ul-1478a.1Pressure Relief Valves for Sprinkler Systems
UL 1478A
1 Scope
1.1 These requirements cover pressure relief valves intended for use in sprinkler systems for fire protection service to relieve excessive pressures caused by thermal expansion, downstream of a pressure reducing valve or in valve trim.
Section 1 effective May 20, 20151.2 Requirements for installation of these valves are included in the Standard for the Installation of Sprinkler Systems, NFPA 13.