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class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737496894532/5616452.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="wqwdkgc" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737496894532/5616452.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ih3ljkb" 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>河南進(jìn)口真空管道蝶閥廠家供應(yīng)</p><p><span>***更新：</span>2020-05-24 12:31:22</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="vug3ub8" 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(jī): </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="fj78ye7" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="oseanjk" class="box"><p><p> 優(yōu)點(diǎn) </p> <p> 1、啟閉方便迅速、省力、流體阻力小，可以經(jīng)常操作。 </p> <p> 2、結(jié)構(gòu)簡單，外形尺寸小，結(jié)構(gòu)長度短，體積小，重量輕，適用于大口徑的閥門。 </p> <p> 3、可以運(yùn)送泥漿，在管道口積存液體**少。 </p> <p> 4、低壓下，可以實(shí)現(xiàn)良好的密封。 </p> <p> 5、調(diào)節(jié)性能好。 </p> <p> 6、全開時(shí)閥座通道有效流通面積較大，流體阻力較小。 </p> <p> 7、啟閉力矩較小，由于轉(zhuǎn)軸兩側(cè)蝶板受介質(zhì)作用基本相等，而產(chǎn)生轉(zhuǎn)矩的方向相反，因而啟閉較省力。 </p> <p> 8、密封面材料一般采用橡膠、塑料、故低壓密封性能好。 </p> <p> 9、安裝方便。 </p> <p> 10，河南進(jìn)口真空管道蝶閥廠家供應(yīng)、操作靈活省力，河南進(jìn)口真空管道蝶閥廠家供應(yīng)，可選擇手動(dòng)、電動(dòng)，河南進(jìn)口真空管道蝶閥廠家供應(yīng)、氣動(dòng)、液壓方式。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南進(jìn)口真空管道蝶閥廠家供應(yīng)" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737496894532/5616452.png"></div><p> 一：軟硬密封蝶閥的區(qū)別： </p> <p> <br /> </p> <p> 硬密封蝶閥：密封副的兩側(cè)均是金屬材料或較硬的其它材料的被稱為"硬密封".這種密封的密封性能較差,但耐高溫,抗磨損,機(jī)械性能好.如:鋼+鋼;鋼+銅;鋼+石墨;鋼+合金鋼;(這里的鋼也可能是鑄鐵,鑄鋼,合金鋼也可能是堆焊,噴涂的合金). </p> <p> <br /> </p> <p> 硬密封使用壽命長，但是密封性相對比軟密封差。 </p> <p> <br /> </p> <p> 軟密封的優(yōu)點(diǎn)是密封性能好，缺點(diǎn)是容易老化、磨損、使用壽命短。 </p> <p> <br /> </p> <p> 軟密封：密封副的兩側(cè)一側(cè)是金屬材料,另一側(cè)是有彈性的非金屬材料的被稱為"軟密封".這種密封的密封性能較好,但不耐高溫,易磨損,機(jī)械性較差.如:鋼+橡膠;鋼+四氟[wiki]聚乙烯[/wiki];等轉(zhuǎn)子泵. </p> <p> <br /> </p> <p> 二：密封蝶閥特點(diǎn)： </p> <p> <br /> </p> <p> 1、蝶板密封面采用堆焊鈷基硬質(zhì)合金，密封面耐磨損，使用壽命長 </p> <p> <br /> </p> <p> 2、密封圈選用不銹鋼制作，具有金屬硬密封和彈性密封的雙重優(yōu)點(diǎn)，無論在低溫和高溫的情況下，均具有優(yōu)良的密封性能，具有耐腐蝕,使用壽命長等特點(diǎn) </p> <p> <br /> </p> <p> 3、硬密封蝶閥具有雙向密封功能，安裝時(shí)不受介質(zhì)流向的限制，也不受空間位置的影響，可在任何方向安裝。 </p> <p> <br /> </p> <p> 4、大規(guī)格蝶板采用絎架結(jié)構(gòu)，強(qiáng)度高，過流面積大，流阻小 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南進(jìn)口真空管道蝶閥廠家供應(yīng)" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129749325380860/6768130.png"></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)的手段和儀器來檢測的微小外泄漏。目前國際上比較常用的檢測閥門低泄漏的標(biāo)準(zhǔn)主要有以下三種： </p> <p> <br /> </p> <p> (1)美國環(huán)境保護(hù)署EPA method 21《揮發(fā)性有機(jī)組分泄漏檢測》。 </p> <p> <br /> </p> <p> (2)國際標(biāo)準(zhǔn)化組織ISO 15848(工業(yè)閥門：低泄漏測量、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：低泄漏測量、分級系統(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> 美國環(huán)境保護(hù)署EPA Method 21標(biāo)準(zhǔn)*規(guī)定了檢測方法而沒有泄漏等級的劃分，屬于地方性標(biāo)準(zhǔn)法規(guī)，應(yīng)用較少。國際標(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)，對于閥門的性能，都從緊密等級、耐久等級和溫度等級三個(gè)方面進(jìn)行評定。緊密等級針對閥桿和閥體密封處的泄漏，分為A，B，C三個(gè)等級，對于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級密封等級比較高，B，c級密封等級同SHELLMESC SPE 77／312標(biāo)準(zhǔn)。通常低泄漏閥門的密封等級低于B級，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，其密封等級低于A級。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="河南進(jìn)口真空管道蝶閥廠家供應(yīng)" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737719785157/327671.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/28088.html</p></div></div></div></div></div><div id="zjasj72" class="page-right twoColRt"><div id="3pvm3b3" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="rqxefwt" class="recomPic likePro"><a 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