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金属阀门 结构长度 GB/T 12221-2005
Metal valves—Face to face,end to end,center to facecenter to end dimensions
(ISO 5752:1982,Metal valves for use in flanged pipe systems—Face-to-facecenter-to-face dimensions,MOD)
代替GB/T 12221-1989,GB/T 15188.1~15188.4-1994
1 范围
本标准规定了法兰连接阀门的结构长度、焊接端阀门的结构长度、对夹连接阀门的结构长度、内螺纹连接阀门结构长度、外螺纹连接阀门结构长度,及其结构尺寸的极限偏差。
本标准适用于公称压力PN≤42.0 MPa,公称通径DN3 mm~DN4 000 mm的闸阀、截止阀、球阀、蝶阀、旋塞阀、隔膜阀、止回阀等的结构长度。
2 规范性引用文件
下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件,其随后所有的修改单(不包括勘误的内容)或修订版均不适用于本标准,然而,鼓励根据本标准达成协议的各方研究是否可使用这些文件的最新版本。
GB/T 1047 管道元件DN公称尺寸的定义和选用GB/T 1047-2005,ISO 6708:1995,MOD
GB/T 1048 管道元件PN公称压力的定义和选用GB/T 1048-2005,ISO 7268:1996,MOD
3 术语
3.1 直通式阀门结构长度 through way type of valves face to face,end to end, center to facecenter to end dimensions
在阀体通道终端两个垂直于阀门轴线平面之间的距离。
3.2 角式阀门结构长度 angle type of valves face to face,end to end,center to facecenter to end dimensions
在阀体通道某一端垂直于轴线的平面与阀体另一终端轴线之间的距离。
3.3 对夹式阀门 wafer type valves
靠管道法兰夹持固定密封结构的阀门。其结构长度指阀体通道终端两个与管道法兰接触面之间的距离。
4 结构长度尺寸与极限偏差
4.1 公称通径数值按GB/T 1047的规定;公称压力数值按CB/T 1048的规定。
4.2 直通式阀门结构长度如图l所示;角式阀门结构长度如图2所示;对夹连接阀门结构长度如图3所示。
4.3 结构长度尺寸
4.3.1 法兰连接阀门结构长度基本系列见表1。
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