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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>安徽鋼廠真空管道蝶閥口徑</p><p><span>***更新：</span>2020-05-24 13:29:11</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="guh794k" 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="zdf3oh2" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="eszlszi" class="box"><p><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)，安徽鋼廠真空管道蝶閥口徑、資格認(rèn)定程序及開(kāi)關(guān)閥和控制閥的型式認(rèn)可和產(chǎn)品試驗(yàn)》，安徽鋼廠真空管道蝶閥口徑，安徽鋼廠真空管道蝶閥口徑。 </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(méi)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="安徽鋼廠真空管道蝶閥口徑" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737494101563/8647630.png"></div><p> 五金真空閥門是在真空系統(tǒng)中，用來(lái)改變氣流方向，調(diào)節(jié)氣流量大小，切斷或接通管路的真空系統(tǒng)元件稱為真空閥門。下面對(duì)真空閥門進(jìn)行簡(jiǎn)要介紹：高真空插板閥驅(qū)動(dòng)裝置可放置在側(cè)面通常插板閥的高度較高，有占設(shè)備高度空間大的缺點(diǎn)。為了克服這個(gè)缺點(diǎn)我們將驅(qū)動(dòng)裝置設(shè)計(jì)在側(cè)面，這樣**地縮短了閥門的高度尺寸，減少了設(shè)備空間的制造成本。高真空蝶閥采用高平臺(tái)設(shè)計(jì)一般氣動(dòng)、電動(dòng)高真空蝶閥采用的是支架/連接套的安裝方式，我公司科學(xué)設(shè)計(jì)的直接安裝高平臺(tái)，使安裝執(zhí)行器變簡(jiǎn)單。小口徑高真空擋板閥閥體均為精密鑄件高科技的精密鑄造工藝和設(shè)備，使得不銹鋼鑄件完全能夠獲得致密的**結(jié)構(gòu)。完全沒(méi)有“氣孔、疏松、夾砂”等鑄造缺點(diǎn)。外形整潔、美觀。閥體漏率指標(biāo)優(yōu)于。完全適用于超高真空工況條件。GYC-JQ系列電磁高真空壓差式充氣閥的防止返油性能得到**提升經(jīng)過(guò)對(duì)高真空壓差式充氣閥的結(jié)構(gòu)進(jìn)行改進(jìn)，使得產(chǎn)品性能更加可靠，更適合機(jī)械真空泵工況要求。有以下三個(gè)關(guān)鍵能性得到了提升：(1).關(guān)閥時(shí)間縮短到<，更有利于防止返油;(2).開(kāi)閥時(shí)間稍有延時(shí),只有真空度達(dá)到了一定的值后閥門才能開(kāi)啟，如果無(wú)壓差時(shí)則回到常開(kāi)的狀態(tài);(3).產(chǎn)品的真空漏率指標(biāo)得到提高。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="安徽鋼廠真空管道蝶閥口徑" src="https://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737718496094/8657721.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(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(méi)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。鈷基合金的特點(diǎn)是高溫耐磨性能好,而用在常溫、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),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="安徽鋼廠真空管道蝶閥口徑" src="https://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737494189453/4103674.png"></div></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/28479.html</p></div></div></div></div></div><div id="3ofh2fd" class="page-right twoColRt"><div id="lfwdefm" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="y22prdu" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)</p></a></div><div id="334neqx" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img src="https://tyunfile.71360.com/WaterMark/UploadFile/nbzxsw/637298235378037109/764794.png" alt="寧波寧海直接考A2有幾個(gè)科目真誠(chéng)推薦寧波助學(xué)商務(wù)信息咨詢供應(yīng)" class="vcenter" 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