Description of Rubber Duckbill Check Valves
Open and close automatically in security and reliability according to hydraulic difference without noise and in no need of operator and maintenance.
Positive start has little water resistance and start-up pressure and the flow can be adjusted naturally according to hydraulic pressure.
Reserve cut-off has good seal without leakage to prevent from flowing backwards. The back pressure is higher and the effect is barrier.
Anticorrosion, aging resistance, deformation resistance, strong adaptability and long use life
Wide size scope, nominal diameter of DN50-DN3000.

Application
Sewage system
Discharge system
Dyke discharge
Drainage of airport and freeway
Sewer discharge
Sewage lagoon discharge
Smell separation

See more at 
http://www.chinarubberexpansionjoint.com/product/Valve/Flexible_Rubber_Duckbill_Check_Valves_X81.html
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