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今天我們(men)來給大家簡單的介紹一(yi)些硬密封球(qiu)閥的結構與工作原理。

1,概述
由于球閥具有流阻小、啟閉速度快和操作簡單等特點,因此使用非常廣泛,如石油、化工、電站和石油、天燃氣長輸管線等。球閥的密封是通過在球體和閥座之間預先設定的預緊力加上流體壓力在閥座密封面上引起的作用力形成的,一般球閥的預緊力采用在閥座與閥體配合部位之間設置彈性元件,如碟形彈簧和柱狀彈簧等來形成。硬密封球閥在啟閉過程中,預緊力始終作用在密封副的表面上,致使球閥的啟閉力矩大于其他類型閥門。同時預緊力也加大了密封件的磨損,影響了球閥的使用壽命。為了克服上述缺點,在球體與閥座之間設計了螺旋傳動機構。
2、工作原理
球閥由閥體、閥蓋、球體、閥座和閥桿等組成
　　閥(fa)(fa)(fa)座在(zai)閥(fa)(fa)(fa)體(ti)內(nei)沿軸線(xian)(xian)移動(dong)(dong)(dong)(dong)是由(you)螺(luo)(luo)線(xian)(xian)傳動(dong)(dong)(dong)(dong)機構完(wan)成的(de)。具體(ti)是在(zai)球(qiu)體(ti)上(shang)(shang)下(xia)各(ge)安裝(zhuang)一(yi)個圓形傳動(dong)(dong)(dong)(dong)盤,在(zai)傳動(dong)(dong)(dong)(dong)盤上(shang)(shang)設有螺(luo)(luo)線(xian)(xian)槽(cao),傳動(dong)(dong)(dong)(dong)盤隨球(qiu)體(ti)一(yi)起轉(zhuan)動(dong)(dong)(dong)(dong)。在(zai)閥(fa)(fa)(fa)座上(shang)(shang)下(xia)各(ge)設置傳動(dong)(dong)(dong)(dong)銷,傳動(dong)(dong)(dong)(dong)銷與傳動(dong)(dong)(dong)(dong)盤上(shang)(shang)的(de)螺(luo)(luo)線(xian)(xian)槽(cao)相嚙(nie)合(he)。當啟(qi)閉(bi)閥(fa)(fa)(fa)門時(shi),球(qiu)體(ti)轉(zhuan)動(dong)(dong)(dong)(dong)并帶(dai)動(dong)(dong)(dong)(dong)傳動(dong)(dong)(dong)(dong)盤一(yi)起轉(zhuan)動(dong)(dong)(dong)(dong)。當閥(fa)(fa)(fa)門關(guan)閉(bi)時(shi),傳動(dong)(dong)(dong)(dong)盤上(shang)(shang)的(de)螺(luo)(luo)線(xian)(xian)槽(cao)通過(guo)閥(fa)(fa)(fa)座上(shang)(shang)的(de)傳動(dong)(dong)(dong)(dong)銷拉動(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)座向球(qiu)體(ti)運動(dong)(dong)(dong)(dong),在(zai)關(guan)閉(bi)瞬間與球(qiu)體(ti)緊密(mi)接觸,實(shi)現密(mi)封。在(zai)開啟(qi)瞬間,螺(luo)(luo)線(xian)(xian)槽(cao)通過(guo)閥(fa)(fa)(fa)座上(shang)(shang)的(de)傳動(dong)(dong)(dong)(dong)銷推(tui)動(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)座脫(tuo)離球(qiu)體(ti),實(shi)現無摩擦操作。