American Petroleum Institute

Steel Globe Valves—Flanged and Buttwelding Ends, Bolted Bonnets - FIRST EDITION
 N STD 623

Annotation

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, 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: