EN764-1中3.18的nominal size是什么意思? nominal size numerical designation of size which is common to all components in a piping system other than components indicated by outside diameters or by thread size. it is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions 这句话就是解释公称尺寸的意思的。大致译为: 公称尺寸,尺寸的数值定义,与一个管路系统的所有部件参数一样,但并不指外形尺寸或螺纹尺寸。它是一个用于参考的方便的约整数,只是大致与加工尺寸相关。 [ ]查看更多