Regarding the basic code for butterfly valves, I have a question
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This is the basic code for butterfly valves; it’s all J. I only know that J1 refers to a standard soft-sealed wafer type. May I ask the experts here, what do J3 and J4 mean?
This post was last edited by nocklee on 2021-5-15 at 10:26. The following are my personal opinions, which may not be correct: The number after J is just a code; what this table indicates is that all lengths for wafer-type valves should refer to this table (apart from wafer butterfly valves, there are also other valves such as wafer check valves). As for the total length of wafer butterfly valves, one needs to refer to the regulations regarding their total length – this table does not provide that information
Just like with tolerance tables, when I write H7 or H6, I often can’t remember the exact tolerance values, so I need to consult such tables to find out the specific numbers
This post was last edited by nocklee on 2021-5-15 at 10:34. For butterfly valves, specific details can be found in Table 10 of GB/T 12221-2005. The statement you made that “J1 represents universal soft-sealed wafer-type valves” is also inaccurate; firstly, whether it is a soft-seal or a hard-seal has nothing to do with the structural length, and secondly, J1 does not denote universality – it can only be said that most butterfly valves available on the market today are of the short-series type
Okay, thank you. I’ll go take a look
J is just a code for a series, not a butterfly valve model. The normal way to specify the ordering parameters is as follows: D71X-16Q DN150; for the length of the butterfly valve, the value from series J1 in Table 4 of GB/T 12221-2005 should be used
Is J the abbreviation of the Chinese pinyin for \"jiā\"? If so, it’s just a clamping solution or code, with no practical meaning