法國Lef Industries閥(fa)(fa)門 、Lef Industries截止(zhi)閥(fa)(fa)，Lef Industries儀表閥(fa)(fa)， LEF INDUSTRIES節流(liu)閥(fa)(fa)， Lef Industries調節閥(fa)(fa)

法國LEF INDUSTRIES閥是管路流體(ti)輸送系統(tong)中控制部件，它是用來改變通路斷(duan)面和介(jie)質流動方向，具有導流、截止、調節(jie)(jie)、節(jie)(jie)流、止回、分流或溢流卸壓等功能(neng).

 用(yong)于流(liu)體(ti)(ti)控(kong)制的(de)閥門(men)，從*簡(jian)單(dan)的(de)截止閥到*為復雜的(de)自(zi)控(kong)系統(tong)中所(suo)用(yong)的(de)各(ge)種(zhong)(zhong)閥門(men)，其品(pin)種(zhong)(zhong)和(he)規格繁多，閥門(men)的(de)公稱通徑從*微小的(de)儀(yi)表(biao)閥大至通徑達10m的(de)工業管路(lu)用(yong)閥.閥門(men)可用(yong)于控(kong)制水、蒸汽、油品(pin)、氣體(ti)(ti)、泥(ni)漿、各(ge)種(zhong)(zhong)腐(fu)蝕(shi)性介質、液態金屬和(he)放射(she)性流(liu)體(ti)(ti)等各(ge)種(zhong)(zhong)類型流(liu)體(ti)(ti)的(de)流(liu)動(dong) .

閥門(men)的(de)(de)(de)工作(zuo)壓力(li)可(ke)從1.3х10MPa到1000MPa 的(de)(de)(de)超高壓，工作(zuo)溫(wen)度(du)從-269℃的(de)(de)(de)超低溫(wen)到1430℃的(de)(de)(de)高溫(wen).閥門(men)的(de)(de)(de)控(kong)制可(ke)采用多種傳動(dong)(dong)(dong)(dong)方式， 如(ru)手動(dong)(dong)(dong)(dong)、電(dian)(dian)動(dong)(dong)(dong)(dong)、液動(dong)(dong)(dong)(dong)、氣(qi)動(dong)(dong)(dong)(dong)、蝸輪(lun)、電(dian)(dian)磁動(dong)(dong)(dong)(dong)、電(dian)(dian)磁－－液動(dong)(dong)(dong)(dong)、電(dian)(dian)－－液動(dong)(dong)(dong)(dong)、氣(qi)－－液動(dong)(dong)(dong)(dong)、正齒輪(lun)、傘齒輪(lun)驅動(dong)(dong)(dong)(dong)等;可(ke)以在壓力(li)、溫(wen)度(du)或其它形式傳感信號的(de)(de)(de)作(zuo)用下，按(an)預定的(de)(de)(de)要求動(dong)(dong)(dong)(dong)作(zuo)，或者(zhe)不依賴傳感信號而進行簡單(dan)的(de)(de)(de)開啟或關閉(bi)，閥門(men)依靠驅動(dong)(dong)(dong)(dong)或自動(dong)(dong)(dong)(dong)機構(gou)使啟閉(bi)件作(zuo)升降、滑移、旋擺或回(hui)轉(zhuan)運(yun)動(dong)(dong)(dong)(dong)， 從而改變其流道面(mian)積的(de)(de)(de)大(da)小以實(shi)現其控(kong)制功能(neng).