When infrastructure projects require reliable backflow prevention for water and wastewater systems, engineers worldwide turn to specialized manufacturers with proven expertise in rubber products. Shanghai Songjiang Jingning Shock Absorber Co., Ltd. , headquartered in the historic Songjiang District of Shanghai, has established itself as one of China’s leading suppliers of rubber duckbill valves and pipeline equipment . With nearly two decades of manufacturing excellence, the company serves municipal, industrial, and infrastructure projects across China and international markets . This post explores Jingning’s capabilities, product offerings, and how their rubber duckbill valves are protecting critical water infrastructure globally.
The Jingning Story: Excellence Since 2004
Shanghai Songjiang Jingning Shock Absorber Co., Ltd. was established in April 2004 with registered capital of 20 million RMB . The company operates from its manufacturing facility located at No. 8 Minta Road, Shihudang Town, Songjiang District, Shanghai . Over the past 22 years, Jingning has grown from a small operation with just a few vulcanizing machines into a major manufacturer with over 40 vulcanizing machines, large-scale rubber refining equipment, automatic fabric cutters, automatic molding machines, automatic welding machines, and automatic corrugation machines .
The company’s facility spans over 30 acres and employs more than 100 skilled workers . Their annual production capacity is impressive: over 1 million rubber joints and more than 300,000 steel pipeline equipment units including compensators and expansion joints . This scale demonstrates Jingning’s position as a leading supplier in China’s pipeline equipment industry.
Jingning maintains strong technical partnerships with research institutions including the Shanghai Rubber Products Research Institute and the Shanghai Water Supply and Drainage Research Institute . These collaborations ensure their products incorporate the latest material science and engineering advancements .
The company is ISO 9001 certified, reflecting their commitment to quality management systems across design, manufacturing, and service operations . Their products are manufactured in accordance with industry standards including the Chemical Industry Standard of the People’s Republic of China HG/T2289-2001 for rubber joints .
Rubber Duckbill Valves: Reliable Backflow Prevention
A duckbill valve is a one-way check valve with a flexible rubber sleeve molded into the shape of a duck’s bill. Forward flow pressure opens the bill, allowing fluid to pass with minimal resistance. When flow stops or reverses, the bill instantly collapses, creating a tight seal that prevents backflow. Jingning’s rubber duckbill valves are manufactured using high-quality rubber compounds selected for durability, corrosion resistance, and long service life .
Jingning’s duckbill valves are designed to handle demanding applications in water and wastewater systems. Their rubber construction offers significant advantages over metal check valves:
- No moving parts means nothing to rust, seize, or mechanically fail
- Self-cleaning design allows solids and debris to pass without clogging
- Corrosion resistance ensures long-term reliability in harsh environments
- Quiet operation eliminates water hammer and mechanical noise
Duckbill Valve Product Line
Based on industry classification, Jingning’s duckbill valves are available in several configurations to suit different installation requirements . The primary types include:
| Valve Type | Description | Key Features | Typical Applications |
|---|---|---|---|
| Flanged Type Duckbill Valves | Designed with integral flanges for direct bolting between standard pipe flanges. Provides secure, permanent installation in pipeline systems . | – Flanged connections for leak-proof sealing – Available in various sizes – Easy installation and removal | Municipal water lines, wastewater treatment plants, industrial process lines |
| Slip-on Type Duckbill Valves | Cylindrical rubber sleeve designed to slip onto the end of a pipe or through a wall penetration. Secured with stainless steel clamps . | – Simple, cost-effective installation – Ideal for end-of-pipe applications – No flanges required | Outfall lines, stormwater discharge, pond outlets, manhole installations |
| Custom-Engineered Duckbill Valves | Special designs for unique application requirements, including specific materials, sizes, or pressure ratings . | – Tailored to customer specifications – Optimized for specific media and conditions | Specialized industrial processes, unique infrastructure projects |
Jingning’s rubber duckbill valves are part of their comprehensive pipeline equipment product line, which also includes rubber joints, expansion joints, compensators, pipe dismantling joints, and various other pipeline accessories .
Key Industries and Applications
Jingning’s duckbill valves serve critical functions across a wide range of applications :
Municipal Drainage Systems
The largest application for duckbill valves is municipal drainage infrastructure. These valves prevent backflow in stormwater systems, ensuring that heavy rains or tidal surges do not cause flooding in urban areas. Jingning’s valves are installed in drainage networks throughout China, protecting cities from water damage.
Wastewater Treatment Plants
In sewage treatment facilities, duckbill valves handle raw sewage, sludge, and effluent without clogging. Their rubber construction allows solids to pass while maintaining reliable backflow prevention. Jingning’s products are used in treatment plants across China and international markets .
Dam Drainage
Duckbill valves are essential components in dam infrastructure, providing reliable backflow prevention and pressure relief in drainage systems. Their maintenance-free operation is particularly valuable in remote locations .
Industrial Applications
Jingning’s products serve industries including power generation, metallurgy, chemical processing, and petrochemical facilities . Their rubber duckbill valves handle cooling water, process fluids, and wastewater in industrial settings.
Water Supply Systems
For clean water applications, Jingning’s valves provide reliable backflow prevention in municipal water distribution networks and industrial water supply systems .
Global Distribution and Contact Information
Jingning products are distributed throughout China and exported to international markets including Southeast Asia, the Middle East, Eastern Europe, and other regions . The company maintains a network of sales offices and representatives across China to serve domestic customers.
Primary Contact Information:
- Company Website: http://www.shjnjzq.com
- Phone: 021-66523137 (Sales)
- Phone: 400-6767-229 (Toll-Free Hotline)
- Phone: 021-66305610 (General Inquiries)
- Fax: 021-66300560
- Email: [email protected]
- Contact Person: Yuan Keshuai (Sales Manager)
- Mobile: 13585800300 (Available on WhatsApp/WeChat)
Company Address:
- Factory/Office: No. 8 Minta Road, Shihudang Town, Songjiang District, Shanghai, China 松江区石湖荡镇闵塔路8号标房-33
For international inquiries, the company welcomes contact via email or phone. They maintain the capability to export products worldwide and can provide customized solutions for specific project requirements .
Authorized Distributors:
Based on available information, Jingning products are available through:
- Direct Sales from Factory: The company sells directly to customers, eliminating intermediary costs and ensuring clear communication of technical requirements.
- Regional Sales Offices: Jingning maintains sales offices throughout China to serve domestic customers.
- International Trade Department: For export customers, the company’s international trade team handles all shipping and documentation requirements.
To find a distributor in your region, contacting the Shanghai headquarters directly is the most effective approach.
Recent News and Industry Recognition
Recognized in Global Market Reports
Shanghai Songjiang Jingning Shock Absorber Co., Ltd. is consistently recognized in international market research reports as a leading global manufacturer of duckbill valves . The company is listed alongside industry giants such as Red Valve, Cla-Val, EVR Products, and Proco Products in comprehensive market analyses .
2025 Market Position
According to the “China Duckbill Valve Market Research Report,” Jingning continues to be one of China’s premier duckbill valve manufacturers, with significant market share in the domestic market and growing international presence .
ISO 9001 Certification
The company maintains ISO 9001 certification, demonstrating ongoing commitment to quality management and continuous improvement .
Technical Innovation
Through ongoing collaboration with the Shanghai Rubber Products Research Institute and Shanghai Water Supply and Drainage Research Institute, Jingning continues to advance its rubber compound formulations and product designs .
Production Capabilities and Quality Assurance
Jingning’s manufacturing facility is equipped with state-of-the-art equipment for rubber processing and metal fabrication . Their quality control process includes:
- Raw Material Testing: All incoming rubber compounds and metals are tested for compliance with specifications
- In-Process Inspection: Products are inspected at each stage of manufacturing
- Final Testing: Finished valves undergo pressure testing and visual inspection before shipment
- Third-Party Quality Control: The company uses第三方 (third-party) quality verification to ensure objective assessment
With over 500 rubber joint molds and comprehensive testing capabilities, Jingning can produce a wide range of sizes and configurations to meet customer requirements .
Conclusion
For over 22 years, Shanghai Songjiang Jingning Shock Absorber Co., Ltd. has demonstrated that Chinese manufacturing excellence can compete on the global stage. Their rubber duckbill valves, backed by ISO 9001 certification and technical partnerships with leading research institutes, provide reliable, maintenance-free backflow prevention for municipal drainage, wastewater treatment, dam drainage, and industrial applications.
Whether you need a flanged duckbill valve for a municipal water project, a slip-on valve for stormwater outfall protection, or a custom-engineered solution for a unique application, Jingning’s experienced engineering team and modern manufacturing facility can deliver the quality and performance your project demands.
Contact Shanghai Songjiang Jingning Shock Absorber Co., Ltd. today at 021-66523137 or visit www.shjnjzq.com to discuss your duckbill valve requirements and discover why engineers across China and around the world trust Jingning for their critical infrastructure projects.