Rubber Flap Check Valve
 | Rubber Flap Check Valve
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Rubber Flap Check Valve ：
Product Overview
The rubber flap check valve is mainly composed of three parts: ductile iron body, cover, and reinforced rubber flap. The rubber flap is constructed with steel plate, steel bar, and reinforced nylon cloth as the base, fully coated with rubber. This design enables a service life of over 1 million opening and closing cycles. Featuring a full-flow design, the valve offers low head loss, minimal debris accumulation, and easy maintenance. It is widely used in water supply and drainage systems, installed at pump outlets to prevent backflow and water hammer damage to pumps. It can also be installed on bypass pipes of reservoir inlet/outlet lines to stop sewage from flowing back into the tank.
Working Principle
When fluid flows forward, the pressure lifts the rubber flap to open the valve, allowing full flow with minimal resistance. When backflow occurs, the reverse fluid pressure presses the flap tightly against the seat to seal the valve, preventing backflow. The flexible rubber flap design absorbs impact during closing, eliminating water hammer and noise effectively.
Key Specifications & Materials
• Nominal Size: DN50 ~ DN600
• Pressure Rating: PN10 / PN16 / PN25
• Shell Test Pressure: 1.5 / 2.4 / 3.75 MPa
• Seal Test Pressure: 1.1 / 1.76 / 2.75 MPa
• Body & Cover Material: QT450-10 Ductile Iron
• Flap Material: Reinforced rubber with steel/nylon base (QT450 lined with NBR) • Seal Material: NBR (Nitrile Butadiene Rubber)
• Working Temperature: ≤80°C
• Applicable Media: Clean water, sewage, and water-like liquids
• Execution Standard: GB/T 13932-2016
Product Advantages
1. Ultra-Long Service Life: Reinforced rubber flap design ensures over 1 million opening/closing cycles, with excellent wear and corrosion resistance.
2. Low Head Loss & Energy Saving: Full-flow straight-through design minimizes flow resistance, reducing pump energy consumption.
3. Anti-Clogging & Easy Maintenance: The smooth flow path prevents debris buildup; simple structure allows quick inspection and replacement of parts.
4. Water Hammer & Noise Elimination: Flexible rubber flap absorbs closing impact, eliminating water hammer and operational noise to protect pumps and pipelines.
5. Versatile Installation: Can be installed horizontally at pump outlets, or on bypass lines of reservoirs, adapting to various system layouts.
Applications
• Municipal water supply and drainage systems
• Pump station outlet pipelines
• Building water supply and sewage systems
• Reservoir and water tank bypass lines
• HVAC circulating water systems
• Industrial wastewater treatment pipelines
