ANSI AWWAC508-2001 pdf download SWING-CHECK VALVES FOR WATERWORKS SERVICE, 2-IN. THROL IGH 24-IN. (50-mm THROUGH 600-mm) NPS
Sec.1.1 Scope This standard describes only iron-body, nonassisted, swing check valves, 2-in. through 24-in. (50-mm through 600-mm) NPS, with mechanical-joint or flanged ends that are installed in approximately level settings in water systems.
The manufac- turer should be consulted for special conditions. Check valve sizes described in this standard are2-, 2/2-, 3-, 4-, 6-, 8-, 10-, 12-, 14-, 16-, 18-, 20-, and 24-in. (50-, 65-, 75-, 100-, 150, 200-, 250, 300-, 350-, 400-, 450-, 500-, and 600-mm) NPS. Sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and the seat ring.
1.1.1 Seating types. Check valves may be of the metal-to metal, resilient- to-metal, or resilient-to-coated seat construction as illustrated in Figure 1.
1.1.2 Hinge arm types. Check valves may incorporate either a metal or resilient hinge arm as illustrated in Figure 1.
1.1.3 Waterway types. Swing-check valves may be of the clear waterway design (where the disc in the full open position swings clear of the waterway) or the 150 psig (1,030 kPa) for check valves 14-in. through 24-in. (350-mm through 600-mm) NPS inclusive. The working water temperature shall not exceed 125°F (52*C).
1.1.5 Conditions not described. The following design and installation conditions are not described in this standard.
1.1.5.1 Swing-check valves for use in lines. conveying water of unusual corrosivity are not described in this standard. Example: Water with a pH less than 6.
1.1.5.2 Conditions of water hammer, hydraulic pulsation， and excessive operating noise are beyond the scope of this standard and require special design and construction consideration. Sec.
1.2 Purpose The purpose of this standard is to provide the minimum requirements for swingcheck valves for waterworks service, 2-in. through 24-in. (50-mm through 600-mm) NPS, including materials and testing.
Sec. 1.3 Application This standard can be referenced in specifications for swing-check valves for waterworks service, 2 in. through 24 in. (50 mm through 600 mm). The stipulations of this standard apply when this document has been referenced and then only to swing-check valves for waterworks service, 2 in. through 24 in. (50 mm through 600 mm).
SECTION 2: REFERENCES This standard references the following documents. In their latest editions, they form a part of this standard to the extent specified within the standard. In any case of conflict, the requirements of this standard shall prevail. ANSI /ASMEt B16.1-Cast Iron Pipe Flanges and Flanged Fittings. ANSIASME B18.2.1- Square and Hex Bolts and Screws (Inch Series). ANSIASME B18.2.2- Square and Hex Nuts (Inch Series).