MeasurIT Specification Series S35-1

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3. 2.03 MANUFACTURER A. All valves shall be of the Series 35-1 as manufactured by Tideflex Technologies, Carnegie, PA 15106. All valves shall be manufactured in the U.S.A. PART 3: EXECUTION 3.1 INSTALLATION A. Contractor shall confirm the size and type of the proposed check valve on site prior to order. B. Valve shall be installed in accordance with manufacturer’s written Installation and Operation Manual and approved submittals. 3.2 MANUFACTURER’S CUSTOMER SERVICE A. Manufacturer’s authorized representative shall be available for customer service during installation and start-up, and to train personnel in the operation, maintenance and troubleshooting of the valve. B. Manufacturer shall also make customer service available directly from the factory in addition to authorized representatives for assistance during installation and start-up, and to train personnel in the operation, maintenance and troubleshooting of the valve.

2. PART 2: PRODUCTS 2.01 “DUCKBILL” ELASTOMERIC CHECK VALVES A. Check Valves are to be all rubber and the flow operated check type with an integral flanged end connection. The port area shall contour down to a duckbill which shall allow passage of flow in one direction while preventing reverse flow. The flange and flexible duckbill sleeve shall be one-piece rubber construction with nylon reinforcement. The duckbill shall be offset so that the bottom line of the valve is flat, keeping the invert of the pipe parallel with the invert of the valve. The top of the valve shall rise to form the duckbill shape. The bill slit of the duckbill valve must be at least 1.57 times the nominal pipe diameter. In sizes 20”/500mm and larger, the bill portion shall be thinner and more flexible than the valve body and formed into a curve of 180°. B. Where a saddle support is identified as being necessary, the valve must incorporate a metallic support completely encapsulated in the wall thickness at the top portion of the valve to assist in supporting the weight of the valve and withstanding extraordinary pressure from wave action and/ or stone loading. C. The flange drilling shall conform to PN16 or other specified pattern as described in BS EN 1092-2:1997. The valve shall be furnished with galvanized or stainless steel backing/retaining rings for installation. D. Manufacturer must have available flow test data from an accredited hydraulics laboratory to confirm pressure drop data. Company name, plant location, valve size and serial number shall be bonded to the check valve. 2.02 FUNCTION A. When line pressure inside the valve exceeds the back pressure outside the valve, the line pressure forces the bill of the valve open, allowing flow to pass. When back pressure exceeds the line pressure, the bill of the valve is forced closed preventing backflow. B. The valve must be capable of withstanding a minimum of 7.2m back pressure or that specified in the design by The Engineer, whichever is the greater. C. The valve must be capable of passing the flow rates with headlosses specified in the design by The Engineer.

1. SPECIFICATION: TIDEFLEX SERIES 35-1 FLANGED FLAT BOTTOMED CHECK VALVES PART 1: GENERAL 1.1 SUBMITTALS A. Upon request, Supplier shall submit product literature that includes information on the performance and operation of the valve, materials of construction, dimensions and weights, elastomer characteristics, headloss and flow data, and pressure ratings. B. Upon request, Supplier shall provide shop drawings that clearly identify the valve dimensions. C. Upon request, Supplier shall provide installation and reference lists for existing valves of similar size and type to the project scope. 1.2 QUALITY ASSURANCE A. Manufacturer shall have at least fifteen (15) years experience in the manufacture of “duckbill” style elastomeric valves. B. Manufacturer shall have conducted independent hydraulic testing to determine headloss and jet velocity characteristics on a minimum of eight sizes of duckbill valves ranging from 2” through 48”. The testing must include multiple constructions (stiffness) within each size and must have been conducted for free discharge (discharge to atmosphere) and submerged conditions. C. Manufacturer shall have conducted an independent hydraulic test where multiple valves (at least four) of the same size and construction (stiffness) were tested to validate the submitted headloss characteristics and to prove the repeatability of the manufacturing process to produce the same hydraulic characteristics. D. Manufacturer to have conducted Finite Element Analysis (FEA) on various duckbill valves to determine deflection, stress and strain characteristics under various load conditions. Modelling must have been done for flowing conditions (positive differential pressure) and reverse differential pressure. E. Check valves are to comply with WIMES 8.09 valve specification. F. Check valves to have 25+ years design life and 1 year manufacturer’s warranty.


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