API 602: Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller

Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller
for the Petroleum and Natural Gas Industries

API 602 standard specifies the requirements for a series of compact gate, globe, and check valves for petroleum and natural gas industry applications.

API 602 covers valves of the nominal pipe sizes

DN: — 8, 1 0, 1 5, 20, 25, 32, 40, 50, 65, 80, and 1 00;

corresponding to nominal pipe sizes NPS:

— 1 / 4 , 3 / 8 , 1 / 2 , 3 / 4 , 1 , 1 1 / 4 , 1 1 / 2 , 2, 2 1 / 2 , 3, and 4;

and applies to pressure class designations:

— 150, 300, 600, 800, and 1 500.

Class 800 is not a listed class designation, but is an intermediate class number widely used for welded and threaded end compact valves.

It includes provisions for the following valve characteristics:

— outside screw with rising stems (OS and Y), in sizes 8 ≤ DN ≤ 100 ( 1 / 4 ≤ NPS ≤ 4) and pressure designations including class 800;

— inside screw with rising stems (ISRS), in sizes 8 ≤ DN ≤ 65 ( 1 / 4 ≤ NPS ≤ 2 1 / 2 ) and pressure designations of classes ≤ 800;

— socket welding or threaded ends, in sizes 8 ≤ DN ≤ 65 ( 1 / 4 ≤ NPS ≤ 2 1 / 2 ) and pressure designations of class 800 and class 1 500;

— flanged or butt-welding ends, in sizes 15 ≤ DN ≤ 100 ( 1 / 2 ≤ NPS ≤ 4) and pressure designations of class 1 50 through class 1 500, excluding flanged end class 800;

— bonnet joint construction—bolted, welded, and threaded with seal weld for classes ≤ 1500 and union nut for classes ≤ 800;

— extended body, in sizes 15 ≤ DN ≤ 50 ( 1 / 2 ≤ NPS ≤ 2) and pressure designations of class 800 and class 1 500;

— bellows stem seal, in sizes 8 ≤ DN ≤ 50 ( 1 / 4 ≤ NPS ≤ 2) and pressure designations of ≤ class 1500;

— bellows stem seal testing requirements;

— standard and full-bore body seat openings;

— materials, as specified;

— testing and inspection.

API 602 standard is applicable to valve end flanges in accordance with ASME B1 6.5, valve body ends having tapered pipe threads to ASME B1 .20.1 , valve body ends having socket weld ends to ASME B1 6.1 1, and butt-weld connections per the requirements described within this standard.

This edition of API 602 states values in both metric and U.S. Customary units of measure. These systems of units are to be regarded separately. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems constitutes nonconformance with this standard.