API 602 Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries

This International Standard specifies the requirements for a series of compact steel gate, globe and check valves for petroleum and natural gas industry applications.

It is applicable to valves of
– nominal sizes DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80 and 100,
– corresponding to nominal pipe sizes NPS ¼, ⅜, ½, ¾, 1, 1¼, 1½, 2, 2½, 3 and 4, and to pressure designations of Class 150, Class 300, Class 600, Class 800 and Class 1500.
Class 800 is not a listed class designation, but is an intermediate class number widely used for socketwelding and threaded end compact valves.

It includes provisions for the following valve characteristics:
– outside screw with rising stems (OS & Y), in sizes 8 ≤ DN ≤ 100 and pressure 150 ≤ DN ≤ 1500 designations including Class 800;
– inside screw with rising stems (ISRS), in sizes 8 ≤ DN ≤ 65 and pressure designations of Class ≤ 800;
– socket-welding or threaded ends, in sizes 8 ≤ DN ≤ 65 and pressure designations of Class 800 and Class 1500;
– flanged or butt-welding ends, in sizes 15 ≤ DN ≤ 100 and pressure designations of 150 ≤ DN ≤ 1500, excluding flanged end Class 800;
– bonnet joint construction — bolted, welded and threaded with seal weld for Class ≤ 1500 and union nut for Class ≤ 800;
– body seat openings;
– materials, as specified;
– testing and inspection.

This International Standard is applicable to valve end flanges in accordance with ASME B 16.5 and valve body ends having tapered pipe threads to ISO 7-1 or ASME B 1.20.1. It is applicable to extended body construction in sizes and pressure designations of Class 800 and Class 1500, and to bellows and bellows assembly construction as may be adaptable to gate or globe valves in sizes . It covers bellows stem seal type testing requirements.