Tideflex - Model Duckbill CIL - Series 37 -In-Line Flanged Check Valve

The CIL - Series 37 In-Line Flanged 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. Because most of the valve is inserted into the downstream pipe, the face-to-face dimension of the Series 37 is just the flange thickness, making it ideal for applications with space limitations. In order to fit inside the pipe, the bill cannot flare and therefore the head loss of the Series 37 is higher than other styles of Tideflex^® Check Valves. The Series 37 is 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.