Resilient-Seated Gate Valves for Water Supply Service
|Publication Date:||25 January 2009|
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). These valves are intended for applications where fluid velocity does not exceed 16 ft/sec when the valve is in full open position.
Sizes. Gate valves described by this standard are 3-in. (75-mm), 4-in. (100-mm), 6-in. (150-mm), 8-in. (200-mm), 10-in. (250-mm), 12-in. (300-mm), 14-in. (350-mm), 16-in. (400-mm), 18-in. (450-mm), 20-in. (500-mm), 24-in. (600-mm), 30-in. (750-mm), and 36-in. (900-mm) nominal pipe size (NPS). Sizes refer to the nominal diameter, in inches (or millimeters), 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 [gauge]) for 3- through 12-in. (75- through 300-mm) sizes and 150 psig (1,034 kPa [gauge]) for 14- through 36-in. (350- through 900-mm) sizes.
Conditions and materials not described. This standard is not intended to describe special conditions of gate valve installation or operation, such as built-in power drive, 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 resilient-seated gate valves for water supply service, including materials, application, inspection, handling, and shipping.
This standard can be referenced in specifications for purchasing and receiving resilient-seated gate valves and can be used as a guide for fabricating and assembling resilient-seated gate valves for water supply service. The stipulations of this standard apply when this document has been referenced and then only to resilient-seated gate valves for water supply service applications.