分別介紹FESTO電磁閥的(de)結構(gou)原理(li)以及技術(shu)特點
壓(ya)力設定(ding)值(zhi)在(zai)運(yun)行期(qi)間可(ke)連續設定(ding)。但在(zai)使(shi)(shi)用(yong)過程(cheng)中(zhong),一定(ding)要(yao)注(zhu)意(yi)選(xuan)型(xing)的(de)(de)特(te)殊(shu)性,否則容(rong)易引(yin)起事故。在(zai)使(shi)(shi)用(yong)過程(cheng)中(zhong),要(yao)注(zhu)意(yi)使(shi)(shi)用(yong)的(de)(de)選(xuan)型(xing)和(he)安裝環境,因此(ci),詳細(xi)了解自力式壓(ya)力調節閥的(de)(de)工作原理和(he)結構是非常重要(yao)的(de)(de)。
1、用(yong)途和適用(yong)范圍(wei)
自力式壓(ya)(ya)力調節閥(以下(xia)簡稱壓(ya)(ya)力閥)是(shi)一(yi)種無需外來能源而只依(yi)靠調介質(zhi)自身的(de)(de)壓(ya)(ya)力變化(hua)進行自動調節壓(ya)(ya)力的(de)(de)節能型(xing)產品(pin).具有測量、執行、控(kong)制(zhi)的(de)(de)綜合功(gong)能。廣泛適用(yong)于石油(you)、化(hua)工、冶金(jin)、輕(qing)工等(deng)工業(ye)部(bu)門及城市供熱、供噯系(xi)統。本產品(pin)可(ke)用(yong)于非腐蝕性(好(hao)高溫度350℃)的(de)(de)液體(ti)、氣體(ti)和蒸汽(qi)等(deng)介質(zhi)的(de)(de)壓(ya)(ya)力控(kong)制(zhi)裝置。
2、結構及(ji)工作原理(li)
工藝介質的(de)(de)閥(fa)(fa)前壓力(li)Pl經過閥(fa)(fa)芯、閥(fa)(fa)座(zuo)的(de)(de)節流后(hou),變(bian)(bian)為閥(fa)(fa)后(hou)壓力(li)P2。P2經過控制管(guan)線輸入(ru)執行器的(de)(de)下(xia)膜室作(zuo)(zuo)用(yong)(yong)(yong)(yong)在頂盤上(shang)(shang).產生(sheng)的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)與(yu)彈簧(huang)的(de)(de)反作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)相(xiang)平衡.決定了閥(fa)(fa)芯、閥(fa)(fa)座(zuo)的(de)(de)相(xiang)對(dui)位(wei)置.控制閥(fa)(fa)后(hou)壓力(li)。當閥(fa)(fa)后(hou)壓力(li)P2增加時(shi).P2作(zuo)(zuo)用(yong)(yong)(yong)(yong)在頂盤上(shang)(shang)的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)也隨之增加。此(ci)時(shi).頂盤的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)大于(yu)彈簧(huang)的(de)(de)反作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li).使閥(fa)(fa)芯關向閥(fa)(fa)座(zuo)的(de)(de)位(wei)置.直(zhi)到頂盤的(de)(de)作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)與(yu)彈簧(huang)反作(zuo)(zuo)用(yong)(yong)(yong)(yong)力(li)相(xiang)平衡為止(zhi)。這(zhe)時(shi).閥(fa)(fa)芯與(yu)閥(fa)(fa)座(zuo)之間的(de)(de)流通(tong)面積(ji)減少(shao).流阻變(bian)(bian)大.從(cong)而使P2降為設(she)定值。同理,當閥(fa)(fa)后(hou)壓力(li)P2降低時(shi).作(zuo)(zuo)用(yong)(yong)(yong)(yong)方向與(yu)上(shang)(shang)述相(xiang)反.這(zhe)就(jiu)是閥(fa)(fa)后(hou)壓力(li)調節時(shi)的(de)(de)工作(zuo)(zuo)原理。當需要改(gai)變(bian)(bian)閥(fa)(fa)后(hou)壓力(li)P2的(de)(de)設(she)定值時(shi).可調整調節螺母8。
3、技術特點(dian):
自力式壓(ya)力調(diao)(diao)節閥是不需要任(ren)何外加(jia)能(neng)源(yuan),利用被調(diao)(diao)介(jie)質(zhi)自身(shen)能(neng)量而實(shi)現自動調(diao)(diao)節的執(zhi)行(xing)器產品(pin)。該(gai)產品(pin)好特(te)點,能(neng)在無電、無氣的場所工(gong)作(zuo),同時又節約了能(neng)源(yuan),壓(ya)力設(she)定值(zhi)在運行(xing)中可隨意調(diao)(diao)整。采(cai)用快開(kai)流量特(te)征,動作(zuo)靈敏、密封性能(neng)好,因而它廣泛應用于(yu)石油(you)、化工(gong)、電力、冶金、食品(pin)、輕紡等各種工(gong)業(ye)設(she)備中氣體、液體、蒸汽介(jie)質(zhi)減(jian)壓(ya)、泄壓(ya)、穩壓(ya)。
1、纏繞(rao)式墊(dian)片(pian)
在閥(fa)門鏈接中(zhong)(zhong),使(shi)用纏繞式墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)讓法蘭(lan)沒有間隙(xi),可能外表上看(kan)起來有間隙(xi),但實際是(shi)沒有間隙(xi)的(de)(de)(de)(de)(de)(de)。纏繞式墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)密封作用是(shi)利用閥(fa)體止(zhi)口深(shen)度(du)(du)控(kong)(kong)(kong)翩墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)壓(ya)(ya)縮量(liang)(liang)而(er)實現的(de)(de)(de)(de)(de)(de)。纏繞式墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)壓(ya)(ya)縮量(liang)(liang)一般為在壓(ya)(ya)緊墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)結(jie)構(gou)設計(ji)中(zhong)(zhong),纏繞式墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)厚(hou)度(du)(du)高出閥(fa)體止(zhi)口深(shen)度(du)(du)當(dang)中(zhong)(zhong)法蘭(lan)兩平(ping)面靠緊后,此時墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)壓(ya)(ya)綰量(liang)(liang)即在規(gui)定范圍(wei)內。在工況條件下,隨溫度(du)(du)的(de)(de)(de)(de)(de)(de)變(bian)(bian)化(hua),由螺(luo)栓(shuan)伸(shen)長而(er)減小(xiao)的(de)(de)(de)(de)(de)(de)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)處密封比(bi)壓(ya)(ya),可以靠墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)回(hui)(hui)彈性(xing)(xing)(xing)來補(bu)償(chang),從而(er)保(bao)證中(zhong)(zhong)法蘭(lan)墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)處不發生泄漏墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)壓(ya)(ya)縮量(liang)(liang)也可用螺(luo)栓(shuan)旋(xuan)(xuan)緊力(li)控(kong)(kong)(kong)制,其目的(de)(de)(de)(de)(de)(de)是(shi)既要(yao)保(bao)證墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)處有足夠(gou)的(de)(de)(de)(de)(de)(de)密封比(bi)壓(ya)(ya)又(you)不至過載(zai),以便保(bao)證墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)回(hui)(hui)彈性(xing)(xing)(xing)。如果(guo)不控(kong)(kong)(kong)制螺(luo)栓(shuan)的(de)(de)(de)(de)(de)(de)旋(xuan)(xuan)緊力(li),并其力(li)過大時,墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)會因塑性(xing)(xing)(xing)變(bian)(bian)形而(er)失去回(hui)(hui)彈性(xing)(xing)(xing),甚至破壞墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)結(jie)構(gou)。采用控(kong)(kong)(kong)制螺(luo)栓(shuan)旋(xuan)(xuan)緊力(li)的(de)(de)(de)(de)(de)(de)方法來控(kong)(kong)(kong)制墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)的(de)(de)(de)(de)(de)(de)壓(ya)(ya)綰量(liang)(liang),在結(jie)構(gou)設計(ji)上就(jiu)可以給纏繞式墊(dian)(dian)(dian)(dian)(dian)片(pian)(pian)(pian)以較大的(de)(de)(de)(de)(de)(de)變(bian)(bian)形自由度(du)(du).這種結(jie)構(gou)的(de)(de)(de)(de)(de)(de)中(zhong)(zhong)法蘭(lan)可有間隙(xi)。
2、金(jin)屬波形墊(dian)片
金屬波(bo)(bo)形(xing)墊片(pian)由(you)(you)厚度(du)約0.8mm的軟鋼(gang)經(jing)沖壓或滾壓于墊片(pian)表面(mian)并(bing)形(xing)成波(bo)(bo)紋形(xing)。墊片(pian)被壓緊后(hou),由(you)(you)波(bo)(bo)峰的變形(xing)而使(shi)中(zhong)法(fa)(fa)蘭(lan)達到密封(feng)。由(you)(you)于墊片(pian)很薄,變形(xing)后(hou)其(qi)厚度(du)僅0.5mm為(wei)左右,所以看(kan)不(bu)到法(fa)(fa)蘭(lan)有明顯的間隙,基本上屬于體'無問隙
3、柔性石墨復(fu)合墊(dian)片
柔性石墨(mo)復合墊(dian)(dian)片的(de)(de)(de)中(zhong)(zhong)間為0.5mm厚的(de)(de)(de)碳鋼板(ban)或不(bu)銹鋼板(ban),鋼板(ban)的(de)(de)(de)上(shang)下面有(you)柔性石墨(mo)層覆蓋,總厚度約為0.3mm.這(zhe)種墊(dian)(dian)片壓縮后有(you)一(yi)定的(de)(de)(de)回彈性,且不(bu)會因(yin)為壓緊力過大而導致墊(dian)(dian)片的(de)(de)(de)破壞(huai),所(suo)以中(zhong)(zhong)法(fa)蘭(lan)存有(you)一(yi)定的(de)(de)(de)間隙。
FESTO電磁閥(fa)是由氣動(dong)執行器和蝶(die)閥(fa)組(zu)成。FESTO電磁閥(fa)閥(fa)是用(yong)隨閥(fa)柑轉動(dong)的圓形蝶(die)板(ban)做啟閉性,以實現啟用(yong)動(dong)作(zuo)的氣動(dong)閥(fa)門主要做截斷閥(fa)使(shi)用(yong),亦(yi)可設計成具有調節或段閥(fa)兼調節的功能,目前蝶(die)閥(fa)在低壓大中口徑管道上的使(shi)用(yong)越來越多。
FESTO電磁閥(fa)是管路系統及流(liu)體工程中常用(yong)的氣動閥(fa)門(men)之一,通常是由閥(fa)門(men)氣動執(zhi)行器和(he)蝶閥(fa)組成(cheng),它具有如(ru)下特點:
1、小巧(qiao)輕(qing)便,容易拆裝(zhuang)及維修,并(bing)可在任意位置安裝(zhuang)。
2、結構簡單、緊湊,操作扭矩小(xiao),90°回轉開啟(qi)迅速。
3、FESTO電(dian)磁閥(fa)流量特性趨直線,調節性能好。
4、FESTO電磁閥蝶板與閥桿的連接采用無銷釘結(jie)構(gou),克服了有可能的內泄漏點。
5、FESTO電磁(ci)閥外(wai)圓采用球面(mian)造(zao)型,提高了密封性能及延長了閥門(men)的使用壽命,帶壓啟閉5萬次以上仍保持零泄漏。
6、密(mi)封件可更換,且密(mi)封可靠達到雙向密(mi)封。
7、FESTO電磁(ci)閥可根據用戶要求(qiu)噴涂覆層,如尼龍或(huo)聚四氟(fu)類。
8、該閥可設計(ji)成法蘭連接和對夾連接。
9、驅(qu)動(dong)(dong)(dong)方式可選擇手動(dong)(dong)(dong)、電動(dong)(dong)(dong)或氣動(dong)(dong)(dong)執行(xing)器驅(qu)動(dong)(dong)(dong)。
FESTO電磁閥的(de)維護在(zai)以下幾個方面:
1、FESTO電磁閥使用前(qian)應確(que)認閥全開的(de)前(qian)提(ti)下對管道進行沖破洗,以免(mian)有焊渣等雜物刮傷密封面。
2、FESTO電磁(ci)閥一般都設置旁通管(guan)路,在(zai)檢修(xiu)或更換(huan)氣動蝶閥時(shi),可使(shi)用(yong)旁通管(guan)路使(shi)用(yong)流程(cheng)照(zhao)常進(jin)行。
3、FESTO電(dian)磁閥可在水平180°范圍(wei)內豎臥安裝(zhuang),切勿將(jiang)氣動執行器朝下倒裝(zhuang)。
4、氣動(dong)執行(xing)器(qi)曲臂(bei)為方頭結(jie)構,用為手動(dong)裝置使用,故障時(shi)卸掉氣源管直(zhi)接(jie)用手動(dong)扳手即可(ke)實現手動(dong)操作(zuo)。
5、使用(yong)過(guo)程(cheng)中如發現填(tian)料函(han)滲漏,緊固一(yi)下(xia)壓蓋螺栓即可解決。
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