icasqs 发表于 2020-11-27 16:47:06

阀门是PN64,法兰是PN63，为什么？

阀门Z41W-64R,配套的管法兰是PN63的压力等级，按照对阀门型号的解读，应该是64公斤压力的，但为什么不是配套64公斤的法兰呢？查了一下HG20592，GB9113，GB9131,都没发现有PN64的法兰，那么，这个PN64的阀门怎么来的？有人了解过这些来历吗？另外，现场的PN63法兰确实能配上PN64的阀门。

lsslss6338 发表于 2020-11-27 16:47:59

阀门压力命名或者选取一般比相应的管道压力等级持平或者稍高，只要阀门配对的法兰与管法兰对的上就没问题。

maureen 发表于 2020-11-27 16:53:39

两种习惯，一种是PN64，一种是PN63，以前用64的多，现在一般用63，没什么问题的，公称压力仅是一种概念性的东西，不要纠结于这类问题。

meidian88 发表于 2020-11-27 17:01:13

绝压和表压差别命名造成，其实是一个等级标准。

icasqs 发表于 2020-11-27 17:02:02

maureen 发表于 2020-11-27 16:53
两种习惯，一种是PN64，一种是PN63，以前用64的多，现在一般用63，没什么问题的，公称压力仅是一种概念性的 ...

谢谢楼主的回答，问了一下，说PN64是很早就出现的一个等级，PN63是后来才出现的，估计是替代PN64的，因有些标准是沿用了PN64没有改过来，所以造成了现有两个等级并用的现象，但后面化工出的标准都统一为PN63了，所以查不到。可以说，PN64和PN63是同一个压力等级。

phyllis 发表于 2020-11-27 17:02:42

没办法较真的事，你要把PN64的阀门上到PN16的法兰上才遇鬼了呢！
公称压力命名的差别！各有各习惯！

YANMUTANSD 发表于 2020-11-27 17:03:18

应该就是同一个标准，都按照64压力的来

yue_Moon 发表于 2020-11-27 17:03:39

一样的 我之前替换以前老阀门也发现PN64的铭牌 开始一脸懵逼 现在都是PN63了

daihai123 发表于 2021-1-8 18:11:15

阀门公称压力和法兰公称压力均来自 GB/T 1048

kakak 发表于 2021-4-13 09:00:08

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