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發(fā)布時間: 2015-8-13 16:42
正文摘要:閥的公稱管徑(NPS-NOMINAL PIPE SIZE),與流道的直徑不一定一致,其大小的選擇,由輸送流體的條件算出需求Cv值,然后由Cv值(參考制造廠商目錄)選定適合閥之口徑(NPS)公稱通徑為表征閥門口徑的名義內(nèi)徑,國標(biāo)以 ... |
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