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Liquid flow air control non return Silicone One way check valve
One-way valve components are used to create a unidirectional flow in a device. They are in fact elastomeric sealing elements that allow forward flow and prevent backflow. There are different designs. If you like low opening pressure and ease of assembly then the first choice would be a duckbill valve. If you need a certain cracking pressure or a low-pressure drop at higher flows then an umbrella valve would be our recommendation.
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Medical grade Non return Silicone rubber duckbill check valve for manual resuscitator
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.
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