American Petroleum Institute

API Q1 Specification for quality programs

API 6D Specification for pipeline valves

API 6FA Fire test for valves

API 598 Valve inspection and testing

API 600 Steel gate valves, flanged and buttwelding ends, bolted and pressure seal bonnets

API 602 Compact steel gate valves – flanged, threaded, welding, and extended body ends

API 607 Fire test for soft seated quarter turn valves

API 608 Metal ball valves – flanged and butt welding ends

API 609 Butterfly Valves: Double Flanged, Lug- and Wafer-Type

API-6A-STANDARD-VALVE

API-6D-CHECK-VALVE

API-609-BUTTERFLY-VALVE