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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an extremely reliable and a good, affordable alternative to flap-gate valves as well as other check valves. The simple one-piece design and reinforced rubber construction eliminate the mechanical and metal components that rust and seize in conventional flap-gates. They're custom made, one of many ways , non-return check valves, produced from various elastomeric rubbers, and built as per the application and also the line pressure and back pressure concerned. These come in all standard pipe sizes, and typical application is back flow prevention and downstream of an pump, at pump stations.
 
The Rhinoflex Duckbill Check valves are passive-reactive devices requiring no external mechanisms or source of energy to work. The Duckbill Check Valve is commonly closed and definitely will react and open with less than 1 " of head pressure and try to provide maximum flow with minimal pressure drop throughout the valve. This simplicity of operation reduces standing water in sewer pipes where mosquitoes along with other pests can thrive.

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Their all-flexible construction will pass large objects without blockage yet offers exceptional back flow prevention and will even seal around trapped solids with as low as 1 psi of back pressure.
 
Ideally, the conical concentric design allows for the best flow hydraulics, and lowest pressure drops. These can handle very well water volumes and weights preventing backflow very reliably and consistently, without any maintenance at all.
Typical applications are for Open Discharge of flood control, water-waste water, storm water, flood water, into a manhole, bubble-pit, pond, lake, dam, or sea.
They can also provide in the back flow prevention of Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are proven to work in sub-sea applications such as outfall diffuser systems, and in AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.