American Petroleum Institute
API-6D Specification for Pipeline Valves
API-6D SS Specification for Subsea Pipeline Valves
API-6A Specification for Wellhead and Christmas Tree Equipment
API-6FA Specification for Fire Test for Valves
API-594 Check Valves: Wafer, Wafer Lug, & Double Flanged Type
API 598 Valve Inspection & Testing
API-600 Bolted Bonnet Steel Gate Valves for Petroleum & Natural Gas Industries
API-602 Compact Steel Gate Valves – Flanged, Threaded, Welding & Extended – Body Ends
API-607 Fire Test for Soft-Seated Quarter – Turn Valves
API-608 Metal Ball Valves – Flanged, Threaded, & Welding End
API-609 Butterfly Valves: Double Flanged, Lug & Wafer – Type
API-Q1 Specifications for Quality Programs for the Petroleum, Petrochemical and Natural Gas

American Society of Mechanical Engineers
ASME-B1.20.1 Pipe Threads, General Purpose (inch)
ASME-B16.11 Forged Fittings, Socket-Welding & Threaded

ASME-B16.10 Face to Face & End to End Dimensions of Valves

ASME-B16. Pipe Flanges & Flanged Fittings NPS 1/2 ~ NPS 24

ASME-B16.47 Large Diameter Steel Flanges NPS 26 ~ NPS 60

ASME-B16.25 Buttwelding Ends

ASME-B16.34 Valves – Flanged, Threaded & Welding End