手(Shou)动(Dong)卸(Xie)灰(Hui)球(Qiu)阀(Fa)球(Qiu)面(Mian)和(He)通(Tong)道(Dao)口(Kou)的(De)比(Bi)例(Li)应(Ying)该(Gai)是(Shi)这(Zhe)样(Yang)的(De),(?)即(Ji)当(Dang)球(Qiu)旋(Xuan)转(Zhuan)90度(Du)时(Shi),(?)在(Zai)进(Jin)、(?)出(Chu)口(Kou)处(Chu)应(Ying)全(Quan)部(Bu)呈(Cheng)现(Xian)球(Qiu)面(Mian),(?)从(Cong)而(?)截(Jie)断(Duan)流(Liu)动(Dong)。(?)具(Ju)有(You)相(Xiang)同(Tong)的(De)旋(Xuan)转(Zhuan)90度(Du)提(Ti)动(Dong)作(Zuo),(?)不(Bu)同(Tong)的(De)是(Shi)旋(Xuan)塞(Sai)体(Ti)是(Shi)球(Qiu)体(Ti),(?)有(You)圆(Yuan)形(Xing)通(Tong)孔(Kong)或(Huo)通(Tong)道(Dao)通(Tong)过(Guo)其(Qi)轴(Zhou)线(Xian)。(?)
查(Cha)看(Kan)详(Xiang)细(Xi)介(Jie)绍(Shao)