不銹鋼蝶型止回閥介紹：

止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)主要(yao)是(shi)(shi)(shi)(shi)(shi)用(yong)(yong)來(lai)防止(zhi)(zhi)(zhi)(zhi)(zhi)管道中(zhong)的(de)(de)介(jie)質(zhi)(zhi)(zhi)倒流使(shi)(shi)用(yong)(yong)。底閥(fa)及鴨嘴閥(fa)也是(shi)(shi)(shi)(shi)(shi)屬于(yu)(yu)止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)系(xi)類。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)可(ke)分為(wei)(wei)升降(jiang)式(shi)(shi)、旋(xuan)(xuan)啟(qi)式(shi)(shi)、蝶型三種。升降(jiang)式(shi)(shi)又(you)可(ke)分為(wei)(wei)立(li)式(shi)(shi)和(he)臥式(shi)(shi)兩(liang)種，升降(jiang)式(shi)(shi)結構是(shi)(shi)(shi)(shi)(shi)沿軸(zhou)線移動(dong)(dong)(dong)(dong)(dong)。旋(xuan)(xuan)啟(qi)式(shi)(shi)還(huan)可(ke)分為(wei)(wei)單瓣(ban)(ban)式(shi)(shi)、雙瓣(ban)(ban)式(shi)(shi)和(he)多瓣(ban)(ban)式(shi)(shi)三種，旋(xuan)(xuan)啟(qi)式(shi)(shi)結構是(shi)(shi)(shi)(shi)(shi)依(yi)重心旋(xuan)(xuan)轉。蝶型結構為(wei)(wei)直通流道。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)的(de)(de)啟(qi)閉(bi)是(shi)(shi)(shi)(shi)(shi)依(yi)靠介(jie)質(zhi)(zhi)(zhi)流動(dong)(dong)(dong)(dong)(dong)力(li)(li)量自行開啟(qi)和(he)關閉(bi)。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)屬于(yu)(yu)自動(dong)(dong)(dong)(dong)(dong)閥(fa)產(chan)品(pin)，止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)只(zhi)允許介(jie)質(zhi)(zhi)(zhi)向(xiang)一個方向(xiang)流動(dong)(dong)(dong)(dong)(dong)的(de)(de)管路中(zhong)使(shi)(shi)用(yong)(yong)，防止(zhi)(zhi)(zhi)(zhi)(zhi)介(jie)質(zhi)(zhi)(zhi)回(hui)流的(de)(de)現象發生。其(qi)使(shi)(shi)用(yong)(yong)范(fan)圍很廣，可(ke)適用(yong)(yong)大(da)小口徑、各種介(jie)質(zhi)(zhi)(zhi)、電站(zhan)高壓(ya)(ya)系(xi)統中(zhong)使(shi)(shi)用(yong)(yong)。止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)開啟(qi)是(shi)(shi)(shi)(shi)(shi)指(zhi)依(yi)靠介(jie)質(zhi)(zhi)(zhi)正向(xiang)流動(dong)(dong)(dong)(dong)(dong)打開閥(fa)瓣(ban)(ban)，同(tong)(tong)樣的(de)(de)道理(li)介(jie)質(zhi)(zhi)(zhi)倒流推動(dong)(dong)(dong)(dong)(dong)閥(fa)瓣(ban)(ban)而(er)關閉(bi)，止(zhi)(zhi)(zhi)(zhi)(zhi)回(hui)閥(fa)還(huan)稱(cheng)之為(wei)(wei)逆止(zhi)(zhi)(zhi)(zhi)(zhi)閥(fa)、單向(xiang)閥(fa)、逆流閥(fa)、和(he)背(bei)壓(ya)(ya)閥(fa)等。多屬于(yu)(yu)自動(dong)(dong)(dong)(dong)(dong)閥(fa)門，主要(yao)功(gong)能(neng)是(shi)(shi)(shi)(shi)(shi)用(yong)(yong)來(lai)防止(zhi)(zhi)(zhi)(zhi)(zhi)介(jie)質(zhi)(zhi)(zhi)倒流，防止(zhi)(zhi)(zhi)(zhi)(zhi)泵及驅動(dong)(dong)(dong)(dong)(dong)電動(dong)(dong)(dong)(dong)(dong)機反(fan)轉和(he)容器介(jie)質(zhi)(zhi)(zhi)的(de)(de)泄放使(shi)(shi)用(yong)(yong)。同(tong)(tong)時(shi)還(huan)用(yong)(yong)于(yu)(yu)壓(ya)(ya)力(li)(li)可(ke)能(neng)升至超過系(xi)統壓(ya)(ya)的(de)(de)輔(fu)助(zhu)系(xi)統中(zhong)作為(wei)(wei)安(an)全(quan)保護。

不銹鋼蝶型止回閥技術參數：
壓力等級：PN1.0-320MPa、日級10-63K、核電級：150LB-2500LB；
通用尺寸：DN15-1500mm、NPS 1/4-36 ''；
連接形式：內螺紋、法蘭、對焊、承插焊等；
適用溫度：通用-80℃～425℃；電站級-196℃-580℃
主要材料：球墨鑄鐵、碳鋼、鉻鉬鋼、不銹鋼
材質介質：C：水、蒸汽、油品、P：硝酸、醋酸、R：氧化性介質、尿素等多種介質。

根據其結構和(he)安裝方式可分：

一、蝶(die)(die)式(shi)止(zhi)(zhi)回閥(fa)的閥(fa)瓣(ban)呈(cheng)圓盤狀(zhuang)，繞閥(fa)座通道(dao)的轉(zhuan)軸作旋轉(zhuan)運動(dong)，因閥(fa)內通道(dao)成流(liu)(liu)(liu)線型，流(liu)(liu)(liu)動(dong)阻力(li)比(bi)升蝶(die)(die)式(shi)止(zhi)(zhi)回閥(fa)小(xiao)，適用于低流(liu)(liu)(liu)速和流(liu)(liu)(liu)動(dong)不(bu)常變化的大(da)口徑(jing)場(chang)合，但不(bu)宜用于脈動(dong)流(liu)(liu)(liu)，其密封性(xing)能(neng)不(bu)及(ji)升降式(shi)。蝶(die)(die)式(shi)止(zhi)(zhi)回閥(fa)分單瓣(ban)式(shi)、雙瓣(ban)式(shi)和多瓣(ban)式(shi)三種，這三種形(xing)式(shi)主要按(an)閥(fa)門口徑(jing)來分，目的是為了防止(zhi)(zhi)介質停止(zhi)(zhi)流(liu)(liu)(liu)動(dong)或倒流(liu)(liu)(liu)時，減弱水力(li)沖擊(ji)。