氣動高真空擋板閥
高真空擋板閥,,上海品牌 - 上海雄工閥門有限公司 |
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GD型(xing)(xing)用于接(jie)通(tong)或切斷真空管路中的(de)氣(qi)流。控制(zhi)執行氣(qi)缸驅動閥(fa)門作啟閉運動。帶反(fan)饋信號裝置(zhi)。適用介質為純凈空氣(qi)和(he)非腐(fu)蝕性(xing)氣(qi)體(ti)。高真空擋板閥(fa)按軸(zhou)封結構可分GD-J型(xing)(xing)橡膠軸(zhou)封和(he)GD-J(b)型(xing)(xing)波紋管軸(zhou)封兩種。按通(tong)導形式可分GD-J為角通(tong)型(xing)(xing)式，GD-S為帶預(yu)抽口的(de)三通(tong)型(xing)(xing)式。 的(de)(de)啟(qi)閉(bi)件是(shi)(shi)閘(zha)(zha)板(ban)(ban)(ban)，閘(zha)(zha)板(ban)(ban)(ban)的(de)(de)運(yun)動方向(xiang)與流(liu)體(ti)方向(xiang)相垂直(zhi)(zhi)，閘(zha)(zha)閥(fa)(fa)(fa)(fa)只能(neng)作(zuo)(zuo)(zuo)全(quan)開(kai)和(he)全(quan)關(guan),不能(neng)作(zuo)(zuo)(zuo)調節和(he)節流(liu)。閘(zha)(zha)板(ban)(ban)(ban)有(you)兩個(ge)密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian),最(zui)常(chang)用(yong)的(de)(de)模(mo)式閘(zha)(zha)板(ban)(ban)(ban)閥(fa)(fa)(fa)(fa)的(de)(de)兩個(ge)密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)形成楔形、楔形角隨參數而異,通(tong)(tong)常(chang)為50,介(jie)質(zhi)溫度不高時(shi)(shi)為2°52'。楔式閘(zha)(zha)閥(fa)(fa)(fa)(fa)的(de)(de)閘(zha)(zha)板(ban)(ban)(ban)可(ke)以(yi)(yi)做(zuo)(zuo)成一個(ge)整 體(ti)，叫(jiao)(jiao)做(zuo)(zuo)剛(gang)性閘(zha)(zha)板(ban)(ban)(ban)；也可(ke)以(yi)(yi)做(zuo)(zuo)成能(neng)產生微量變(bian)形的(de)(de)閘(zha)(zha)板(ban)(ban)(ban),以(yi)(yi)改善其工(gong)藝性,彌補密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)角度在加工(gong)過(guo)程中產生的(de)(de)偏差,這種(zhong)(zhong)閘(zha)(zha)板(ban)(ban)(ban)叫(jiao)(jiao)做(zuo)(zuo)彈性閘(zha)(zha)板(ban)(ban)(ban)。閘(zha)(zha)閥(fa)(fa)(fa)(fa)關(guan)閉(bi)時(shi)(shi),密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)可(ke)以(yi)(yi)只依靠介(jie)質(zhi)壓(ya)(ya)力(li)來密(mi)封(feng)(feng)(feng)(feng)(feng),即(ji)(ji)依靠介(jie)質(zhi)壓(ya)(ya)力(li)將(jiang)(jiang)閘(zha)(zha)板(ban)(ban)(ban)的(de)(de)密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)壓(ya)(ya)向(xiang)另一側的(de)(de)閥(fa)(fa)(fa)(fa)座(zuo)來保證密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)的(de)(de)密(mi)封(feng)(feng)(feng)(feng)(feng)，這就是(shi)(shi)自密(mi)封(feng)(feng)(feng)(feng)(feng)。大部分是(shi)(shi)采用(yong)強(qiang)制密(mi)封(feng)(feng)(feng)(feng)(feng)的(de)(de),即(ji)(ji)閥(fa)(fa)(fa)(fa)門(men)關(guan)閉(bi)時(shi)(shi)，要依靠外力(li)強(qiang)行(xing)(xing)將(jiang)(jiang)閘(zha)(zha)板(ban)(ban)(ban)壓(ya)(ya)向(xiang)閥(fa)(fa)(fa)(fa)座(zuo),以(yi)(yi)保證密(mi)封(feng)(feng)(feng)(feng)(feng)面(mian)(mian)的(de)(de)密(mi)封(feng)(feng)(feng)(feng)(feng)性。閘(zha)(zha)閥(fa)(fa)(fa)(fa)的(de)(de)閘(zha)(zha)板(ban)(ban)(ban)隨閥(fa)(fa)(fa)(fa)桿(gan)(gan)(gan)(gan)一起(qi)作(zuo)(zuo)(zuo)直(zhi)(zhi)線(xian)運(yun)動的(de)(de)，叫(jiao)(jiao)升(sheng)降桿(gan)(gan)(gan)(gan)閘(zha)(zha)閥(fa)(fa)(fa)(fa)亦叫(jiao)(jiao)明桿(gan)(gan)(gan)(gan)閘(zha)(zha)閥(fa)(fa)(fa)(fa)。通(tong)(tong)常(chang)在升(sheng)降桿(gan)(gan)(gan)(gan)上有(you)梯形螺(luo)紋(wen)，通(tong)(tong)過(guo)閥(fa)(fa)(fa)(fa)門(men)頂端的(de)(de)螺(luo)母(mu)以(yi)(yi)及閥(fa)(fa)(fa)(fa)體(ti)上的(de)(de)導槽，將(jiang)(jiang)旋轉(zhuan)(zhuan)運(yun)動變(bian)為直(zhi)(zhi)線(xian)運(yun)動,也就是(shi)(shi)將(jiang)(jiang)操(cao)作(zuo)(zuo)(zuo)轉(zhuan)(zhuan)矩變(bian)為操(cao)作(zuo)(zuo)(zuo)推力(li)。開(kai)啟(qi)閥(fa)(fa)(fa)(fa)門(men)時(shi)(shi)，當(dang)閘(zha)(zha)板(ban)(ban)(ban)提升(sheng)高度等于閥(fa)(fa)(fa)(fa)門(men)通(tong)(tong)徑的(de)(de)1：1倍(bei)時(shi)(shi)，流(liu)體(ti)的(de)(de)通(tong)(tong)道完全(quan)暢(chang)通(tong)(tong)，但(dan)在運(yun)行(xing)(xing)時(shi)(shi)，此位(wei)(wei)置(zhi)(zhi)是(shi)(shi)無法監視的(de)(de)。實際使(shi)用(yong)時(shi)(shi)，是(shi)(shi)以(yi)(yi)閥(fa)(fa)(fa)(fa)桿(gan)(gan)(gan)(gan)的(de)(de)頂點作(zuo)(zuo)(zuo)為標志，即(ji)(ji)開(kai)不動的(de)(de)位(wei)(wei)置(zhi)(zhi)，作(zuo)(zuo)(zuo)為它(ta)的(de)(de)全(quan)開(kai)位(wei)(wei)置(zhi)(zhi)。為考慮溫度變(bian)化(hua)出現(xian)鎖死現(xian)象,通(tong)(tong)常(chang)在開(kai)到頂點位(wei)(wei)置(zhi)(zhi)上,再倒回1/2－1圈,作(zuo)(zuo)(zuo)為全(quan)開(kai)閥(fa)(fa)(fa)(fa)門(men)的(de)(de)位(wei)(wei)置(zhi)(zhi)。因(yin)此,的(de)(de)全(quan)開(kai)位(wei)(wei)置(zhi)(zhi)，按閘(zha)(zha)板(ban)(ban)(ban)的(de)(de)位(wei)(wei)置(zhi)(zhi)即(ji)(ji)行(xing)(xing)程來確定。有(you)的(de)(de)閘(zha)(zha)閥(fa)(fa)(fa)(fa),閥(fa)(fa)(fa)(fa)桿(gan)(gan)(gan)(gan)螺(luo)母(mu)設在閘(zha)(zha)板(ban)(ban)(ban)上，手輪轉(zhuan)(zhuan)動帶動閥(fa)(fa)(fa)(fa)桿(gan)(gan)(gan)(gan)轉(zhuan)(zhuan)動,而使(shi)閘(zha)(zha)板(ban)(ban)(ban)提升(sheng),這種(zhong)(zhong)閥(fa)(fa)(fa)(fa)門(men)叫(jiao)(jiao)做(zuo)(zuo)旋轉(zhuan)(zhuan)桿(gan)(gan)(gan)(gan)閘(zha)(zha)閥(fa)(fa)(fa)(fa)或叫(jiao)(jiao)暗桿(gan)(gan)(gan)(gan)閘(zha)(zha)閥(fa)(fa)(fa)(fa)。
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