API Standard 526 Eighth Edition

API Std 526 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.