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三片式(shi)活接(jie)對焊球閥(fa)T型孔道(dao)可以使三個(ge)通(tong)(tong)(tong)道(dao)互相連通(tong)(tong)(tong)或使其中兩(liang)個(ge)通(tong)(tong)(tong)道(dao)連通(tong)(tong)(tong)，內螺(luo)紋三通(tong)(tong)(tong)球閥(fa)一般采用(yong)兩(liang)個(ge)閥(fa)座結構(gou)(gou)，亦可根據(ju)用(yong)戶要求采用(yong)四閥(fa)座結構(gou)(gou)。