How is Duckbill Check Valve working?

Duckbill check valves are unique, one-piece, elastomeric components that act as backflow prevention devices or one-way valves or check valves. They have elastomeric lips in the shape of a duckbill which prevent backflow and allow forward flow. The main advantage of duckbill valves over other types of one-way valves is that duckbill valves are self contained i.e. the critical sealing function is an integral part of the one piece elastomeric component as opposed to valves where a sealing element has to engage with a smooth seat surface to form a seal. Therefore duckbill valves are easily incorporated and assembled into a wide variety of devices without the hassle or problems associated with the surface finish quality of mating seats and/or complex assembly processes.

Other not less important features include:

• （1）Position independent,
• （2）Low opening pressure- immediate free flow,
• （3）Non-tortuous flow path,
• （4）High flow rate vs. package size,
• （5）Virtually no internal volume and dead space,
• （6）Particle compliant,
• （7）Corrosion resistant,
• （8）Wear resistant and
• （9）last but not least very cost effective.