Duck-bill check valves are commonly used for river outfalls at wastewater treatment plants, as well as for stormwater outlets where one-way service is required.

Similar to flap gates, duckbill check valves allow flow in one direction only. Duck-bill check valves seal themselves more tightly, since they are made of rubber or rubberized materials which seal tightly. Flap gates, on the other hand, are designed to leak without any significant differential head pressure behind them.

Duck-bill check valves have some additional advantages for service in outfall and overflow applications, too. They are non-slamming, leading to quiet operation, and are generally very good for corrosion resistance (where required). They're also very good for preventing backflow intrusion, even at high pressures.

Duckbill check valves are available in a range of materials, including:

• Pure gum rubber
• Neoprene
• EPDM
• Buna-N (nitrile)
• Hypalon^®
• Chlorobutyl
• Viton^®

Duck-bill check valves can be found in applications ranging from water-mixing systems to overflow vents, and from anti-siphon installations to floor drains. For more information, request a quote or more information on duckbill check valves.

last revised June 2009