API STD 623

Anotace textu normy API STD 623 :

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); 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, 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. See more