Functions Of Duckbill Valves

Rubber duckbill valves prevent floodwater and sewage from flowing back into street sewers and basements, avoiding major losses. They prevent floodwater from flowing back into sewage treatment plants and drainage pumping stations when water levels rise; they prevent the spread of sewage or odorous fluids and allow for drainage at any time; during the rainy season, they prevent urban river floodwater from flowing back into the streets from the sewers; their quality is superior to flap valves, overcoming some defects of flap valves such as incomplete closure.