電動切斷閥 Electric cut-off valve-分散控制系統(DCS)
電動切斷(duan)閥是安全(quan)儀(yi)表系統(tong)(tong)(SIS)與(yu)分散控制系統(tong)(tong)(DCS)在工業生產(chan)過程中(zhong)起著(zhu)重要(yao)的(de)作用,對出現(xian)異常(chang)工況(kuang)迅(xun)速(su)進行對管道流(liu)體關閉(bi)，使故障(zhang)發生的(de)可能性(xing)降到低(di)點，使工作人員和設備裝(zhuang)置處于安全(quan)狀態。電動切斷(duan)閥屬(shu)于SIL級(ji)別確(que)定嚴格的(de)故障(zhang)及事故聯鎖裝(zhuang)置設備的(de)一部(bu)分。

   電動切斷閥在(zai)生產(chan)裝(zhuang)置(zhi)(zhi)從安(an)(an)(an)全(quan)(quan)角度(du)來講，可(ke)分為(wei)三(san)個(ge)(ge)層(ceng)次，第一層(ceng)為(wei)生產(chan)過程(cheng)層(ceng)；第二(er)層(ceng)為(wei)過程(cheng)控(kong)制(zhi)層(ceng)；第三(san)層(ceng)為(wei)安(an)(an)(an)全(quan)(quan)儀(yi)表系(xi)(xi)統(tong)停(ting)車(che)保(bao)護(hu)層(ceng)。生產(chan)裝(zhuang)置(zhi)(zhi)在(zai)初期的(de)(de)工程(cheng)設(she)(she)計、設(she)(she)備選型及安(an)(an)(an)裝(zhuang)階段，都對過程(cheng)和(he)設(she)(she)備的(de)(de)安(an)(an)(an)全(quan)(quan)性進行了(le)考(kao)慮(lv)，因此(ci)裝(zhuang)置(zhi)(zhi)本身就構成了(le)安(an)(an)(an)全(quan)(quan)的(de)(de)第一道防(fang)線(xian)。采(cai)用(yong)用(yong)控(kong)制(zhi)系(xi)(xi)統(tong)對過程(cheng)進行連續動態控(kong)制(zhi)，使裝(zhuang)置(zhi)(zhi)在(zai)設(she)(she)定值下平穩(wen)運行，而且將裝(zhuang)置(zhi)(zhi)的(de)(de)風(feng)險又(you)降低(di)了(le)一個(ge)(ge)等級，是安(an)(an)(an)全(quan)(quan)的(de)(de)第二(er)道防(fang)線(xian)。在(zai)過程(cheng)之上(shang)要設(she)(she)置(zhi)(zhi)一套(tao)安(an)(an)(an)全(quan)(quan)儀(yi)表系(xi)(xi)統(tong)，對過程(cheng)進行監測和(he)保(bao)護(hu)，把(ba)可(ke)能發生意外事故(gu)的(de)(de)可(ke)能性降到低(di)點，較大(da)限度(du)地(di)保(bao)護(hu)生產(chan)裝(zhuang)置(zhi)(zhi)和(he)人身安(an)(an)(an)全(quan)(quan)，避免(mian)事故(gu)的(de)(de)發生，構成了(le)生產(chan)裝(zhuang)置(zhi)(zhi)穩(wen)固、關鍵的(de)(de)第三(san)道防(fang)線(xian)。因此(ci)SIS與DCS在(zai)生產(chan)過程(cheng)中所起的(de)(de)作用(yong)是至關重要的(de)(de)。

   電動切斷閥 Electric cut-off valve屬于電動閥門 Electric valve系列下電動球閥 Electric ball valve類型，采用防爆角行程執行器與防火防靜電O型球閥 Ball valve組成，以380V/220V/110V交流電源或者24V直流電源為驅動電源，以4-20mA電流信號或0-10V DC電壓信號為控制信號，可使閥門運動到所需位置，實現其自動化遠程開關控制。
   電動(dong)(dong)緊(jin)急切斷閥執(zhi)行(xing)器(qi)(qi)(qi)為硬質(zhi)鋁合(he)金(jin)，經(jing)陽極氧化處理和(he)聚酯粉末涂層，耐腐(fu)蝕性強，防護等級(ji)(ji)為IP67，防爆等級(ji)(ji)：Exd Ⅱ BT4,Exd Ⅱ CT5。全封閉(bi)式鼠籠式電機(ji)，體積(ji)小(xiao)，扭矩大(da)，慣性力小(xiao)，絕緣(yuan)等級(ji)(ji)為F級(ji)(ji)，內置過熱保護開關，可防止損(sun)壞電機(ji)。手(shou)輪的設計保證安全可靠、省力、體積(ji)小(xiao)。不通(tong)(tong)電時(shi)(shi)，扳(ban)動(dong)(dong)離合(he)器(qi)(qi)(qi)手(shou)柄(bing)可進(jin)行(xing)手(shou)動(dong)(dong)操作。通(tong)(tong)電時(shi)(shi)，離合(he)器(qi)(qi)(qi)自動(dong)(dong)復(fu)位。控制線路符合(he)單相(xiang)(xiang)或三相(xiang)(xiang)電源標(biao)準，線路布置緊(jin)湊合(he)理，接(jie)線端(duan)子可有效(xiao)滿足各種附加(jia)功能的要求(qiu)。

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