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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an exceptionally reliable and a very good, economical alternative to flap-gate valves and other check valves. Be simple one-piece design and reinforced rubber construction take away the mechanical and metal components that rust and seize in conventional flap-gates. These are made to order, a proven way , non-return check valves, made out of a number of elastomeric rubbers, and built as per the application as well as the line pressure and back pressure concerned. These come in all standard pipe sizes, and typical application has returned flow prevention and downstream of the pump, at pump stations.
 
The Rhinoflex Duckbill Check valves are passive-reactive devices requiring no external mechanisms or automobiles to work. The Duckbill Check Valve is commonly closed but will react and open with as little as 1 inch of head pressure and try to provide maximum flow with minimal pressure drop through the valve. This simplicity of operation reduces standing water in sewer pipes where mosquitoes as well as 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 most effective flow hydraulics, and lowest pressure drops. It may handle well water volumes and weights preventing backflow very reliably and consistently, with no maintenance at all.
Typical applications are for Open Turmoil flood control, water-waste water, storm water, flood water, in a manhole, bubble-pit, pond, lake, dam, or sea.
They can also be utilized in the back flow prevention of Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are used successfully in sub-sea applications like outfall diffuser systems, plus AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.