当(Dang)两(Liang)个(Ge)圆(Yuan)形(Xing)阀(Fa)座(Zuo)固(Gu)定(Ding)在(Zai)球(Qiu)体(Ti)上(Shang)游(You)和(He)下(Xia)游(You)两(Liang)侧(Ce)时(Shi),(?)通(Tong)常(Chang)叫(Jiao)做(Zuo)双(Shuang)阀(Fa)座(Zuo)。(?)双(Shuang)阀(Fa)座(Zuo)设(She)计(Ji)成(Cheng)要(Yao)适(Shi)应(Ying)球(Qiu)体(Ti)密(Mi)封(Feng)表(Biao)面(Mian)。(?)在(Zai)中(Zhong)等(Deng)压(Ya)力(Li)降(Jiang)和(He)使(Shi)用(Yong)弹(Dan)性(Xing)体(Ti)阀(Fa)座(Zuo)材(Cai)料(Liao)时(Shi),(?)双(Shuang)阀(Fa)座(Zuo)球(Qiu)阀(Fa)是(Shi)可(Ke)以(Yi)得(De)到(Dao)吹(Chui)泡(Pao)严(Yan)密(Mi)的(De)关(Guan)闭(Bi)。(?)几(Ji)种(Zhong)其(Qi)他(Ta)阀(Fa)座(Zuo)布(Bu)置(Zhi)体(Ti)不(Bu)与(Yu)阀(Fa)杆(Gan)固(Gu)定(Ding),(?)并(Bing)允(Yun)许(Xu)通(Tong)过(Guo)键(Jian)槽(Cao)有(You)某(Mou)些(Xie)自(Zi)由(You)运(Yun)动(Dong)。(?)对(Dui)于(Yu)浮(Fu)球(Qiu),(?)上(Shang)游(You)的(De)流(Liu)体(Ti)压(Ya)力(Li)通(Tong)过(Guo)推(Tui)动(Dong)球(Qiu)体(Ti)朝(Chao)向(Xiang)候(Hou)补(Bu)或(Huo)下(Xia)游(You)阀(Fa)座(Zuo)而(?)有(You)助(Zhu)于(Yu)密(Mi)封(Feng)。(?)另(Ling)一(Yi)种(Zhong)阀(Fa)座(Zuo)结(Jie)构(Gou)涉(She)及(Ji)浮(Fu)动(Dong)阀(Fa)座(Zuo),(?)此(Ci)处(Chu)球(Qiu)体(Ti)被(Bei)固(Gu)定(Ding)((?)叫(Jiao)做(Zuo)耳(?)轴(Zhou)固(Gu)定(Ding)球(Qiu)体(Ti))(?)在(Zai)两(Liang)个(Ge)支(Zhi)点(Dian),(?)工(Gong)艺(Yi)压(Ya)力(Li)将(Jiang)上(Shang)游(You)阀(Fa)座(Zuo)推(Tui)向(Xiang)球(Qiu)体(Ti)密(Mi)封(Feng)表(Biao)面(Mian)。(?)此(Ci)阀(Fa)座(Zuo)也(Ye)可(Ke)在(Zai)组(Zu)装(Zhuang)过(Guo)程(Cheng)中(Zhong),(?)使(Shi)用(Yong)具(Ju)有(You)弹(Dan)簧(Huang)作(Zuo)用(Yong)阀(Fa)座(Zuo)被(Bei)预(Yu)加(Jia)应(Ying)力(Li)。(?)在(Zai)阀(Fa)体(Ti)安(An)装(Zhuang)之(Zhi)后(Hou),(?)此(Ci)结(Jie)构(Gou)向(Xiang)耳(?)轴(Zhou)安(An)装(Zhuang)球(Qiu)体(Ti)连(Lian)续(Xu)施(Shi)加(Jia)压(Ya)力(Li),(?)同(Tong)时(Shi)顶(Ding)部(Bu)工(Gong)件(Jian)也(Ye)向(Xiang)整(Zheng)个(Ge)闭(Bi)合(He)元(Yuan)件(Jian)施(Shi)加(Jia)负(Fu)荷(He)。(?)