Duckbill Valve Overview
Common Names:
Rubber Sewage Check Valve, Rubber Check Valve, Rubber Non-Return Valve
Key Characteristics
No moving parts: A flexible rubber check valve designed for:
Wastewater discharge systems
Stormwater drainage systems
Underground parking drainage
Primary functions:
Odor containment
Prevention of sewage backflow
Protection against floodwater intrusion into basements or municipal pipelines
Working Principle
Opening mechanism:
The valve opens when liquid flows through it.
The opening amplitude increases proportionally with flow rate/pressure.
Closing mechanism:
Closes automatically via backpressure or atmospheric pressure when flow stops.
Requires minimal opening pressure (typically 250 Pa water head difference).
Applications & Advantages
Wastewater treatment:
Installed at pump discharges, lifting stations, and submersible systems.
Key features:
Elastic rubber structure requires zero maintenance.
Seals tightly even when clogged by solid particles.
Flood prevention:
Blocks floodwater/sewage backflow into streets, basements, and drainage stations.
Odor & backflow control:Acts as a water seal to prevent:
Sewer gas backflow from outdoor inspection wells
High-water-level backflow into buildings
Operational benefits:
Frost-resistant during opening/closing cycles
Low head loss
Customizable for specific conditions/materials
Extended service life
Sealing performance:
Quick operation with excellent sealing
Meets water/gas sealing requirements for indoor/outdoor drainage interfaces
Sediment prevention:
Effectively inhibits backflow and sediment accumulation
Enhanced diffusion:
Achieves superior effluent mixing at lower velocities compared to circular pipes
Jet flow characteristics:
Duckbill-shaped outlet provides stronger jet velocity and better diffusion than standard circular nozzles