API STD 623 Steel Globe Valves-Flanged and Butt-welding Ends, Bolted Bonnets, First Edition
: Brown Technical Book Store
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, outside screw and yoke, rotating rising stems, and nonrotating rising stems, rising handwheels and nonrising handwheels, conventional, 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), plug, narrow, conical, ball, or guided disc, metallic seating surfaces, flanged or butt-welding ends. It covers valves of the nominal pipe sizes NPS: 2, 21/2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24; corresponding to nominal pipe sizes DN: 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600; applies for pressure class designations: 150, 300, 600, 900, 1500, 2500.