Reduced-Wall, Resilient-Seated Gate Valves for Water Supply Service
|Publication Date:||25 January 2009|
This standard describes reduced-wall, 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° to 125°F (0.6° to 52°C). These valves are intended for applications where fluid velocity does not exceed 16 ft/sec (4.9 m/sec) when the valve is in the fully open position.
Sizes. This standard describes nonrising stem resilient seated gate valves 3-in. (75-mm) NPS* through 48-in. (1,200-mm) NPS and outside screw and yoke (OS&Y) rising stem valves, 3-in. (75-mm) NPS through 16-in. (400-mm) NPS. Sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and the closure area.
Valve pressure rating. The minimum design working water pressure shall be 200 psig (1,380 kPa) for all sizes.
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. Joint accessories for end connections, such as bolts, gaskets, glands, and follower rings, are not described in this standard.
The purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for reduced-wall, resilient-seated gate valves for water supply service, including materials, design, testing, inspection, rejection, marking, and shipping.
This standard can be referenced in specifications for purchasing and receiving reduced-wall, resilient-seated gate valves for water supply service. The stipulations of this standard apply when this document has been referenced and then only to reduced-wall, resilient-seated gate valves for water supply service.
* Nominal pipe size.