(a) General.
(1) Valves used in sewer applications shall meet the following requirements:
a. Open by counterclockwise rotation (Open-Left).
b. Shall be suitable for a working pressure of 150 pressure psi.
c. Equip valves with a suitable means of operation.
d. 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.
e. Provide valve accessories as required for proper valve operation as recommended by valve manufacturer. Valve accessories shall be compatible to proper valve operation.
f. Similar valve types shall be of one manufacturer.
g. All valves shall be warranted for ten years from date of installation against defective materials and workmanship.
h. Valves shall be manufactured by American Flow Control, Clow Valve Company, Kennedy Valve Company, M&H Valve Company, Mueller Company or U.S. Pipe and Foundry Company.
(b) Gate valves, resilient-seated.
(1) Gate valves three-inch to 20-inch shall conform to NNWA C509 or C515 and to the following requirements:
a. O-ring stem seal on non-rising (NRS) stem valves.
b. Ends shall be mechanical joint for underground locations and flanged joint for above ground locations.
c. 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.
(c) Plug valves.
(1) Plug valves shall conform to the following requirements:
a. Plug valves shall be of the non-lubricated, eccentric type designed for a working pressure of 175 psi for valves 12 inches and smaller, 150 psi for valves 14 inches and larger.
b. Valves shall provide tight shut-off at rated pressure.
c. The plug valve body shall be cast iron ASTM A126 Class B with a welded-in overlay of not less than 90% nickel alloy content on all the surfaces contacting the face of the plug.
d. The valve plug shall be constructed of cast iron conforming to ASTM A126 Class B, with Buna N resilient seating surface to mate with the body seat.
e. Valve flanges shall be in accordance with ANSI B16.1 Class 125.
f. Shaft bearings shall be sleeve-type, sintered, oil impregnated, and permanently lubricated stainless steel.
g. Plug valve shaft seals shall be of the multiple V-ring type and shall be adjustable. Sealing system shall conform to AWWA C504 and C507 standards. All packing shall be replaceable without removing the bonnet or actuator and while valve is in service.
h. Valves six inches and larger shall be provided with gear actuators.
i. Provide levers or hand wheels to operate the valve as recommended by the manufacturer.
j. Full ported (i.e,. 100% flow area) and piggable.
(d) Swing check valves.
(1) Swing check valves shall conform to AWWA C508 and to the following requirements:
a. Provide lever and weight for swing check control. Cushioned checks shall be provided where deemed necessary by the city.
b. Resilient material to metal seat construction.
c. Ends shall be flanged.
d. All interior iron surfaces shall be coated with a minimum of a eight mils of fusion bonded epoxy or liquid epoxy in accordance with ANSI/AWWA C550.
(e) Air valves.
(1) Air valves shall be in conformance with AWWA C512 and the following:
a. Valve type shall be a combination valve.
b. Orifices shall be sized based on system conditions and manufacturer's recommendation.
c. Valve shall be designed for the following automatic operation:
1. Release of large quantities of air during the filling of the main.
2. Permit air to enter the main when it is being emptied.
3. Release accumulated air while the main is in operation and under pressure.
(2) Valve shall be designed for a system pressure of 150 psi. Valve shall also operate at a minimum system pressure of 20 psi.
(3) Provide threaded inlet.
(4) Provide stainless steel ball float and wetted internal parts.
(5) Provide isolating bronze ball valve for connection to main line.
(6) For sewage force mains provide tall body to minimize possibility of sewage plugging orifice or linkage.
(7) Sewage force main valve shall include backwash accessories. They shall include bronze flushing ball valves and five feet of rubber hose with quick-connect coupling on each end.
(f) Valve box.
(1) Valve boxes shall be high strength cast iron of the telescopic type. Box shall consist of a base section, center extension as required, and a top section with cover marked “SEWER.”
(Ord. of 11-7-16, No. 10-16)