UL 1091:2010 PDF Download

UL 1091:2010 is a standard that specifies the requirements for butterfly valves that are intended to be used in piping systems that deliver water for fire-protection service. The standard covers the installation and use of valves in accordance with several standards, including NFPA 11, 13, 14, 15, 16, 20, 22, and 24. The standard specifies the types of materials that can be used in the construction of butterfly valves, the design and operational criteria, as well as the testing, certification, and marking requirements. The intended purpose of the standard is to provide assurance that the butterfly valves used for fire-protection service meet certain safety and performance requirements.