This standard describes iron-body, metal-to-metal seated, nonrisingstem (NRS) gate valves, including tapping gate valves, 3 in. (75 mm) through 72 in. (1,800 mm), and outside screw and yoke (OS&Y) rising-stem gate valves, 3 in. (75 mm) through 72 in. (1,650 mm), with either double-disc gates having parallel or inclined seats, or solid-wedge gates.
These valves are suitable for use in approximately level settings within water systems. These valves are intended for applications where fluid velocities do not exceed 16 ft/sec (4.9 m/sec) when the valve is in the fully open position.
