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The Tideflex Series 37 In-Line Duckbill Check Valve is a simple, reliable, cost-effective solution for backflow prevention. The revolutionary design of the 37 is similar to the Series 35, but the Series 37 “bill” does not flare and is designed to be inserted into the downstream pipe and fastened between two mating flanges, eliminating the need for a valve body. Since most of the valve is inserted into the downstream pipe the face-to-face dimension of the 37 is just the flange thickness making it ideal for applications with space limitations. In order to fit down inside the pipe, the bill cannot flare and therefore the headloss of the 37 is higher than other styles of Tideflex. The 37 in not only installed in piping systems but is used extensively in concrete manholes and structures where the valve is inserted into the effluent pipe and the flange is anchored to the concrete wall with a retaining ring.
The 37 flange size drilling conforms to ANSI Class 125/150# and is also available with DIN drillings and other standard or customized drilling patterns. The Series 37 Duckbill Check Valves are not supplied with retaining rings, as they are typically installed between pipe flanges, but retaining rings can be supplied for applications that require it.
The Tideflex Duckbill Check Valve is a revolutionary design for backflow prevention. Tideflex Valves are a one-piece rubber matrix of numerous natural and synthetic elastomers and ply reinforcement, similar in construction to a truck tire. Tideflex are cost-effective because they do not need periodic maintenance or repair to keep them operational and they have a 30 year operational life span. Tideflex operate using line pressure and backpressure to open and close so no outside energy source is required. The valve has an extremely low cracking pressure so the valve self-draining which eliminates standing water and maximizes storage volume in the upstream pipe. Tideflex Valves have low headloss, 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 Tideflex allows the valve to compress around trapped solids providing a much better seal than flap gates, as confirmed by the USEPA. 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.
For higher backpressure ratings or to lower headloss while maintaining backpressure ratings, the Saddle Support Technology (SST) can be used in conjunction with the Series 37.
Valve Type: Valves & Accessories
Sub-Type: Tideflex Check Valves
- Reliable backflow prevention
- Installed between mating flanges, short face-to-face
- 100% elastomer construction eliminates maintenance
- Will not corrode, warp or freeze open or shut
- 1”-2” Cracking Pressure
- Custom built for each application based on pressure and flow conditions
- Available in diameters from 1/2" (12mm) to 72” (1800mm)