The pipe length is involved in calculating the Cv value, and this pipe length refers to which part of the valve
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When calculating the Cv value, the length of the piping is taken into account; which specific length does this refer to?
There isn’t any~~~~~~~~
The CV value has nothing to do with the piping length
"1. Comparison of valve capacity coefficients At present, the capacity coefficient of valves is mostly expressed using the Cv value; therefore, the following explanation will use the Cv value as an example. The Cv value is rather abstract and difficult to understand, so a more specific explanation will be provided below. (1) The magnitude of the Cv value and calculation examples The magnitude of the Cv value depends on conditions such as flow rate, pressure difference, and specific gravity; it is relatively difficult to understand merely from a conceptual perspective. It becomes easier to comprehend when it is expressed in terms related to the diameters of pipes and orifices. Therefore, relevant comparison examples are presented below. (For reference: Imported valves – VENN, VENN valves, KITZ, KITZ valves; valve selection parameters are provided.) ■When the Cv value is 1, the relationship with the pipe diameter. Flow direction: DL. When the internal thickness of the pipe is equivalent to that of a Schedule 40 steel pipe, and D is the inner diameter of the pipe while L is its length, the conditions when Cv=1 are roughly as shown in [Table 1]. " Entry: http://baike.baidu.com/view/2417933.htm This is the exact text from Baidu Baike, and I’m completely confused by it.
That’s right; the CV value has nothing to do with the length of the piping, right?~
You can ask the supplier to calculate the CV value for you. They have specialized software for that. .