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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an exceedingly reliable and a very good, affordable alternative to flap-gate valves and also other check valves. The easy one-piece design and reinforced rubber construction remove the mechanical and metal components that rust and seize in conventional flap-gates. They are custom made, one of the ways , non-return check valves, made out of a number of elastomeric rubbers, and built as reported by the application as well as the line pressure and back pressure concerned. They are available in all standard pipe sizes, and typical application is back flow prevention and downstream of a 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 commonly closed and can react and open with less than 1 " of head pressure and always provide maximum flow with minimal pressure drop throughout the valve. This easy 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 which enable it to even seal around trapped solids with less than 1 psi of back pressure.
 
Ideally, the conical concentric design enables the most effective flow hydraulics, and lowest pressure drops. It may handle well water volumes and weights preventing backflow very reliably and consistently, without having maintenance at all.
Typical applications are for Open Launch of flood control, water-waste water, storm water, flood water, into a manhole, bubble-pit, pond, lake, dam, or sea.
They can also provide from the back flow protection against Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are successfully used in sub-sea applications like outfall diffuser systems, along with AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.