This Standard covers steel valves primarily intended for use in oil or gas pipeline systems. The following types of valves are covered:
(a) gate valves;
(b) plug valves;
(c) ball valves; and
(d) check valves.
1.2 Size, Nominal Pressure Class, and Category
This Standard covers valves in sizes from NPS 2 to NPS 60, inclusive. (Refer to Appendix A, Table A1.)
1.2.2 Nominal Pressure Class
This Standard covers valves having cold working-pressure ratings designated by nominal pressure classes from PN 20 to PN 420, inclusive. The standard nominal pressure classes are shown in Table 2. (ANSI class designations are shown in Appendix B.)
This Standard covers valves in the following categories:
(a) Category I - valves without requirements for proven notch toughness; and
(b) Category II - valves with requirements for proven notch toughness.
1.3 End Configuration
This Standard covers standard end requirements for flanged, buttwelding, and wafer-type valves. Other end configurations are considered nonstandard and are subject to agreement between the purchaser and the manufacturer.