AWWA C500-19 pdf download.Metal-Seated Gate Valves for Water Supply Service
Sec. 1.1 Scope
AWWA C500-19 describes iron-body, metal-to-metal seated, nonrising- stem (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 fAuid velocities do not exceed 16 f/sec (4.9 m/sec) when the valve is in the fully open position.
1.1.1 Valve pressure ratings. The minimum design working water pressure shall be 200 psig (1,379 kPa) for valves 12 in. (300 mm) and smaller, and 150 psig (1,034 kPa) for valves with diameters of 14 in. (350 mm) and larger.
1.1.2 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, installation in unusually corrosive soil, conveyance of unusually corrosive water, excessive water hammer, or operation in a throttled position. Such 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, follower rings, and so forth, are not described in this standard.
Sec. 1.2
Purpose The purpose of this standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for metal seated gate valves for water supply service, including materials, design, testing, inspection, rejection, marking, and shipping.
Sec. 1.3 Application
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-scated gate valves used in water and wastewater service.
1.3.1 Valves in this standard. The valves encompassed by this standard require considerations for compatibility with the material being conveyed from both chemical and physical perspectives. Wastewater implies a lack of control over its chemical and physical composition. Valves in compliance with this standard may be suitable for wastewater applications; however, compliance does not ensure manufacturer approval of a specific valve in wastewater applications. Suitability for a specific valve should be determined by analyzing a particular wastewater application in conjunction with the manufacturer.AWWA C500-19 pdf download.