Trusted Swing Check Valve Manufacturer









Reliable Swing Check Valve
Specifications
- Bolted Cover
- Size Range: NPS 2 to NPS 36
- Pressure Range: 150LB to 2500LB
- Design STD.: BS1868/ API6D
- Swing Check Valve Manufacturer

Quality Control

PMI Test

Sealing Test

Low Emission Test

Impact Test

Dimension Inspection

Painting Thickness Test

PT

Material Inspection
Our Valve Applications in Key Industries

Chemical Processing

Petrol Chemical

O.P.G & Nuclear

Pulp

Mining

Water & Sewage

Steam System

Boiling System
Typical Cast Steel Bolted Cover Swing Check Valve Expanded View



Standard Parts and Materials
NO. | PART NAME | CARBON STEEL | ALLOY STEEL | STAINLESS STEEL | ||||
TYPE WCB | TYPE LCB | TYPE WC6 | TYPE WC9 | TYPE C5 | TYPE C12 | TYPE CF8M | ||
1 | BODY | A216-WCB | A352-LCIB | A217-WC6 | A217-WC9 | A217-C5 | A217-C12 | A351-CF8M |
2 | COVER | A216-WCB | A352-LCIB | A217-WC6 | A217-WC9 | A217-C5 | A217-C12 | A351-CF8M |
3 | DISC | A217CA15or | A351 CF8Mor | A217CA15or | A217CA15or | A217CA15or | A217CA15or | A351-CF8M |
WCB+410 | LCB+316 | WC9+410 | WC9+410 | C5+410 | C12+410 | |||
4 | SEATRING | A105 | A182-F316 | A182F11+STL | F22+STL | F5a+STL | F9+STL | A479-316 |
5 | HINGEARM | A216-WCB | A352-LCB | A217-WC6 | A217-WC9 | A217-C5 | A217-C12 | A351-CF8M |
6 | DISCNUT | A194 Gr8 | A194 Gr8 | A194 Gr8 | A194 Gr8 | A194 Gr8 | A194 Gr8 | A194-8 |
7 | WASHER | A240-304 | A240-316 | A240-304 | A240-304 | A240-304 | A240-304 | A240-316 |
8 | SPLIT PIN | A580-304 | A580-316 | A580-304 | A580-304 | A580-304 | A580-304 | A580-316 |
9 | COVER BOLT | A193-B7 | A320-L7 | A193-B16 | A193-B16 | A193-B16 | A193-B16 | A193-B8 |
10 | COVER NUT | A194-SH | A194-4 | A194-4 | A194-4 | A194-4 | A194-4 | A194-8 |
11 | HINGE PIN | A479-410 | A479-410 | A479-410 | A479-410 | A479-410 | A479-410 | A479-316 |
12 | FLANGEDPLUG | A479-410 | A479-304 | A479-304 | A479-304 | A479-304 | A479-304 | A479-316 |
13 | GASKET | Graphite+304SS | Graphite+304SS | Graphite+304SS | Graphite+304SS | Graphite+304SS | Graphite+304SS | Graphite+304SS |
14 | PLUGGASKET | Soft Steel | Soft Steel | SoftSteel | SoftSteel | SoftSteel | Soft Steel | Stainless Steel |
15 | NAMEPLATE | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
Cast Steel Swing Check Valve
CLASS 150 DIMENSION
- Cast steel swing checkvalve
- Horizontal or verticallines, bolted cover
- Available inwelded or threadedseat rings
- Designed according to APl-600
Face to Face | ASME/ANSI B16.10 |
End Flange | ASME/ANSI B16.5* |
Butt Weld | ASME/ANSI B16.25 |
Class | ASME/ANSI CL150 |

CLASS 150 DIMENSION | ||||||||
SIZE | 1-1/2″ | 2″ | 2-1/2″ | 3″ | 4″ | 6″ | 8″ | 10″ |
Unit:inch | ||||||||
L1:RF | 6.5 | 8 | 8.5 | 9.5 | 11.5 | 14 | 19.5 | 24.5 |
L2:RTJ | 7 | 8.5 | 9 | 10 | 12 | 14.5 | 20 | 25 |
L3:BW | 6.5 | 8 | 8.5 | 9.5 | 11.5 | 14 | 19.5 | 24.5 |
H | 5.11 | 6.3 | 6.7 | 7.49 | 8.87 | 10.18 | 12.6 | 13.72 |
WT R F | 33 | 38 | 48 | 68 | 110 | 203 | 299 | 430 |
(bs) BW | 28 | 31 | 38 | 56 | 95 | 183 | 266 | 284 |
SIZE | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ | 30″ | 36″ |
Unit:inch | ||||||||
L1:RF | 27.5 | 31 | 34 | 38.5 | 38.5 | 51 | 60 | 77 |
L2:RTJ | 28 | 31.5 | 34.5 | 39 | 39 | 51.5 | 60.5 | 77.5 |
L3:BW | 27.5 | 31 | 34 | 38.5 | 38.5 | 51 | 60 | 77 |
H | 14.96 | 15.79 | 18.11 | 19.88 | 22.2 | 26.89 | 36 | 41.5 |
WT RF | 628 | 926 | 1,102 | 1,411 | 1,720 | 3,285 | 5,077 | 8,160 |
(lbs) BW | 572 | 804 | 980 | 1,160 | 1,495 | 2,945 | 4,315 | 7,010 |
CLASS 300 DIMENSION
- Cast steel swing checkvalve
- Horizontal or verticallines, bolted cover
- Available inwelded or threadedseat rings
- Designed according to APl-600
Face to Face | ASME/ANSI B16.10 |
End Flange | ASME/ANSI B16.5* |
Butt Weld | ASME/ANSI B16.25 |
Rating | ASME/ANSI Class 300 |

CLASS 300 DIMENSION | ||||||||
SIZE | 2″ | 2-1/2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ |
L1:RF | 10.5 | 11.5 | 12.5 | 14 | 17.5 | 21 | 24.5 | 28 |
L2:RTJ | 11.13 | 12.13 | 13.33 | 14.63 | 18.13 | 21.63 | 25.13 | 28.63 |
L3:BW | 10.5 | 11.5 | 12.5 | 14 | 17.5 | 21 | 24.5 | 28 |
H | 6.3 | 7.44 | 7.83 | 8.94 | 10.94 | 12.68 | 15.08 | 17.13 |
WT R F | 56 | 72 | 108 | 160 | 299 | 406 | 657 | 916 |
(bs) BW | 43 | 55 | 88 | 102 | 240 | 317 | 525 | 750 |
SIZE | 14″ | 16″ | 18″ | 20″ | 24″ | 30″ | 36″ | Unit:inch |
L1:RF | 33 | 34 | 38.5 | 40 | 53 | 62.75 | 82 | |
L2:RTJ | 33.63 | 34.63 | 39.13 | 40.75 | 53.88 | 63.75 | 83 | |
L3:BW | 33 | 34 | 38.5 | 40 | 53 | 62.75 | 82 | |
H | 20.08 | 20.51 | 22.52 | 24.76 | 28.03 | 37 | 42.99 | |
WT R F | 1,503 | 1,649 | 2,097 | 2,494 | 4.5 | 5,850 | 10.5 | |
(lbs) BW | 1,241 | 1,305 | 1,803 | 2,150 | 3.,870 | 5,020 | 9,450 |
CLASS 600-1500 DIMENSION
- Cast steel swing checkvalve
- Horizontal or verticallines, bolted cover
- Available inwelded or threadedseat rings
- Designed according toAP1-600
Face to Face | ASME/ANSI B16.10 |
End Flange | ASME/ANSI B16.5 |
Butt Weld | ASME/ANSI B16.25 |
Rating | ASME/ANSI Class 600~1500 |

CLASS 600 DIMENSION | ||||||||||||
SIZE | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
L1:RF | 11.5 | 14 | 17 | 22 | 26 | 31 | 33 | 35 | 39 | 43 | 47 | 55 |
L2:RTJ | 11.63 | 14.13 | 17.13 | 22.13 | 26.13 | 31.13 | 33.13 | 35.13 | 39.13 | 43.13 | 47.25 | 55.38 |
L3:BW | 11.5 | 14 | 17 | 22 | 26 | 31 | 33 | 35 | 39 | 43 | 47 | 55 |
H | 7.38 | 8.25 | 10.06 | 12.94 | 14.31 | 18.25 | 19.13 | 22.5 | 26 | 28 | 31 | 34 |
WT RF | 71 | 130 | 247 | 474 | 849 | 1,351 | 1,918 | 2,068 | 2,976 | 4,451 | 5,269 | 6,634 |
(bs) BW | Ge | 110 | 223 | 364 | 686 | 1,081 | 1,605 | 1,693 | 2,469 | 3,802 | 4,443 | 5,137 |
CLASS 900 DIMENSION | ||||||||||||
SIZE | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
L1:RF | 14.5 | 15 | 18 | 24 | 29 | 33 | 38 | 40.5 | 44.5 | 48 | 52 | 61 |
L2:RTJ | 14.63 | 15.13 | 18.13 | 24.13 | 29.13 | 33.13 | 38.13 | 40.87 | 44.87 | 48.5 | 52.5 | 61.75 |
L3:BW | 14.5 | 15 | 18 | 24 | 29 | 33 | 38 | 40.5 | 44.5 | 48 | 52 | 61 |
H | 10.51 | 11.42 | 12.05 | 13.31 | 18.11 | 19.69 | 22.75 | 25.47 | 27.95 | 30.9 | 33.46 | 36.61 |
WT RF | 161 | 181 | 307 | 582 | 1,210 | 1,800 | 3,200 | 3,850 | 5,324 | 7,150 | 8.8 | 12.76 |
(bs) BW | 119 | 136 | 235 | 247 | 1,010 | 1,545 | 2,720 | 3,190 | 4,510 | 5,940 | 7,260 | 9.9 |
CLASS 1500 DIMENSION | ||||||||||||
SIZE | 2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
L1:RF | 14.5 | 18.5 | 21.5 | 27.75 | 32.75 | 39 | 44.5 | 49.5 | 54.5 | 60.5 | 65.5 | 76.5 |
L2:RTJ | 14.63 | 18.63 | 21.63 | 28 | 33.13 | 39.37 | 45.12 | 50.25 | 55.37 | 61.37 | 66.37 | 77.63 |
L3:BW | 14.5 | 18.5 | 21.5 | 27.75 | 32.75 | 39 | 44.5 | 49.5 | 54.5 | 60.5 | 65.5 | 76.5 |
H | 10.51 | 11.65 | 13.98 | 18.31 | 21.26 | 22.64 | 26.38 | 28.54 | 31.89 | 35.63 | 39.57 | 44.27 |
RF | 161 | 276 | 467 | 1,067 | 2,356 | 3,663 | 5,445 | 7,128 | 9,700 | 13,060 | 16,130 | 23,265 |
(bs) BW | 119 | 209 | 362 | 813 | 1,910 | 2,930 | 4,310 | 5,600 | 7,720 | 10,395 | 12,770 | 17,820 |
Tilting Disc Check Valve
- Cast Steel TiltingDisc Check Valve
- Bolted Cover,Horizontal Lines
- Designed toASME B16.34.API6D
Face to Face | ASME/ANSI B16.10 |
End Flange | ASME/ANSI B16.5 |
Butt Weld | ASME/ANSI B16.25 |
Class | ASME/ANSI CL 150/300/600 |

CLASS 150 DIMENSION | |||||||||||||||||
SIZE | 2″ | 2-1/2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ | 26″ | 28″ | 30″ | 32″ |
L | 203 | 216 | 241 | 292 | 356 | 495 | 622 | 698 | 787 | 864 | 978 | 978 | 1295 | 1295 | 1143 | 1143 | 1194 |
D | 160 | 182 | 196 | 230 | 300 | 390 | 432 | 510 | 540 | 635 | 700 | 770 | 900 | 930 | 991 | 1020 | 1150 |
W | 178 | 198 | 224 | 252 | 326 | 426 | 456 | 530 | 576 | 670 | 740 | 818 | 948 | 988 | 1050 | 1090 | 1240 |
W.T(kg) | 11 | 16 | 22 | 34 | 62 | 112 | 169 | 238 | 337 | 420 | 550685 | 685 | 910 | 1055 | 1260 | 1540 | 1860 |
CLASS 300 DIMENSION | |||||||||||||||||
SIZE | 2″ | 2-1/2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ | 26″ | 28″ | 30″ | 32″ |
L | 267 | 292 | 318 | 356 | 444 | 533 | 622 | 711 | 838 | 864 | 978 | 1016 | 1346 | 1346 | 1295 | 1372 | 1448 |
D | 170 | 196 | 214 | 245 | 320 | 400 | 460 | 540 | 580 | 660 | 725 | 800 | 940 | 970 | 1040 | 1080 | 1210 |
W | 198 | 220 | 232 | 268 | 360 | 426 | 457 | 572 | 620 | 690 | 760 | 848 | 988 | 1018 | 1250 | 1280 | 1350 |
W.T(kg) | 17 | 22 | 32 | 97 | 110 | 162 | 228 | 380 | 443 | 530 | 780 | 980 | 1320 | 1364 | 1762 | 2050 | 2870 |
CLASS 600 DIMENSION | |||||||||||||
SIZE | 2″ | 2-1/2″ | 3″ | 4″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
L | 292 | 330 | 356 | 432 | 559 | 660 | 787 | 838 | 889 | 991 | 1092 | 1194 | 1397 |
D | 185 | 196 | 210 | 270 | 340 | 440 | 520 | 570 | 610 | 690 | 755 | 850 | 990 |
W | 212 | 225 | 240 | 298 | 405 | 460 | 492 | 602 | 650 | 710 | 780 | 902 | 1040 |
W.T(kg) | 27 | 44 | 47 | 115 | 190 | 320 | 430 | 586 | 750 | 1015 | 1480 | 2050 | 2550 |
Swing Check Valve Working Principle

Swing Check Valve: Structural Features
Maintenance of Swing Check Valve
Keep the valve clean
- Regularly wipe off dust and dirt.
Conduct regular inspections
- Check for leaks.
- Replace the valve if significant leakage is found.
- Inspect for corrosion, rust, and wear.
- Monitor the pressure and temperature of the fluid to ensure they are within the valve’s limits.
Valve replacement procedure
- Thoroughly clean the removed valve with the appropriate hydraulic liquid or medium.
- Inspect for debris, scratches, corrosion, wear, or rough surfaces.
- Smooth and lap any rough areas before reassembling the valve.
Storage recommendations
- Keep the valve lubricated in a dry, ventilated room to prevent moisture, rain, and rust.
- Ensure the valve’s opening and closing parts are in the closed position during storage or transportation.
- Fix the valve disc in the open position.
- Block the inner ports at both ends with foam plates, and tightly plug the ports with stuffed caps to prevent dust and rust.
Long-term storage
- Regularly check the valve if stored for an extended period (every three months).
- Inspect for dirt, rust, and the condition of the sealing surface and welding joints.
- After cleaning, reapply anti-rust oil for protection.

Product Standards
- Design Standard: API602, ASME B16.34, API6D ensure performance, safety, and reliability for various industries.
- Structure Length: Compliant with ASME B16.10, ensuring compatibility with existing piping systems.
- Material and Temperature: ASME B16.34 specifies materials and temperature limits for durability and performance in demanding conditions.
- Inspection Standard: API598 and API6D standards ensure valves are tested for leaks, pressure, and operational integrity.
Application of Swing Check Valve
- Suitable Media: Water, steam, oil, nitric acid, acetic acid, strong oxidizing media, and urea, ensuring versatility in various applications.
- Common Industries: Petroleum, chemical, pharmaceutical, fertilizer, and power industries, supporting essential operations across sectors.
- Recommended Use: Ideal for clean media, preventing contamination and maintaining operational efficiency.
- Not Recommended For: Media containing solid particles, high viscosity, or low-flow, pulsating conditions, as these can cause damage to the valve disc and seat, impacting performance.
Installation and Uses of Swing Check Valve
The Rotary Kai Type Check Valve is designed for vertical installation on horizontal pipes and should be prioritized on official road levels. It can also be installed on vertical pipes with a bottom-up medium flow.
Pre-installation Steps:
- Remove the stuffy cover and foam plate from both ends of the valve channel.
- Clean the valve disc and inner cavity, removing any grease and debris.
- Check the valve disc movement by pushing it away from the seat to ensure it moves freely.
- Inspect valve ends for burrs or edges that could affect sealing.
Installation Guidelines:
- Ensure the valve is installed in the direction of the flow arrow.
- For vertical installation, the flow should be from bottom to top.
- For horizontal installation, the cover should be at the top with upward flow.
Medium Requirements: The medium should be free of hard particles to avoid damage to the valve’s sealing surface.
Fault and Troubleshooting
Preventive Maintenance Tips
- Fault location: Leakage at the connection between the valve cover and the valve body.
- The cause of the failure:
- The nut of the connecting bolt is not tightened, or the cloth is evenly loosened.
- The sealing surface of the middle flange is damaged or has dirt.
- The gasket is damaged.
- Solution:
- Tighten the nut evenly.
- Repair the sealing surface and remove dirt.
- Replace the gasket.
- Fault location: Leakage at the sealing surface of the valve disc and the valve seat.
- The cause of the failure:
- The nut of the connecting bolt is not tightened, or the cloth is evenly loosened.
- The sealing surface of the middle flange is damaged or has dirt.
- The gasket is damaged.
- Solution:
- Open the valve body and clean it.
- Re-grind or re-process.
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Additional General Insights Here
Specs of Swing Check Valve
One-Way Flow Mechanism
Rapid Closure System
Low-Pressure Drop
Features of Swing Check Valve
Durable Construction
Swing Check Valves are crafted from high-grade stainless steel and other durable materials, providing resistance to corrosion and wear even in challenging industrial environments. This strong construction supports a longer lifespan for the valves and withstands high pressure and temperature variations.
Reliable Backflow Prevention
These valves feature a swing disc that allows flow in one direction and automatically closes to prevent reverse flow. The swing mechanism is designed for minimal pressure drop and efficient flow control. On top of that, the precision-fit disc and seat create a tight seal, preventing leakage and maintaining system integrity.
Easy Installation and Maintenance
Swing Check Valves feature flanged or threaded connections for easy installation and a removable bonnet for quick maintenance. NTVAL’s design simplifies servicing, reducing downtime, and ensures compatibility with various piping systems.
Benefits of Swing Check Valve
Enhanced Operational Efficiency
Swing Check Valves provide efficient flow control, minimizing energy loss in the system, leading to reduced operational costs and improved system performance. The low-maintenance design contributes to higher overall efficiency, while reliable backflow prevention maintains consistent operation and prevents system disruptions.
Long-Term Cost Savings
The durable materials and strong construction of Swing Check Valves extend their lifespan, reducing the need for frequent replacements and costly repairs. Easy maintenance features lower upkeep costs and minimize downtime. Reliable prevention of backflow and leakage protects the system from potential damage, resulting in further cost savings and improved operational efficiency.
Versatility and Adaptability
Swing Check Valves are suitable for various industrial applications, including oil, chemical, and water treatment plants. Their ability to handle different mediums and withstand harsh conditions makes them highly versatile. Easy installation and compatibility with standard piping systems enhance their adaptability, making them effective in diverse operational settings.
Applications of Swing Check Valve
Petrochemical Industry
Water and Sewage Treatment
Steam and Boiling Systems
Mining and Mineral Processing


3 Considerations When Buying Swing Check Valve
01
Uses Stainless Steel 316
02
Pressure Ratings of 150 PSI to 300 PSI
03
Valve Size of ½ Inch to 24 Inches
FAQs About Swing Check Valve
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