Standard No.:	GB/T 12221-2005
English Name:	Metal calves--Face to face,end to end,center to face and center to end dimensions
Chinese Name:	金属阀门 结构长度
Chinese Classification:	J16    Valve
Professional Classification:	GB    National Standard
Issued by:	AQSIQ;SAC
Issued on:	2005-2-21
Implemented on:	2005-8-1
Status:	valid
Superseding:	GB/T 12221-1989 Metal valves for use in flanged pipe systems-Face-to-face and centre-to-face dimensions GB/T 15188.4-1994 Face-to-face,centre-to-face,end-to-end and centre-to-end dimensions of valves-Male screw valves GB/T 15188.3-1994 Face-to-face,centre-to-face,end-to-end and centre-to-end dimensions of valves-Female screw valves GB/T 15188.2-1994 Face-to-face,centre-to-face,end-to-end and centre-to-end dimensions of valves-Wafer valves GB/T 15188.1-1994 Face-to-face,centre-to-face,end-to-end and centre-to-end dimensions of valves-Buttwelding valves
Language:	English
File Format:	PDF
Word Count:	7000 words
Price(USD):	80.00
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1 Scope



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