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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an exceptionally reliable and a good, economical alternative to flap-gate valves and other check valves. Be simple one-piece design and reinforced rubber construction remove the mechanical and metal components that rust and seize in conventional flap-gates. These are generally made to order, one of the ways , non-return check valves, created from many different elastomeric rubbers, and built as reported by the application and the line pressure and back pressure concerned. They come in all standard pipe sizes, and typical application is back flow prevention and downstream of the pump, at pump stations.
 
The Rhinoflex Duckbill Check valves are passive-reactive devices requiring no external mechanisms or power supply to function. The Duckbill Check Valve is generally closed and definitely will react and open with as few as 1 " of head pressure and try to provide maximum flow with minimal pressure drop through the valve. This simple operation reduces standing water in sewer pipes where mosquitoes and 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 few as 1 psi of back pressure.
 
Ideally, the conical concentric design enables the very best flow hydraulics, and lowest pressure drops. These may handle very well water volumes and weights which will help prevent backflow very reliably and consistently, without any maintenance whatsoever.
Typical applications are for Open Relieve flood control, water-waste water, storm water, flood water, into a manhole, bubble-pit, pond, lake, dam, or sea.
They can also be utilized inside the back flow prevention of Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are proven to work in sub-sea applications including outfall diffuser systems, plus AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.