The large-diameter DN1800 duckbill valve features an all-rubber flexible check structure that opens and closes automatically by medium pressure differential. Compared with conventional steel flap gates and butterfly check valves, it delivers remarkable advantages and is widely deployed in large-scale water conservancy and municipal drainage projects.

Advantages of Flanged Rubber Duckbill Valves

1.Constructed as an integral all-rubber component with no mechanical spindles or moving opening/closing parts, the valve is immune to rust and corrosion. Even when sediment, stones or debris lodge at the valve outlet, the rubber’s elasticity enables tight sealing, fundamentally eliminating jamming and leakage issues.

2.Opening and closing is fully driven by fluid pressure differential without electric control or manual operation. It operates quietly without slamming noise and requires minimal head loss to open, cutting energy consumption for drainage.

3.No routine maintenance or lubrication is needed, with a service life of over ten years. Available in flanged and socket-end connection designs, it fits steel pipes, concrete pipes and FRP large-bore pipelines for easy installation and lower overall project cost.

4.Optional rubber compounds including nitrile rubber, neoprene and EPDM provide excellent resistance to acid, alkali and seawater corrosion, suiting harsh working conditions with sewage, sludge and saltwater.

Application Scope

The valve is commonly installed on main urban drainage pipelines and effluent outlets of large wastewater treatment plants to prevent backflow of inland floodwater into plants and municipal pipe networks during flood seasons. For coastal docks and coastal flood drainage projects, it replaces bulky steel flap gates to block tidal seawater backflow. It is also fitted at spillways of reservoirs & dykes and outlet ends of large drainage pump stations to ensure high-flow flood discharge and prevent reverse flow when pumps shut down. In addition, it serves as a one-way check device for main rainwater drainage lines at expressways and airports, as well as industrial wastewater trunk lines of chemical parks, blocking odour escape and securing pipe networks against backflow.

With 20 years of manufacturing experience, Jinbin Valve specializes in customized design and production of industrial valves including sluice gates, cone valves, blind valves, air dampers, butterfly valves, gate valves and flap gates. We provide one-on-one technical support and tailor-made valves to match clients’ specific operating conditions. Please leave your inquiry below if you have any requirements, and we will reply within 24 hours.