GB/T 12221-2005: Metal valves -- Face to face, end to end, center to face and center to end dimensions

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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.

Basic Data

Standard ID	GB/T 12221-2005 (GB/T12221-2005)
Description (Translated English)	Metal valves - Face to face, end to end, center to face and center to end dimensions
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J16
Classification of International Standard	23.060
Word Count Estimation	24,291
Date of Issue	2005-02-21
Date of Implementation	2005-08-01
Older Standard (superseded by this standard)	GB/T 12221-1989; GB/T 15188.1-1994; GB/T 15188.2-1994; GB/T 15188.3-1994; GB/T 15188.4-1994
Quoted Standard	GB/T 1047; GB/T 1048
Adopted Standard	ISO 5752-1982; MOD
Regulation (derived from)	Announcement of Newly Approved National Standards No. 5, 2005 (No. 79 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee
Summary	This standard specifies: flanged valves length of the structure, welding end valves length of the structure of the clip connecting valves length of the structure, the length of the threaded valve structure, external threaded connection valve structure length, their structure size limit deviations. This standard applies to: nominal pressure PN �� 42, MPa, DN DN3mm ~ DN4000mm-gate valves, globe valves, ball valves, butterfly valves, plug valves, diaphragm valves, check valves, etc. length of the structure.