Duckbill Check Valve is also named rubber slow close check valve duckbill check valve, which has special structure like duckbill. It is one new water supply and drainage valve which has the function of discharge in positive direction while non-return in opposite direction. It can be widely applicable to be mounted on the discharge outlet of municipal, water works, waste water treatment projects to prevent back flow, so that it has various advantages of slow close, silence, free maintenance and non-corrosive features.
APPLICATIONS
Duckbill Check Valve can prevent of the flood and waste water flowing back into sewer and basement. It can prevent the flood from flowing back into city, sewage treatment works and drainage pump station when the water level rises. And it has many other applications, too.
Ball Valve 
