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DocuSign Envelope ID:81 E05E8E-EED7-43D3-8B8A-0811 OE72140A <br /> SECTION 33 34 00 - FORCE MAINS <br /> valve position and an adjustable stop shall be provided to set closing torque. Valve <br /> packing adjustment shall be accessible without disassembly of the actuator. Valves for <br /> non-buried services shall be furnished with a handwheel, except valves mounted <br /> inaccessibly high shall be provided with chain operators. Plug valves for buried service <br /> shall have gear operators and shall be provided with nut operator and extension stem of <br /> suitable length. <br /> C. Valves and actuators shall be as manufactured by Dezurik, Keystone, Kennedy, or equal. <br /> 2.12 CHECK VALVES <br /> Standard check valves shall be iron body, bronze, mounted, full opening external lever weight <br /> loaded, 125 lb. ANSI Standard flanged, and suitable for at least 150 psi pressure. Check valves <br /> shall have two '/2' threaded taps on the side upstream and downstream from the clapper. A '/2" <br /> galvanized nipple and '/2' bronze gate valve shall be installed in each tap. <br /> 2.13 CUSHION CHECK VALVE <br /> Cushion check valves shall be controlled closing swing check valves. Valve body, cover, and <br /> lever shall be heavy duty cast iron, ASTM A126-B. Disc arm shall be cast steel keyed to the <br /> hinge shaft. Hinge shaft shall be 18-8 stainless steel, sized to withstand a complete hydraulic <br /> unbalanced pressure of 125 psi on the valve disc. A single oil-filled cushioning device shall be <br /> allowed for field adjustment of the valve closing speed at the final portion of the disc travel. Valve <br /> shall have ANSI 125 pound flanged connections. Valves shall be rated for 150 psi working <br /> pressure and 100 psi surge pressure. <br /> 2.14 BALL CHECK VALVES <br /> Ball check valves shall be high density PVC with threaded connections or ductile iron body with <br /> flanged connection rated 125 psi and 150°F as required. Ball shall be hollow steel and coated to <br /> prevent wear and deterioration. Valve shall be suitable for mounting in either horizontal or <br /> vertical direction. <br /> 2.15 VALVE BOXES <br /> Valve boxes shall be of cast iron, three-piece, screw type with covers and bases. They shall be <br /> of suitable size for the valve with which they are used and fully adjustable for depth of setting, <br /> extension pieces being furnished where necessary. Drop type covers shall be provided for each <br /> box with the proper work designating the valve service cast into its top surface. Oval type bases <br /> shall be provided and shall be so designed to fully support the box without weight of the box <br /> and/or superimposed load being transmitted to any part of the valve or adjacent pipe on either <br /> side. <br /> 2.16 CONCRETE <br /> Concrete for protection and a thrust blocks shall be composed of Portland Cement, sand, coarse <br /> aggregate, water and such admixtures as may be allowed, in such proportions as to provide in <br /> minimum compressive strength of 3,000 psi. The source of concrete and mix design shall be <br /> approved by the Engineer to use. <br /> 2.17 CRUSHED STONE <br /> Crushed stone for pipe bedding shall conform to ASTM C33, size no. 67 with a range of/4'to 1. <br /> 2.18 DETECTABLE TAPE <br /> Orange County DAA PN R00592-225N2 <br /> Walnut Grove Wastewater System January, 2021 <br /> 33 34 00-6 <br />