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三(san)(san)片式(shi)活接對焊球閥T型孔道(dao)可(ke)以使(shi)三(san)(san)個(ge)通(tong)(tong)(tong)(tong)道(dao)互相連(lian)通(tong)(tong)(tong)(tong)或(huo)使(shi)其中兩個(ge)通(tong)(tong)(tong)(tong)道(dao)連(lian)通(tong)(tong)(tong)(tong)，內(nei)螺(luo)紋三(san)(san)通(tong)(tong)(tong)(tong)球閥一(yi)般采用兩個(ge)閥座(zuo)結構(gou)，亦可(ke)根(gen)據用戶(hu)要求采用四閥座(zuo)結構(gou)。