RUNXING’s
Flange Integral Duckbill Check Valve is a premium solution for drainage systems, featuring SS 304 construction and a built-in duckbill design. This
Duckbill Non Return Valve prevents backflow efficiently, suitable for storm drains and industrial applications. Durable, easy to install, and compliant with international standards, it delivers reliable performance and cost savings.
Product Overview
The Flange Integral Duckbill Check Valve for Drainage Systems is engineered to provide superior backflow prevention in various piping systems. Combining a robust flange integral structure with a flexible Duckbill Valve, this product ensures unobstructed forward flow while sealing tightly against reverse flow—eliminating the need for complex mechanical parts. Whether used in storm drains, wastewater treatment, or industrial pipelines, the Valve offers exceptional durability, corrosion resistance, and low maintenance, making it a preferred choice for global procurement professionals.
Our Inline Flanged Series Rubber Duckbill Check Valve stands out for its innovative design that adapts to varying flow rates, ensuring optimal performance even in harsh conditions. The integration of flange connections simplifies installation and ensures a secure fit, reducing leakage risks and installation time.
Technical Specifications
Core Specifications
- Material: Primary SS 304 (SUS304), optional SS 316 or SUS201; Rubber duckbill (EPDM, NBR, or Viton)
- Size Range: 2" to 48" (DN50 to DN1200)
- Pressure Rating: PN10, PN16, ANSI Class 150
- Temperature Range: -20°C to 120°C (-4°F to 248°F)
- Connection Type: Flange (EN 1092-1, ANSI B16.5, JIS B2220)
- Flow Direction: Unidirectional (forward flow)
- Sealing Performance: Zero leakage in reverse flow (test pressure up to 1.5x rated pressure)
- Weight: 5kg to 350kg (varies by size and material)
Performance Parameters
- Backflow Prevention Efficiency: 99.9%
- Flow Coefficient (Cv): 50 to 5000 (varies by size)
- Installation Angle: Horizontal or vertical (vertical installation recommended for optimal performance)
- Maintenance Requirement: None (self-cleaning design)
Product Features & Advantages
Key Design Features
- Integral Flange Structure: One-piece construction enhances structural integrity, reducing leakage points compared to assembled valves.
- Built-in Duckbill Valve: Flexible rubber duckbill automatically opens with forward flow and closes tightly against backflow—no mechanical hinges or springs.
- SS 304 Construction: High-quality stainless steel ensures corrosion resistance, extending service life in harsh environments (chemicals, saltwater, wastewater).
- Self-Cleaning Design: Smooth internal surface prevents debris buildup, maintaining consistent flow performance without maintenance.
- Wide Compatibility: Compatible with various piping materials (steel, PVC, HDPE) and international flange standards.
Competitive Advantages
- Superior Sealing: Outperforms traditional flapper valves with zero backflow, ideal for Storm Drain Flapper Valve applications.
- Low Energy Consumption: Minimal flow resistance reduces pumping costs compared to other check valve types.
- Easy Installation: Flange connections allow quick integration into existing systems, saving labor time.
- Long Service Life: Wear-resistant rubber and stainless steel materials ensure 10+ years of reliable operation.
- Cost-Effective: No maintenance costs, reduced downtime, and lower replacement frequency deliver long-term savings.
Working Principle
The Flange Integral Duckbill Check Valve operates on a simple yet effective principle: when fluid flows forward, pressure pushes the duckbill valve open, allowing unobstructed passage. When flow stops or reverses, the duckbill collapses, forming a tight seal that prevents backflow. The integral flange ensures the valve is securely fastened to the pipeline, while the flexible duckbill adapts to flow variations, maintaining sealing performance even at low backflow pressures.
How to Install & Use
- Prepare the Pipeline: Ensure the pipeline flange is clean, flat, and compatible with the valve’s flange standard (EN 1092-1, ANSI B16.5, etc.).
- Position the Valve: Align the valve’s flange with the pipeline flange, ensuring the duckbill’s flow direction (marked on the Valve Body ) matches the intended flow.
- Secure the Connection: Insert bolts through flange holes, add washers, and tighten nuts evenly using a torque wrench (follow recommended torque values for the size/pressure rating).
- Test for Leakage: Conduct a pressure test (1.5x rated pressure) to verify sealing performance—no leakage indicates successful installation.
- Operate Normally: The valve requires no additional operation; it automatically opens/closes with flow changes. Avoid sharp objects or excessive pressure that may damage the duckbill.
Application Scenarios
Our Flange Integral Duckbill Check Valve for Drainage Systems is versatile, suitable for the following industries and environments:
- Municipal Drainage: Stormwater systems, sewage treatment plants, and wastewater collection networks.
- Industrial Applications: Chemical processing, food & beverage, pharmaceutical, and manufacturing facilities (fluid transfer, wastewater discharge).
- Marine & Coastal: Port facilities, seawater intake/discharge, and offshore platforms (corrosion-resistant SS 304 design).
- Agriculture: Irrigation systems, farm drainage, and water storage facilities.
- Building Services: Roof drainage, basement sump pumps, and HVAC systems.
Customer Value Delivered: - Reduces water damage risks by preventing backflow in storm drains. - Lowers maintenance costs with self-cleaning, durable design. - Improves operational efficiency with minimal flow resistance. - Ensures compliance with environmental regulations for wastewater discharge. - Enhances system reliability, reducing downtime and replacement costs.
Customization Options
We offer flexible customization to meet your specific requirements:
- Material Customization: SS 316, SUS201, or special alloys for extreme environments; rubber materials (EPDM, NBR, Viton) for specific fluids.
- Size Customization: Non-standard sizes (beyond DN50-DN1200) available upon request.
- Pressure Rating Customization: Higher pressure ratings (PN25, ANSI Class 300) for industrial applications.
- Flange Standard Customization: Custom flange dimensions to match unique pipeline requirements.
- OEM/ODM Services: Branding, packaging, and design modifications for private label projects.
Production Process & Quality Control
- Raw Material Selection: Premium SS 304/316 stainless steel and rubber materials sourced from certified suppliers, with strict incoming inspection.
- Manufacturing: CNC machining for flange components, precision molding for Duckbill Valves, and integral assembly.
- Quality Inspection: Dimensional testing, pressure testing, leakage testing, and material composition analysis at each production stage.
- Finishing: Polishing, anti-corrosion treatment, and final inspection before packaging.
- Packaging: Export-standard packaging (wooden crates, anti-rust coating) to ensure product integrity during transportation.
With over 18 years of manufacturing experience and SGS factory audit certification, we maintain strict quality control systems to deliver consistent, high-quality products.
Contact Now
