調(diào)節(jié)閥新品種進(jìn)一步產(chǎn)生，出現(xiàn)隔膜閥、角型閥、蝶閥、球閥等。50年代：球閥得到較大的推廣使用，三通閥代替兩臺(tái)單座閥投入系統(tǒng)。60年代：在國內(nèi)對(duì)上述產(chǎn)品進(jìn)行了系列化的改進(jìn)設(shè)計(jì)和標(biāo)準(zhǔn)化、規(guī)范化后，國內(nèi)才才有了完整系列產(chǎn)品
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