Swing Check Valve Manufacturer In China
The pressure-bearing parts of the valve are cast using a precision casting process, the surface quality is beautiful, there are no surface defects such as rust, cold segregation, etc., and the internal quality is stable, without porosity, pores, cracks.
Various Types Of Our Swing Check Valve
Lift check valve can adopt various configuration flange standard and flange sealing surface type, to meet various engineering needs and user requirements.
Axial Flow Check Valve With streamlined design, low noise, energy saving, environmental protection, small pressure loss of medium through the valve, long service life, no blockage in opening and closing, reliable operation, low pressure sealing and low pressure opening
The design and manufacture of forged steel swing check valves according to the requirements of API602 and ASME16.33 mainly include A105N.
The closure stroke of the disc check valve of the clamp type double disc check valve is short, and it is spring-loaded, which can significantly reduce water hammer.
Application Scenarios Swing Check Valve
The quality of the swing check valve body is stable, the casting organization is dense, and no casting defects such as porosity, shrinkage, and cracks have been found after inspection, which can meet the safety transmission requirements of natural gas medium under high pressure conditions.
The valve body and valve seat of the swing check valve are made of iron-based alloy or cobalt-based hard alloy cladding layer, the cladding layer is dense and well-bonded, and the hardness and penetration inspection are qualified.
The swing type check valve has a complete specification of valve body material, and the gasket can be reasonably selected according to the actual working conditions or user requirements.
The swing check valve features an internally mounted connection structure between its pivot pin and disc, where the pin does not penetrate the pressure-bearing boundary of the valve body.
Sealed reliable swing check valve
The swing check valve valve body and valve cover are connected by flange, bolt connection, and the flange sealing method is convex and concave and octagonal ring gasket. The gaskets are all metal-wound gaskets with inner rings filled with graphite or Teflon (completely abandoning the conventional use of rubber asbestos gaskets). The gaskets are reliable and have excellent disassembly and reassembly performance.
Our swing check valve manufacturer in China.
Longz has more than 400 production and testing equipment such as large horizontal machining center and vertical machining center. CAD valve design center, three-dimensional simulation manufacturing design system, valve testing center and test platform have been set up to optimize product structure and ensure the quality and speed of new product development and production.
- The main link dimensions of the swing check valve
- Certificates
| NPS in | DN mm | L | D | D1 | D2 | b | Z-Φd | H |
|---|---|---|---|---|---|---|---|---|
| Class150 | ||||||||
| 2″ | 50 | 203 | 157 | 120.7 | 92 | 19.5 | 4-Φ19 | 161 |
| 2 1/2″ | 65 | 216 | 178 | 139.7 | 105 | 22.5 | 4-Φ19 | 180 |
| 3″ | 80 | 241 | 190.5 | 152.4 | 127 | 24 | 4-Φ19 | 190 |
| 4″ | 100 | 292 | 229 | 190.5 | 157.2 | 24 | 8-Φ19 | 220 |
| 6″ | 150 | 356 | 279 | 241.5 | 216 | 25.5 | 8-Φ22.5 | 257 |
| 8″ | 200 | 495 | 343 | 298.5 | 270 | 29 | 8-Φ22.5 | 292 |
| 10″ | 250 | 622 | 406 | 362 | 324 | 30.5 | 12-Φ25 | 350 |
| 12″ | 300 | 698 | 483 | 432 | 381 | 32 | 12-Φ25 | 398 |
| 14″ | 350 | 787 | 533 | 476.8 | 413 | 35 | 12-Φ29 | 445 |
| 16″ | 400 | 864 | 597 | 539.8 | 470 | 37 | 16-Φ29 | 490 |
| 18″ | 450 | 978 | 635 | 577.8 | 533 | 40 | 16-Φ32 | 520 |
| 20″ | 500 | 978 | 698 | 635 | 584 | 43 | 20-Φ32 | 546 |
| 24″ | 600 | 1295 | 813 | 749.3 | 692 | 48 | 20-Φ35 | 880 |
| Class300 | ||||||||
| 2″ | 50 | 267 | 165 | 127 | 92 | 22.5 | 8-Φ19 | 179.5 |
| 2 1/2″ | 65 | 292 | 190 | 150 | 105 | 25 | 8-Φ22 | 190 |
| 3″ | 80 | 318 | 210 | 168 | 127 | 29 | 8-Φ22.5 | 212.4 |
| 4″ | 100 | 356 | 254 | 200 | 157 | 32 | 8-Φ22.5 | 246 |
| 6″ | 150 | 445 | 317.5 | 269.7 | 216 | 37 | 12-Φ22.5 | 292 |
| 8″ | 200 | 533 | 381 | 330 | 270 | 41.5 | 12-Φ25.5 | 328 |
| 10″ | 250 | 622 | 444.5 | 387 | 324 | 48 | 16-Φ28.5 | 378.6 |
| 12″ | 300 | 711 | 521 | 451 | 381 | 51 | 16-Φ32 | 420 |
| 14″ | 350 | 838 | 584 | 514 | 413 | 54 | 20-Φ32 | 470 |
| 16″ | 400 | 864 | 648 | 572 | 470 | 57 | 20-Φ35 | 530 |
| 18″ | 450 | 978 | 711 | 629 | 533 | 60 | 24-Φ35 | 584 |
| 20″ | 500 | 1016 | 775 | 686 | 584 | 64 | 24-Φ35 | 610 |
| 24″ | 600 | 1346 | 914 | 813 | 692 | 70 | 24-Φ41 | 860 |
| Class600 | ||||||||
| 2″ | 50 | 292 | 165 | 127 | 92 | 25 | 8-Φ19 | 203 |
| 2 1/2″ | 65 | 330 | 190 | 150 | 105 | 29 | 8-Φ22 | 229 |
| 3″ | 80 | 356 | 210 | 168 | 127 | 32 | 8-Φ22 | 235 |
| 4″ | 100 | 432 | 273 | 216 | 157 | 38 | 8-Φ25 | 286 |
| 6″ | 150 | 559 | 356 | 292 | 216 | 48 | 8-Φ29 | 330 |
| 8″ | 200 | 660 | 419 | 349 | 270 | 56 | 12-Φ29 | 381 |
| 10″ | 250 | 787 | 508 | 432 | 324 | 64 | 12-Φ32 | 457 |
| 12″ | 300 | 838 | 559 | 489 | 381 | 67 | 16-Φ35 | 584 |
| 14″ | 350 | 889 | 603 | 527 | 413 | 70 | 20-Φ38 | 635 |
| 16″ | 400 | 991 | 686 | 603 | 470 | 76 | 20-Φ41 | 684 |
We purchased more than 40 DN50 swing check valves for a set of city natural gas connection package. For us, it is important that the documents are complete: the material certificate, the water pressure test record, and the third-party inspection report all arrived with the goods, and the hot number on the label matches the certificate. The delivery was made within the window we agreed upon.
Project ManagerBrazil Lupatech S.A.We are most concerned about the sealing under low pressure. Many swing check valves we have tried before leak here. Longz’s batch of swing check valves has been used on three gas stations for more than a year, and the sealing test of the valve seat is in line with the requirements.
EngineerSaudi Gas Company
This swing check valve is suitable for water, natural gas, oil products, etc.
The valve disc of the rotary type check valve rotates around the rotary shaft. Its fluid resistance is generally less than that of the lift-type check valve, and it is suitable for use in larger diameters and larger pressure differences.
The applicable temperature of this swing check valve order is -29 to 120 ℃.
Our main standards are technical standards such as API6D.
As a leading swing check valve manufacturer** with a 50,000+ sqm Industry facility, Longz designs and tests all heavy-duty valves in strict compliance with API 6D and ASME B16.34 standards, providing full material traceability and mill test certificates for EPC contractors.
Built for extreme durability, our industrial swing check valve solutions are engineered to withstand continuous cycle operations. Field data from demanding overseas projects—including major gas grids in Spain and the Middle East—proves our valves operate reliably for over 1 to 2 years with zero mechanical failure.
Yes, as a direct custom swing check valve manufacturer, we specialize in tailoring dimensions, pressure ratings, and body materials (such as 316L stainless steel and forged steel) to meet the unique specifications of complex global pipeline projects.
For highly corrosive chemical and petrochemical media, we recommend our premium stainless steel swing check valve options (such as 316L or duplex stainless steel). Our internal pin-and-disc design also eliminates potential external leakage points to maximize plant safety.
Leveraging our smart manufacturing base and well-maintained stock of forged and cast components, we ensure rapid order fulfillment and stable supply chains, making us a dependable swing check valve supplier that prevents costly project delays.
EPC contractors, project managers, and distributors can easily click the “instant quote” button on our website and contact our direct swing check valve factory team to ensure a transparent, detailed quote within 24 hours with no hidden fees.
Advantages of swing check valve
The sealing surface of the valve seat and the valve body is welded with iron-based alloy or Stellite hard alloy, which is wear-resistant, heat-resistant, corrosion-resistant, has good abrasion resistance, and has a long service life.
Various piping flange standards and flange sealing surface types can be used to meet various engineering needs and user requirements.
The valve body material is complete, and the gasket can be reasonably selected according to the actual working conditions or user requirements, which can be suitable for various pressure, temperature and medium working conditions.
The valve disc rotates around the pin outside the seat to reduce violent impact when closing.
The connection between the pin and the valve disc adopts an internal structure, eliminating external leakage points and ensuring more reliable operation.