API Std 623 Draft. Steel Globe Valves-Flanged and Butt-welding Ends, Bolted Bonnets

American Petroleum Institute (API). Draft. First Edition. 29p. This standard specifies the requirements for a heavy-duty series of bolted bonnet steel globe valves for petroleum refinery and related applications where corrosion, erosion and other service conditions would indicate a need for heavy wall sections and large stem diameters.