Historical
IAPMO/ANSI Z1157-2014
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 ║C (73║F), 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]