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  <br />CITY OF SUNNY ISLES BEACH SECTION 02100 - 2 <br />OUTFALL VALVES <br />  <br /> <br />E. Manufacturer to have conducted Finite Element Analysis (FEA) on various duckbill valves <br />to determine deflection, stress and strain characteristics under various load conditions. <br />Modeling must have been done for flowing conditions (positive differential pressure) and <br />reverse differential pressure. <br /> <br />F. The bill slit of the duckbill valve must be at least 1.57 times the nominal pipe diameter. <br /> <br />PART 2 - PRODUCTS <br /> <br />2.1 CHECK VALVES <br /> <br />A. Check Valves are to be all rubber of the flow operated check type with a slip-on <br />connection. The Check Valve is designed to slip over the specified pipe outside diameter <br />and attached by means of vendor furnished stainless steel clamps. The port area shall <br />contour down to a duckbill, which shall allow passage of flow in one direction while <br />preventing reverse flow. The valve shall be one-piece rubber construction with nylon <br />reinforcement. The bill portion shall be thinner and more flexible than the valve body and <br />formed into a curve of 180°. <br /> <br />B. Company name, plant location, valve size and serial number shall be bonded to the check <br />valve. A single manufacturer shall provide all elastomer duckbill check valves. <br /> <br />2.2 FUNCTION <br /> <br />A. When line pressure inside the valve exceeds the backpressure outside the valve, the line <br />pressure forces the bill of the valve open, allowing flow to pass. When backpressure <br />exceeds the line pressure, the bill of the valve is forced closed. <br /> <br />2.3 MANUFACTURER <br /> <br />A. All valves shall be of Checkmate Inline as manufactured by Tideflex Technologies, <br />Carnegie, PA 15106, or Equal. All valves shall be manufactured in the U.S.A. <br /> <br />