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Q645F氣(qi)動(dong)(dong)三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)可(ke)(ke)分(fen)為L形(xing)氣(qi)動(dong)(dong)三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)和T形(xing)氣(qi)動(dong)(dong)三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)，L形(xing)（Q44F）三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)用于介質流向的切(qie)換(huan)，能(neng)使(shi)(shi)相(xiang)互垂(chui)直的兩個(ge)通(tong)(tong)(tong)道連(lian)接；T形(xing)（Q45F）三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)用于介質分(fen)流、合(he)流及流向切(qie)換(huan)。T形(xing)三(san)(san)通(tong)(tong)(tong)可(ke)(ke)以使(shi)(shi)三(san)(san)個(ge)通(tong)(tong)(tong)道相(xiang)互連(lian)通(tong)(tong)(tong)或使(shi)(shi)其(qi)中的兩個(ge)通(tong)(tong)(tong)道連(lian)通(tong)(tong)(tong)。三(san)(san)通(tong)(tong)(tong)球(qiu)閥(fa)一般采用兩閥(fa)座結(jie)構，亦(yi)可(ke)(ke)根(gen)據用戶要求采用四閥(fa)座結(jie)構。