This Standard specifies the basic series of face-to-face, centre-to-face, end-to-end and centre-to-end dimensions of flanged joint valves, welded end valves, wafer type connection valves, female thread connection valves, male thread connection valves, and the permissible variations of structural dimensions.
This standard is applicable to the face-to-face, centre-to-face, end-to-end and centre-to-end dimensions of gate valves, stop valves, ball valves, butterfly valves, plug valves, diaphragm valves and check valves with nominal pressure (PN) ≤ 42.0 MPa and nominal diameter of DN 3 mm ~ DN 4 000 mm.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below.
GB/T 1047 Pipework Components — Definition and Selection of DN (Nominal Size) (GB/T 1047-2005, ISO 6708:1995, MOD)
GB/T 1048 Pipework Components — Definition and Selection of PN (GB/T 1048-2005, ISO 7268:1996, MOD)
3 Definitions
GB/T 12221-2005 The following standards are cited：
