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.
This standard can be referenced in purchasing and receiving documents for metal-seated gate valves and can be used as a guide for testing the physical and chemical properties of metal-seated gate valves. The stipulations of this standard apply when this document has been referenced and then only to metal-seated gate valves used in water and wastewater service.