The standard is a purchase specification for flanged steel pressure relief valves. Pertains to inspection by the purchaser and to any supplementary examinations the purchaser may require at the valve manufacturer’s plant. ANSI/API 599. Metal PlugValves – Flanged, Threaded and Welding Ends

Swing check valves. – Piston check valves. – Dual plate check valves. – Butterfly check valves. – Emergency assisted check valves. – Testable check valves. – Tilting disc check valves.