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PART 2: PRODUCTS ' <br /> 2.01 MATERIALS ' <br /> A. Gate Valves: All gate valves shall be designed for a minimum working <br /> pressure of 200 psi unless otherwise specified. Valves shall have a clear , <br /> waterway equal to the full nominal diameter of the pipe. Valves shall be <br /> opened by turning counterclockwise. Each valve shall have the initials or <br /> name of the maker, pressure rating and year of manufacture cast on the ' <br /> body. Prior to shipment from the factory, each valve shall be tested by <br /> hydraulic pressure equal to twice the specified working pressure. Valves <br /> shall be operated by handwheel for above ground installations or 2" square ' <br /> operating nut for below ground installations. Valves shall have an arrow <br /> cast in the metal indicating the direction of opening. <br /> Valves to be installed Buried underground shall be of the non-rising stem , <br /> 9 (Buried) <br /> type and shall have mechanical joint connections. <br /> Valves installed above ground or in structures shall have rising stems with ' <br /> outside stem and yoke and 18" diameter minimum hand wheel and shall <br /> have flanged ends with 125#flanges unless others noted. ' <br /> 1. Gate Valves 2" and Smaller: ' <br /> a. Gates valves 2" and smaller shall be all brass, single disc <br /> type, double seat tapered wedge type built to manufacturer's ' <br /> standards with material and construction conforming to <br /> AWWA C-500. <br /> b. Each valve shall have a 2" operating nut. Valves shall have ' <br /> screwed ends conforming to NPT standards. <br /> 2. Resilient Seated Wedge Valve: ' <br /> a. Gate valves 3" through 24" diameter size shall be of cast iron <br /> or ductile iron body, resilient seated wedge type meeting the <br /> requirements set forth in AWWA C-509 and AWWA C-500. <br /> All valves shall be from one manufacturer and parts , <br /> interchangeable. <br /> b. Gate valves shall have body, bonnet and gate manufactured ' <br /> of cast iron or ductile iron conforming to ASTM A-536. The <br /> shell thickness of all components shall conform to the <br /> thicknesses in Table 2, Section 4.4 of AWWA C-509 and C- ' <br /> 500. The valve body and bonnet shall be coated on both the <br /> Rev. 10/22/01 PROJECT#13.01126 02640-Page 2 ' <br />