The duckbill check valve is a revolutionary design for backflow prevention. Duckbill check valve is a one-piece rubber matrix of numerous natural and synthetic elastomers and ply reinforcement, similar in construction to a truck tire. FLOWSPEC duckbill check valve is cost-effective because they do not need periodic maintenance or repair to keep them operational and they have a long operational life span. Duckbill check valve operates using line pressure and backpressure to open and close so no outside energy source is required. Duckbill check valve has an extremely low cracking pressure so the valve self-draining which eliminates standing water and maximizes storage volume in the upstream pipe. FLOWSPEC duckbill check valve has low head loss; they do not rust or corrode and are not affected by UV, so performance and reliability is constant thru the life of the valve. The flexibility of the duckbill check valve allows the valve to compress around trapped solids providing a much better seal than flap gates. With the development of the patented curved bill, sealing capabilities are even further improved because the curve bill is more flexible than the rest of the valve and therefore compress more around solids.
The XF-TF duckbill check valve installs by slipping over the end of an exposed piece of pipe, and is fastened with compression clamps. The inside diameter of the valve cuff is fabricated to exactly match the outside diameter of the pipe.
The XF-FL duckbill check valve is manufactured similarly to the XF-TF duckbill check valve, with the addition of an integral elastomeric flange. The XF-FL duckbill check valve can be mounted to mating flanges or wall thimbles or directly to concrete walls.
The XF-FL duckbill check valve flange size drilling conforms to ANSI Class 125/150# and is also available with DIN drillings and other standard or customized drilling patterns. All XF-FL duckbill check valves are furnished complete with retaining rings for installation.