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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an exceptionally reliable and an excellent, cost-effective substitute for flap-gate valves along with other check valves. The easy one-piece design and reinforced rubber construction eliminate the mechanical and metal components that rust and seize in conventional flap-gates. These are custom made, one way , non-return check valves, made out of a variety of elastomeric rubbers, and built as reported by the application along with the line pressure and back pressure concerned. They 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 use. The Duckbill Check Valve is normally closed and can react and open with as little as 1 " of head pressure and try to provide maximum flow with minimal pressure drop through the valve. This ease 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 which enable it to even seal around trapped solids with as little as 1 psi of back pressure.
 
Ideally, the conical concentric design allows for the most effective flow hydraulics, and lowest pressure drops. These may handle extremely well water volumes and weights preventing backflow very reliably and consistently, without any maintenance in any way.
Typical applications are for Open Turmoil flood control, water-waste water, storm water, flood water, into a manhole, bubble-pit, pond, lake, dam, or sea.
Like be utilized from the back flow prevention of Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are used with in sub-sea applications such as outfall diffuser systems, along with AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.