Xh type flexible check valve features: flexible xh type check valve is also known as 'the duckbill valve', is a kind of special structure, with a 'duck mouth shape,' with 'forward flow, reverse check' function of the new type of water supply and drainage valves products. The valve does not have any active components, free of any maintenance. Can give a straight pipe, flange pipe, cement pipe, glass steel, widely used Yu Haian, beach, dock, reservoir, municipal human activities, sewage pool emissions, odor blocking, pump station system and other water drains. Xh type flexible check Industrial Valves can effectively prevent backflow intrusion and sediment generation, and the outlet of the fixed circular tube is different: duckbill valve of jet velocity and outlet flow show the complex nonlinear relationship and test show that the duckbill valve discharge sewage to achieve effective mixing, the required velocity than the round pipe of the same mix much smaller, the desired flow velocity in the valve port flow characteristics of different various experiment was carried out, at the same time to analyze these experimental data, a general two-dimensional internal dynamics calculation formula and the experimental results show that using the duck bill valve, can cause the diffusion is more stable, at the same time the jet velocity, energy is also big, use laser velocimetry of duckbill valve mouth jet mixing near area was studied, the results showed that the discharge outlet of duck bill than the standard circular nozzle have better diffusion effect. Xh type flexible check valve has a buffer, sound performance, maintenance free and no corrosion, etc. It in a sealed performance, work under the bad environment performance and improve water purification performance is far better than the door, solved the traditional flap valve or butterfly check valve for many mechanical trouble running status, big leakage, poor seat wear, deformation and corrosion, the noise big, often need to repair and replacement of technical problems. The valve is green environmental protection. In this paper, the keyword search: the check valve
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