216 157 38 8-Φ25 286 114
6″ 150 559 356 292 216 48 8-Φ29 330 207
8″ 200 660 419 349 270 56 12-Φ29 381 387
10″ 250 787 508 432 324 64 12-Φ32 457 580
12″ 300 838 559 489 381 67 16-Φ35 584 778
14″ 350 889 603 527 413 70 20-Φ38 635 9896
16″ 400 991 686 603 470 76 20-Φ41 684 1380
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