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onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="dnfcrqh" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737896250000/4170655.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="wgd8h9q" 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>遼寧煉鋼廠真空管道蝶閥口徑</p><p><span>***更新：</span>2020-05-23 11:30:14</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="8lsp2q9" 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="e8tqf2v" class="page-proshow02"><p class="title">詳細說明</p><div id="8dkhtct" class="box"><p><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，遼寧煉鋼廠真空管道蝶閥口徑。在閥門密封面材料選用時應避免走入誤區(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，遼寧煉鋼廠真空管道蝶閥口徑,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,就一定適應其他腐蝕性介質(zhì)。金屬材料的耐腐蝕性有其復雜的機理,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)，遼寧煉鋼廠真空管道蝶閥口徑,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="遼寧煉鋼廠真空管道蝶閥口徑" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737896250000/4170655.jpg"></div><p> 主要分類 </p> <p> 按驅(qū)動方式分 </p> <p> (1)電動蝶閥 </p> <p> (2)氣動蝶閥 </p> <p> (3)液動蝶閥 </p> <p> (4)手動蝶閥 </p> <p> 按結(jié)構(gòu)形式分： </p> <p> (1)中心密封蝶閥 </p> <p> (2)單偏心密封蝶閥 </p> <p> (3)雙偏心密封蝶閥 </p> <p> (4)三偏心密封蝶閥 </p> <p> 密封面材質(zhì)分： </p> <p> (1)軟密封蝶閥。 </p> <p> 1)密封副由非金屬軟質(zhì)材料對非金屬軟質(zhì)材料構(gòu)成。 </p> <p> 2)密封副由金屬硬質(zhì)材料對非金屬軟質(zhì)材料構(gòu)成。 </p> <p> (2)金屬硬密封蝶閥。密封副由金屬硬質(zhì)材料對金屬硬質(zhì)材料構(gòu)成。 </p> <p> 按工作壓力分： </p> <p> (1)真空蝶閥。工作壓力低于標堆大氣壓的蝶閥。 </p> <p> (2)低壓蝶閥。公稱壓力PN<1．6MPa的蝶閥。 </p> <p> (3)中壓蝶閥。公稱壓力PN為2．5--6．4MPa的蝶閥。 </p> <p> (4)高壓蝶閥。公稱壓力PN為10.0--80．0MPa的蝶閥。 </p> <p> (5)超高壓蝶閥。公稱壓力PN>100MPa的蝶閥。 </p> <p> 按連接方式分： </p> <p> 1、對夾式蝶閥 </p> <p> 對夾式蝶閥的蝶板安裝于管道的直徑方向。閥門則呈全開狀態(tài)。 </p> <p> 對夾式蝶閥結(jié)構(gòu)簡單、體積小、重量輕。蝶閥有彈性密封和金屬密封兩種密封型式。彈性密封閥門，密封圈可以鑲嵌在閥體上或附在蝶板周邊。 </p> <p> 2、法蘭式蝶閥 </p> <p> 法蘭式蝶閥為垂直板式結(jié)構(gòu)，閥桿為整體式金屬硬密封閥門的密封圈 </p> <p> 為柔性石墨板與不銹鋼板復合式結(jié)構(gòu)，安裝在閥體上，蝶板密封面堆焊不銹鋼。軟密封閥門的密封圈為丁腈橡膠材質(zhì)，是安裝在蝶板上的。 </p> <p> 3、凸耳式蝶閥 </p> <p> 4、焊接式蝶閥 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="遼寧煉鋼廠真空管道蝶閥口徑" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129749327031250/8086057.png"></div><p> 閥體和閥蓋的泄漏原因：1、鑄鐵件鑄造質(zhì)量不高，閥體和閥蓋體上有砂眼、松散組織、夾渣等缺點；2、天冷凍裂；3、焊接不良，存在著夾渣、未焊接，應力裂紋等缺點；4、鑄鐵閥門被重物撞擊后損壞。維護方法：1、提高鑄造質(zhì)量，安裝前嚴格按規(guī)定進行強度試驗；2、對氣溫在0℃和0℃以下的閥門，應進行保溫或拌熱，停止使用的閥門應排除積水；3、由焊接組成的閥體和閥蓋的焊縫，應按有關(guān)焊接操作規(guī)程進行，焊后還應進行探傷和強度試驗；4、閥門上禁止推放重物，不允許用手錘撞擊鑄鐵和非金屬閥門，大口徑閥門的安裝應有支架。填料處的泄露閥門的外漏，填料處占的比例為比較大。原因：1、填料選用不對，不耐介質(zhì)的腐蝕，不耐閥門高壓或真空、高溫或低溫的使用；2、填料安裝不對，存在著以小代大、螺旋盤繞接頭不良、上緊下松等缺點；3、填料超過使用期，已老化，喪失彈性；4、閥桿精度不高，有彎曲、腐蝕、磨損等缺點；5、填料圈數(shù)不足，壓蓋未壓緊；6、壓蓋、螺栓、和其他部件損壞，使壓蓋無法壓緊；7、操作不當，用力過猛等；8、壓蓋歪斜，壓蓋與閥桿間空隙過小或過大，致使閥桿磨損，填料損壞。維護方法：1、應按工況條件選用填料的材料和型式；2、按有關(guān)規(guī)定正確的安裝填料。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" 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