(a) General. Valves shall meet the following requirements:
(1) Twelve-inch and smaller valves shall be suitable for a working pressure of not less than 200 psi, and a minimum of 150 psi for valves greater than 12-inch.
(2) Open by counterclockwise rotation (open left).
(3) Provide an interior protective epoxy coating in accordance with AWW A C550 on ferrous surfaces in contact with the liquid.
(4) Components in contact with the liquid shall be in compliance with NSF 61.
(5) Equip valves with a suitable means of operation to be approved by the city.
(6) Ends shall be mechanical joint for underground location and flanged joint for above ground location/underground utility vaults.
(7) For buried valves over five feet deep, provide extension stems of cold rolled steel to bring the operating nut to within two feet of the ground surface. Extension stems shall also be provided as required for floor stands and to floor valve box.
(8) Provide valve accessories as required for proper valve operation for valve locations as recommended by valve manufacturer.
(9) Similar valve types shall be of one manufacturer.
(b) Gate valves, resilient-seated. Gate valves three-inch to 20-inch shall conform to AWW A C509 or AWW A C515 and to the following requirements:
(1) O-ring stem seal on non-rising (NRS) stem valves.
(2) Ends shall be mechanical joint for underground locations and flanged joint for above ground locations.
(3) Valves shall be non-rising stem (NRS) with wrench nut for underground locations and outside screw and yoke (os&y) with handwheel for above ground locations.
(4) Valves 16-inch and larger shall be equipped with gearing to facilitate opening. Geared valves shall be equipped with indicators to show the position of the gate in relation to the water.
(5) Valves 16-inch and larger shall be equipped with a by-pass if system pressures are high enough to warrant. Manufacturer's recommendations will be used to determine this.
(c) Tapping valves. Tapping valves shall conform to the specifications for the gate valves as indicated in this section and the following:
(1) Valve shall be specifically modified for the passage and clearance of the tapping machine cutter.
(2) The mating end to the tapping sleeve shall be raised male surface to provide true alignment to the sleeve and tapping machine. The valve shall be compatible with the tapping sleeve.
(d) Butterfly valves. Butterfly valves may be allowed by the city for installations greater than 16-inch. Butterfly valves shall conform to AWWA C504 for potable water and to the following requirements:
(1) Valve body shall be ductile iron and mechanical joint for below ground locations and flanged short body or long body in underground vaults and above ground locations. End mechanical joints shall conform to ANSI/AWWA C110/A21.10 and ANSI/AWWA C111/A21.11. End flanges shall conform to ANSI B16.1, Class 125 and ANSI/AWWA C110/21.10.
(2) Valves shall be AWWA Class 150B.
(3) Rubber seats shall mate with stainless steel or nickel-copper alloy seat surfaces.
(4) Valve shafts shall be one piece or the stub-shaft type. Shafts shall be type 304 stainless steel.
(5) Valve discs shall be cast iron, ductile iron, or stainless steel.
(6) Valve actuator.
a. Manual actuator. Manual actuator shall be of the traveling nut type. Valves for buried service shall have a standard AWWA nut. Valves for above ground shall have a handwheel, or chain wheel as indicated on the drawings. Actuators shall be open-left (counterclockwise) only.
(e) Swing-check valves. Swing-check valves two to 24-inch shall conform to AWWA C508 and to the following requirements:
(1) Provide lever and weight for swing check control.
(2) Metal to metal seat construction.
(3) Ends shall be flanged.
(Ord. of 11-7-16; No. 10-16)