This standard covers iron-body, resilient-seated gate valves, including tapping
gate valves, with non-rising stems (NRS) and outside-screw-and-yoke (OS&Y) rising
stems for water supply service. 1.1.1 Sizes. Gate valves covered by this standard
are 3 in. (75 mm), 4 in. (100 mm), 6 in. (150 mm), 8...
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C509-94: AWWA Standard for Resilient-Seated Gate Valves for Water Supply Service
This standard covers iron-body, resilient-seated gate valves, including tapping
gate valves, with non-rising stems (NRS) and outside-screw-and-yoke (OS&Y) rising
stems for water supply service. 1.1.1 Sizes. Gate valves covered by this standard
are 3 in. (75 mm), 4 in. (100 mm), 6 in. (150 mm), 8 in. (200 mm), 10 in. (250
mm), 12 in. (300 mm), 16 in. (400 mm), and 20 in. (500 mm) nominal pipe size
(NPS). Sizes refer to the nominal diameter, in inches (or millimeters), of the
waterway through the inlet and outlet connections and the closure area. 1.1.2
Valve pressure rating. The minimum design working water pressure shall be 200
psig (1,380 kPa [gauge]) for 3- through 12-in. (75- through 300-mm) size and 150
psig (1,034 kPa [gauge]) for 16- and 20-in. (400- and 500-mm) sizes. 1.1.3
Conditions and materials not covered. This standard is not intended to cover
special conditions of installation or operation, such as built-in power drive,
installation in vertical or steeply inclined lines, conveyance of unusually
corrosive water, or excessive water hammer. Such conditions are beyond the
intended scope of this standard and require special consideration in design and
construction. Joint accessories for end connections, such as bolts, gaskets,
glands, follower rings, and so forth, are not covered in this standard. The major
revisions in this edition of AWWA C509-94 include the following: numerous
modifications to conform to current AWWA form and content have been added; the
"Modification to Standard" and "Acceptance" sections have been added to the
foreword; asbestos packing and gasket materials are no longer referenced in the
standard; information on tapping valves has been added; soft metric equivalents
have been added; definitions have been modified; The Safe Drinking Water Act 1986
Amendments reference to maximum lead content in bronze has been added; repairs to
castings of valve components have been clarified (Sec. 5.1.2.); and, discussion of
16-in. (400-mm) and 20-in. (500-mm) valves has been added to the scope of this
standard (Sec. 1.1.1).