API Std 623 – Steel Globe Valves – Flanged and Butt-welding Ends, Bolted Bonnets, Second Edition
This API 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.
This standard sets forth the requirements for the following globe valve features:
bolted bonnet;
pressure seal bonnet;
outside screw and yoke;
rotating rising stems and nonrotating rising stems;
rising handwheels and nonrising handwheels;
straight pattern, y-pattern, right-angle;
stop-check (nonreturn type globe valves in which the disc may be positioned against the seat by action of the stem but is free to rise as a check valve due to flow from under the disc when the stem is in a full or partially open position);
