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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="jyah2tf" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>山西德國真空管道蝶閥泄露</p><p><span>***更新：</span>2020-05-23 13:29:53</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="cwdfzbd" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">頂耕國際貿(mào)易（上海）有限公司</a></p><p><span>聯(lián)系人：</span>查劍來</p><p><span>郵箱: </span></p><p><span>電話: </span>18521036598</p><p><span>傳真: </span>021_61637356</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>021-61637356</p><p><span>地址: </span>大葉公路5225號1幢2370室</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="8lx3hmy" class="page-proshow02"><p class="title">詳細說明</p><div id="fpro232" class="box"><p><p> 對于易燃易爆、0或有放射的介質(zhì)，外漏更是不能允許的，因而閥門必須具有可靠的密封性能。如何解決密封問題不成輕忽，閥門跑、冒、滴、漏現(xiàn)象，盡年夜部門發(fā)生這里，山西德國真空管道蝶閥泄露。下面我們將計議閥門動密封、靜密封問題。1動密封閥門動密封，主指閥桿密封。不讓閥內(nèi)介質(zhì)隨閥桿運動而泄漏，是閥門動密封中心課題。1)填料函形式閥門動密封，以填料函為主。填料函基本形式是：(1)壓蓋式這是用**多形式。統(tǒng)一形式又能許多細節(jié)區(qū)分。例如，從壓緊螺栓來說，可分T形螺栓(用于壓力≤16千克/平方厘米低壓閥門)、雙頭螺栓和活節(jié)螺栓等。從壓蓋來說，可分整體式和組合式。(2)壓緊螺母式這類形式，外形尺寸小，但壓緊力受限制，只使用于小閥門。2)填料填料函內(nèi)，以填料與閥桿直接接觸并布滿填料函，阻止介質(zhì)外漏。對填料有以下要求：(1)密封性好；(2)耐侵蝕；(3)磨擦系數(shù)?。?4)順應(yīng)介質(zhì)溫度和壓力。經(jīng)常使用填料有：(1)石棉盤根：石棉盤根，耐溫文耐侵蝕性能都很好，但零丁使用時，密封效果欠安，總是浸漬或附加其他材料。油浸石棉盤根：它基本結(jié)構(gòu)形式有兩種，一種是扭制，另外一種是編結(jié)，山西德國真空管道蝶閥泄露，山西德國真空管道蝶閥泄露。又可分圓形和方形。(2)聚四氟乙烯編織盤根：將聚四氟乙烯細帶編織為盤根，有極好耐侵蝕性能。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西德國真空管道蝶閥泄露" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737890507813/9234469.jpg"></div><p> 其質(zhì)量直接影響閥門的使用壽命。合理地選擇閥門密封面的材料是提高閥門使用壽命的重要途徑之一。在閥門密封面材料選用時應(yīng)避免走入誤區(qū)。誤區(qū)1:閥門密封面材料的硬度高其耐磨損性能就好。實驗表明,閥門密封面材料的耐磨損性能是由其金屬材料的組織結(jié)構(gòu)所決定的。有些以奧氏體為基體加少量硬質(zhì)相結(jié)構(gòu)的金屬材料其硬度并不很高,但其耐磨損性能很好。閥門密封面具有一定的高硬度是為避免被介質(zhì)中硬雜物墊傷和劃傷。綜合考慮,硬度值HRC35~45為宜。誤區(qū)2:閥門密封面材料的價格高其性能就好。材料的價格是其本身的商品特性,而材料的使用性能是其物理特性,兩者沒有必然聯(lián)系。鈷基合金中金屬鈷來源于進口,價格較高,因而鈷基合金材料價格就高。鈷基合金的特點是高溫耐磨性能好,而用在常溫、中溫工況,則價格/性能比較高。在閥門密封面材料選用時應(yīng)選擇價格/性能比較低的材料。誤區(qū)3:閥門密封面材料在某一強腐蝕性介質(zhì)中耐蝕性良好,就一定適應(yīng)其他腐蝕性介質(zhì)。金屬材料的耐腐蝕性有其復(fù)雜的機理,一種材料在某一強腐蝕介質(zhì)中耐蝕性能良好,而條件稍有變化,如溫度或介質(zhì)濃度等改變,則耐蝕性能即改變。對另一種腐蝕性介質(zhì),其耐蝕性能變化更大。金屬材料的耐腐蝕性只能通過實驗得知。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西德國真空管道蝶閥泄露" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737493554688/8379117.png"></div><p> 金屬硬密封蝶閥作為一種用來實現(xiàn)管路系統(tǒng)通斷及流量控制的部件，已在石油、化工、冶金、水電等許多領(lǐng)域中得到極為很多地應(yīng)用。在已公知的蝶閥技術(shù)中，其密封形式多采用密封結(jié)構(gòu)，密封材料為橡膠、聚四氟乙烯等。由于結(jié)構(gòu)特征的限制，不適應(yīng)耐高溫、高壓及耐腐蝕、抗磨損等行業(yè)?，F(xiàn)有一種比較先進的蝶閥是三偏心金屬硬密封蝶閥，閥體和閥座為連體構(gòu)件，閥座密封表面層堆焊耐溫、耐蝕合金材料。多層軟疊式密封圈固定在閥板上，這種蝶閥與傳統(tǒng)蝶閥相比具有耐高溫，操作輕便，啟閉無磨擦，關(guān)閉時隨著傳動機構(gòu)的力矩增大來補償密封，提高了蝶閥的密封性能及延長使用壽命的優(yōu)點。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="山西德國真空管道蝶閥泄露" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737494296875/9390800.png"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/18643.html</p></div></div></div></div></div><div id="nryv49p" class="page-right twoColRt"><div id="isz22w8" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="xwyf4xl" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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