API Std 526:2017 PDF

This standard is a purchase specification for flanged steel pressure-relief valves. Basic requirements are given for direct spring-loaded pressure-relief valves and pilot-operated pressure-relief valves as follows:— orifice designation and area;— valve size and pressure rating, inlet and outlet;— materials;— pressure-temperature limits;— center-to-face dimensions, inlet and outlet.Nameplate nomenclature and requirements for stamping are detailed in Annex A.