API Std 599 Eighth Edition PDF
Covers steel, nickel base and other alloy plug valves with flanged or butt-welding ends and ductile iron plug valves with flanged ends in sizes NPS 1/2 through NPS 36 and threaded or socket-welding ends for sizes NPS 1/2 through NPS 2. This standard also provides additional requirements for plug valves that are in full conformance to the requirements of ASME B16.34 for Standard Class 150 through 2500.
