This standard describes iron-body resilient-seated gate valves with nonrising stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping gate valves, for water supply service having a temperature range of 33–125°F (0.6–52°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 psig (1,380 kPa [gauge]) for 3–12 in. (75–300 mm) sizes and 150 psig (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.

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