The function of a swing check valve is to control the unidirectional flow of a medium. Its working principle is based on the synergistic effect of fluid mechanics and mechanical mechanics: When the medium flows in the forward direction, the fluid pressure acts on the valve disc's force-bearing surface, overcoming the valve disc's gravity and friction, pushing the valve disc to rotate upward around the pin axis to open. The medium flows smoothly along the streamlined channel with minimal flow resistance loss. When the medium tends to flow backward, the reverse fluid pressure, combined with the valve disc's gravity, forms a downward resultant force, pushing the valve disc to rotate rapidly and press against the valve seat to close, effectively preventing backflow and related safety hazards. Compared to lift check valves, its opening and closing action is smoother, with less interference to the medium flow, making it particularly suitable for large-diameter, low-to-medium flow velocity pipeline systems.
The DN200 ductile iron swing check valve features the following structural characteristics:
The valve body is made of QT450-10 ductile iron, superior in performance to gray cast iron; precise casting ensures a 100mm flow diameter. The streamlined flow path reduces resistance; the flange conforms to national standards for optimal sealing.
The disc is disc-shaped and can be made of ductile iron, stainless steel, etc.; internal reinforcing ribs prevent deformation. High-strength pin suspension allows for flexible rotation; embedded seals ensure leak-free operation.
Flange Connection: Commonly used, provides a strong seal, suitable for high pressure and high temperature, and easy maintenance.
Grooved Connection: No welding required, quick installation, good shock resistance and sealing, suitable for confined spaces such as municipal and fire-fighting applications.
High-end models are equipped with a buffer device to reduce water hammer; sewage discharge and inspection ports are provided for convenient maintenance.
| Commonly PN6/10/16, PN25 can be customized; PN>=pipeline working pressure | |
| Depending on the seal: NBR (-20~120℃), FKM (-20~180℃), PTFE (-50~200℃), metal seal (>=400℃) | |
| Water, oil; specially treated for corrosion resistance; wear-resistant parts selected for particulate matter. | |
| 300~500, higher Cv indicates stronger flow characteristics, used for calculating pressure loss. | |
| Opening pressure <=0.03MPa; smooth closing with low water hammer; valve body >=10 years, seals 1~5 years. |
Superior Corrosion Resistance: >=250μm electrostatic sprayed epoxy resin powder coating prevents rust and water pollution, resists acid and alkali soil corrosion, and provides a buried lifespan of 30-50 years.
Low Water Hammer Risk: The DN200 specification is equipped with a hydraulic buffer device or counterweight lever. Adjusting the counterweight controls the valve disc closing speed, protecting downstream pump units.
Convenient Online Maintenance: A large-diameter inspection cover on the top of the valve body allows for inspection or replacement of the valve disc and rocker arm without disassembling the valve, significantly reducing subsequent maintenance costs.
Urban water supply and drainage networks, water plant pump station inlets and outlets.
Cooling water circulation systems, circulating water systems in paper mills and power plants.
High-Rise Fire Protection
Backflow prevention devices for fire pump rooms.
Jintai Company provides product and project consulting services to help clients better understand their needs. These services include:
1. Professionalism: Ensuring the professionalism and accuracy of the products and services provided through project calculations and technical consultation.
2. Quality Assurance: Ensuring all products and services meet industry quality standards, improving reliability and durability.
3. Meeting Personalized Needs: Providing customized piping products to meet specific client needs, enhancing the personalization and practicality of the service.
4. System Integrity: Considering the overall requirements of the water system, the services and products provided are better integrated to meet the needs of the entire system.
5. Time and Cost Savings: Through professional consultation and calculations, clients can save time and costs in project planning and execution.
Shanxi Jintai Hongye Casting & Forging Machinery Co., Ltd. is located in Shanxi Province, China. Our primary business operations include ductile iron pipe fittings, pipeline systems, various valves, and manhole cover series products. For detailed product information or to discuss cooperation opportunities, please feel free to contact us at any time:
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