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1 r2 . 2.6 . Gate Valves & Valve Boxes Description Gate valves and valve boxes shall include the furnishing and installation of gate valves with 1 2,500 psi concrete foundations and valve boxes in the water main distribution system, in accordance with these specifications and in reasonably close conformity to the locations shown on the plans or as directed by the Engineer. Materials Gate valves shall be resilient seated with restrained mechanical joint, manufactured to meet or exceed the requirements of AWWA C509 and in accordance with the following specifications : Valves shall have an unobstructed waterway equal to or greater than the full nominal diameter of the valve. Valves shall have a minimum rated working pressure of 150 psi, and a minimum rated test pressure of 300 psi. The valves are to be non-rising stem with the stem made of cast, forged, or rolled bronze shown in AWWA C509 . Two stern seals shall be provided and shall be of the O-ring type, one above and one below the thrust collar. Bonnet face of the stuffing box shall be smooth and machine finished. ' The stem nut shall be (2 ") square, made of bronze, and may be independent of the gate or the integral type design. The seal mechanism shall consist of a cast iron gate having a vulcanized synthetic rubber coating or be mechanically retained on the disc. The resilient sealing mechanism shall provide zero leakage at the water working pressure when installed with the line flow in either direction. The valve body, bonnet, and bonnet cover shall be cast iron ASTM A126, Class B . All ferrous ' surface inside and outside shall have a fusion-bonded or spray epoxy coating. A handwheel or wrench shall be provided for operating the valve. All valves shall open in a counter-clockwise motion. All valves are to be tested in strict accordance with AWWA C509. Gate valves shall be similar to American-Darling "CRS40, " Mueller Resilient Seat Gate Valve or an approved equal . All valves shall have a valve box installed to the ground surface. The box shall be a two piece for valves 2 " through 12 " , and three piece for valves 14" and larger. The box shall be a screw type with 5 1 /4" shaft. The lid shall be marked " Water" and must be painted blue. A pad 36 " x 36 " concrete pad must be poured around the top of the box to prevent damage or movement. The box shall have extensions as required. Boxes shall be as manufactured by Mueller Company or approved equal. 18