河南鋼廠真空管道蝶閥重量頂耕國(guó)際貿(mào)易供應(yīng)-b2b網(wǎng)站_b2b電子商務(wù)平臺(tái)【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content=" 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(shí)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(shí)驗(yàn)表明,閥門密"><meta name="keywords" content="河南鋼廠真空管道蝶閥重量"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta 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href="http://www.cdcfah.com/cp/third-famenti_diefakna/">蝶閥</a>?河南鋼廠真空管道蝶閥重量頂耕國(guó)際貿(mào)易供應(yīng)</p><div id="kxtf3kz" class="leftbox clearfix"><h1>河南鋼廠真空管道蝶閥重量頂耕國(guó)際貿(mào)易供應(yīng)</h1><div id="mp8dkb3" class="proBig"><div id="gpp3you" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129749328144532/3165155.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="nryp3zv" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129749328144532/3165155.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="leahvkw" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>河南鋼廠真空管道蝶閥重量</p><p><span>***更新：</span>2020-06-07 14:13:50</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="83td3yf" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">頂耕國(guó)際貿(mào)易（上海）有限公司</a></p><p><span>聯(lián)系人：</span>查劍來(lái)</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(jī): </span>021-61637356</p><p><span>地址: </span>大葉公路5225號(hào)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="vdzvyp3" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="mevm3h8" 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。在閥門密封面材料選用時(shí)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(shí)驗(yàn)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?shī)W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(jià)格高其性能就好。材料的價(jià)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(lái)源于進(jìn)口,價(jià)格較高,因而鈷基合金材料價(jià)格就高，河南鋼廠真空管道蝶閥重量。鈷基合金的特點(diǎn)是高溫耐磨性能好,而用在常溫，河南鋼廠真空管道蝶閥重量、中溫工況,則價(jià)格/性能比較高。在閥門密封面材料選用時(shí)應(yīng)選擇價(jià)格/性能比較低的材料。誤區(qū)3:閥門密封面材料在某一強(qiáng)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(jī)理,一種材料在某一強(qiáng)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(duì)另一種腐蝕性介質(zhì)，河南鋼廠真空管道蝶閥重量,其耐蝕性能變化更大。金屬材料的耐腐蝕性只能通過(guò)實(shí)驗(yàn)得知。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南鋼廠真空管道蝶閥重量" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129749328144532/3165155.png"></div><p> 什么情況下需要采用閥門定位器？ </p> <p> <br /> </p> <p> 1）摩擦力大，需精確定位的場(chǎng)合。例如高溫、低溫調(diào)節(jié)閥或采用柔性石墨填料的調(diào)節(jié)閥； </p> <p> 2）緩慢過(guò)程需提高調(diào)節(jié)閥響應(yīng)速度的場(chǎng)合。例如，溫度、液位、分析等參數(shù)的調(diào)節(jié)系統(tǒng)。 </p> <p> 3）需要提高執(zhí)行機(jī)構(gòu)輸出力和切斷力的場(chǎng)合。例如，DN≥25的單座閥，DN＞100的雙座閥。閥兩端壓降△P＞1MPa或入口壓力P1＞10MPa的場(chǎng)合。 </p> <p> 4）分程調(diào)節(jié)系統(tǒng)和調(diào)節(jié)閥運(yùn)行中有時(shí)需要改變氣開、氣關(guān)形式的場(chǎng)合。 </p> <p> 5）需要改變調(diào)節(jié)閥流量特性的場(chǎng)合。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南鋼廠真空管道蝶閥重量" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737890810547/4528489.jpg"></div><p> 低泄漏閥門是指閥門實(shí)際泄漏量很小，靠常規(guī)的水壓、氣壓密封試驗(yàn)已不能判定，需要借助更加先進(jìn)的手段和儀器來(lái)檢測(cè)的微小外泄漏。目前國(guó)際上比較常用的檢測(cè)閥門低泄漏的標(biāo)準(zhǔn)主要有以下三種： </p> <p> <br /> </p> <p> (1)美國(guó)環(huán)境保護(hù)署EPA method 21《揮發(fā)性有機(jī)組分泄漏檢測(cè)》。 </p> <p> <br /> </p> <p> (2)國(guó)際標(biāo)準(zhǔn)化組織ISO 15848(工業(yè)閥門：低泄漏測(cè)量、試驗(yàn)及資格認(rèn)定程序》。 </p> <p> <br /> </p> <p> (3)殼牌石油公司SHELL MESC SPE 77／312《工業(yè)閥門：低泄漏測(cè)量、分級(jí)系統(tǒng)、資格認(rèn)定程序及開關(guān)閥和控制閥的型式認(rèn)可和產(chǎn)品試驗(yàn)》。 </p> <p> <br /> </p> <p> 美國(guó)環(huán)境保護(hù)署EPA Method 21標(biāo)準(zhǔn)*規(guī)定了檢測(cè)方法而沒有泄漏等級(jí)的劃分，屬于地方性標(biāo)準(zhǔn)法規(guī)，應(yīng)用較少。國(guó)際標(biāo)準(zhǔn)化組織ISO 15848和殼牌石油公司SHELL MESC SPE 77／312這兩個(gè)標(biāo)準(zhǔn)，對(duì)于閥門的性能，都從緊密等級(jí)、耐久等級(jí)和溫度等級(jí)三個(gè)方面進(jìn)行評(píng)定。緊密等級(jí)針對(duì)閥桿和閥體密封處的泄漏，分為A，B，C三個(gè)等級(jí)，對(duì)于ISO 15848標(biāo)準(zhǔn)閥體密封處的泄漏要求≤50 em3／m3，而閥桿處的泄漏兩個(gè)標(biāo)準(zhǔn)均是按照閥桿的直徑計(jì)算的。 </p> <p> <br /> </p> <p> ISO 15848A級(jí)密封等級(jí)比較高，B，c級(jí)密封等級(jí)同SHELLMESC SPE 77／312標(biāo)準(zhǔn)。通常低泄漏閥門的密封等級(jí)低于B級(jí)，而波紋管密封閥門由于在閥桿密封部位采用金屬波紋管密封，其密封等級(jí)低于A級(jí)。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南鋼廠真空管道蝶閥重量" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129736101689453/4021167.png"></div></p><br /><p>文章來(lái)源地址: 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