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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are a very reliable and a good, affordable replacement for flap-gate valves as well as other check valves. Be simple one-piece design and reinforced rubber construction eliminate the mechanical and metal components that rust and seize in conventional flap-gates. These are customized, a proven way , non-return check valves, made out of 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 has returned flow prevention and downstream of your pump, at pump stations.
 
The Rhinoflex Duckbill Check valves are passive-reactive devices requiring no external mechanisms or power source to work. The Duckbill Check Valve is commonly closed and definitely will react and open with as little as One inch of head pressure and constantly provide maximum flow with minimal pressure drop across the valve. This simplicity of 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 which enable it to even seal around trapped solids with less than 1 psi of back pressure.
 
Ideally, the conical concentric design allows for the very best flow hydraulics, and lowest pressure drops. It may handle well water volumes and weights preventing backflow very reliably and consistently, with no maintenance whatsoever.
Typical applications are for Open Relieve flood control, water-waste water, storm water, flood water, in to a manhole, bubble-pit, pond, lake, dam, or sea.
They may also be utilized in the back flow prevention of Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are successfully used in sub-sea applications including outfall diffuser systems, and in AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.