AWWA C509-23 Resilient-Seated Gate Valves for Water Supply Service (PDF)

This standard describes iron-body resilient-seated gate valves with non-rising stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping gate valves, for water supply service having a temperature range of 33�F--125�F (0.6�C--52�C). 1.1.1 Velocity. These valves are intended for applications where fluid velocity does not exceed 16 ft/s (4.9 m/s) when the valve is in the full-open position. 1.1.2 Sizes. Gate valves described by this standard are 3--72 in. (75--1,800 mm) nominal pipe size (NPS). 1.1.3 Valve pressure rating. The minimum design working water pressure shall be 200 psi (1,380 kPa [gauge]) for 3--12 in. (75--300 mm) sizes and 150 psi (1,034 kPa [gauge]) for 14--72 in. (350--1,800 mm) sizes. 1.1.4 Conditions and materials not covered. This standard is not intended to describe special conditions of gate valve installation or operation, such as built-in power drive, installation in unusually corrosive soil, conveyance of unusually corrosive water, excessive water hammer, frequent operation (as in filter service), or operation in a throttled position. These conditions are beyond the intended scope of this standard and require special consideration in design and construction.