Duckbill valve can effectively prevent backflow backflow and sediment generation, and the previous fixed round pipe outlet is different: duckbill valve jet velocity and outlet flow is a complex non-linear relationship, the test shows that the duckbill valve discharge of sewage to achieve the flow rate required for effective mixing, much smaller than the same mixing required for round pipes, the flow rate of different valve port flow characteristics of various tests, while these tests The data were analyzed to derive a general two-dimensional internal dynamics equation. The results of these tests showed that the use of duckbill-shaped valves resulted in more stable diffusion, along with high jet velocities and high energy, and laser velocimetry was used to study the vicinity of the mixing area of the jet stream at the duckbill valve port, and the results showed that the duckbill-shaped discharge port had better diffusion than the standard circular port.
