02480.30 1105 Section 02480 - Potable Water Valve Materials Description
02480.00 Scope - This Section includes the requirements for gate valves, butterfly valves, valve
boxes, valve stem extensions, tapping sleeve and valve assemblies, check valves, combination air release/air vacuum valves, and backflow prevention devices for potable water systems. Materials
02480.10 General - Provide valves with operating nuts or hand wheels as specified or shown.
Furnish a standard 2 inch operating nut. All M aterials in contact with pot able water shall conform to ANSI/NSF Standard 61, Drinking Water System Components - Health Effects, or equivalent. When indicated, coat all interior and exterior ferrous surfaces of valves with a protective epoxy coating meeting the requirements of AWWA C550.
02480.20 Gate Valves:
a.Minimum Pressure - Provide gate valves that meet the requirements of AWWA C500, AWWA C509, or AWWA C515. The minimum design working pressure shall be 200 psi for pipe 2 inches to 12 inches in diameter, and 150 psi for pipe 14 inches to 16 inches in diameter.
b.Arrangement - For 16 inch diameter pipe, arrange gate valves for operation with gear case in the horizontal position. Equip valves with bypasses and gate valves of the sizes adopted in the AWWA Standards. Eq uip bypass gate valves with standard 2 inch operating nuts.
c.Valves - Provide gate valves that are resilient seat, non-rising stem type, open counterclockwise, and are equipped with an O -ring stuffing box.
02480.22 Butterfly Valves:
a.Seats and Seals - Provide b utterfly valves that are rubber seated and meet the requirements of AWWA C504, Class 150B. Shaft seals shall be standard O -ring seals, designed for replacement under line pressure.
b.Valve Operators - Provide v alve oper ators of the traveling nut or worm gear type and that are sealed, gasketed, and permanently lubricated for buried service. Construct valve operators to the standard of the valve manufacturer to withstand all anticipated operating torques, and design to resist submergence in groundwater.
c.Valves - Provide butterfly valves th at are resilient seat, open counterclockwise, and are equipped with an O ring stuffing box.
02480.25 Valve Boxes - Install valve boxes on all buried valves. Boxes shall be of cast iron,
two-piece, slip type standard design, with a base corresponding to the size of the valve. The cover shall have the word "WATER" cast in it.
02480.26 Valve Stem Extensions - Valve stem extensions shall have a 2 inch square operating nut
and self -centering rockplate support. Valves with an operating nut more than 3 feet below grade shall have a valve stem extension to raise the operating nut to within 3 feet of the ground surface.
02480.30 Tapping Sleeve and Valve Assemblies:
a.Valve Assemblies - Furnish tapping valves with flanged inlet end connections. The outlet ends shall conform in dimensions to the AWWA Standards for mechanical joint connections or 02480.40 1106 flange connections , except that the outside of the end connection shall have a large flange for attaching a drilling machine. The seat opening of the valve shall permit a diameter cut no less than 1/2 inch smaller than the valve size. Valves specifically designed for tapping meeting the requirements of AWWA C500, and valves meeting the requirements of AWWA C509, will be allowed. Tapping valves shall be of the same type as other valves on the Project.
b.Sleeves - Tapping sleeves shall be cast iron, ductile iron, stainless steel, epoxy coated steel or other approved Material .
02480.40 Check Valves - Check valves shall conform to the following:
a.Swing Check Valve - Swing check valves shall meet the requirements of AWWA C508, with rubber seat materials mating with metal seating surfaces. The minimum design working pressure shall be 175 psi for check valves with diameters of 12 inches and smaller, and 150 psi for check valves with diameters of 14 inches and 16 inches. Check valves shall be non-assisted, unless otherwise indicated.
b.Spring -Loaded Plug or Disc Check Valves - Spring -loaded plug or disc check valves shall be bronze mounted with bronze, cast or ductile iron body, bronze plug or disc, stainless steel spring, and resilient seating suitable for potable water service. The valves shall provide drop-tight sealing. The plugs or discs shall be easily replaceable. The minimum design working pressure of the valves shall be 150 psi.
02480.60 Combination Air Release/Air Vacuum Valves - Furnish c ombination air release/air
vacuum valves that meet the requirements of AWWA C512. The valve body shall have a minimum design working pressure of 300 psi. The body and cover shall be cast iron conforming to ASTM A48, Class 30. Floats shall be stainless steel conforming to ASTM A240 and designed to withstand 1,000 psi. Seats shall be Buna -N rubber. Internal parts shall be stainless steel or bronze.
02480.70 Backflow Prevention Devices - Backflow prevention devices shall be capable of
withstanding a minimum design working pressure of 150 psi, and shall conform to the following:
a.Reduced Pressure Backflow Prevention Assembly - Reduced pressure backflow prevention assemblies shall consist of a mechanical, independently operating, hydraulically dependent relief valve located between two independently operating, spring loaded check v alves that are located between two tightly closing resilient seated shutoff valves, with four resilient seated test cocks, all meeting the requirements of AWWA C511 and the Oregon State Health Division.
b.Double Detector Check Valve Backflow Prevention Assembly - Double detector check valve backflow prevention assemblies shall consist of two spring loaded, independently operating check valves, located between two tightly closing resilient seated shutoff valves, with four resilient seated test cocks, all meeting the requirements of AWWA C510 and the Oregon State Health Division.
02480.80 Acceptance - Valves and appurtenances will be accepted according to 00165.35 and this
Section.
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 1171–1172 of 1,268. View official source ↗