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IAPMO/ANSI Z1157-2014e1
Ball Valves
This standard covers ball valves in sizes NPS-1/8 to NPS-4, with minimum rated working pressures of 860 kPa (125 psi) at 23 ªC (73ªF), intended for use in water supply and distribution systems and specifies requirements for materials, physical characteristics, performance, testing, and markings.
Content Provider
International Association of Plumbing and Mechanical Officials [iapmo]