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The Rhinoflex duckbill


The Rhinoflex duckbill check valves are an exceptionally reliable and a good, economical option to flap-gate valves along with other check valves. The simple 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 of the ways , non-return check valves, created from a variety of 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 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 but will react and open with as few as 1 " of head pressure and constantly provide maximum flow with minimal pressure drop across the valve. This simple operation reduces standing water in sewer pipes where mosquitoes and also 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 can even seal around trapped solids with less than 1 psi of back pressure.
 
Ideally, the conical concentric design permits the best flow hydraulics, and lowest pressure drops. It may handle well water volumes and weights which will help prevent backflow very reliably and consistently, with no maintenance in any way.
Typical applications are suitable for Open Discharge of flood control, water-waste water, storm water, flood water, into a manhole, bubble-pit, pond, lake, dam, or sea.
Glowing provide inside the back flow protection against Effluent ,Sewage, and  Sewerage systems.
The duckbill check valves are used successfully in sub-sea applications for example outfall diffuser systems, along with AIR Aeration, in SPARGE diffusers in Effluent Mixing tanks and slurry mixing systems.