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頂耕國際貿(mào)易供應(yīng)</h1><div id="ga3wamo" class="proBig"><div id="lvhjvm8" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737718496094/8657721.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="92n3ww4" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737718496094/8657721.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="ztfh3c8" 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>浙江FSA真空管道蝶閥廠家供應(yīng)</p><p><span>***更新：</span>2020-05-29 15:43:42</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="8y9wdk9" 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="r7bawnm" class="page-proshow02"><p class="title">詳細說明</p><div id="ys8nkmd" class="box"><p><p> 真空閥門是指閥門內(nèi)腔為真空狀態(tài)，通常叫負壓，浙江FSA真空管道蝶閥廠家供應(yīng)，內(nèi)腔壓力低于大氣壓，用于真空管道系統(tǒng)的閥門，有真空球閥，真空蝶閥，真空隔膜閥等。介質(zhì)為高純度。 </p> <p> 球閥、閘閥、截止閥等等均能生產(chǎn)成真空閥和普通常規(guī)閥門。從外形上無區(qū)別，在閥門連接部位設(shè)計上是有分別的，只是細節(jié)上的問題。 </p> <p> 真空閥門相對于正壓閥門具有下列特點： </p> <p> 壓力低于大氣壓，而閥瓣上的壓降不能超過1公斤力/厘米2。介質(zhì)的工作溫度取決于使用裝置的工藝過程。溫度一般不超過-70 ~ +150℃的范圍。 </p> <p> 對這類閥門**基本的要求是保證連接的高度密封性和結(jié)構(gòu)與墊片材料的致密性。 </p> <p> 按介質(zhì)壓力真空閥門可分成四組： </p> <p> 1）低真空閥門：介質(zhì)壓力p=760~1毫米汞柱； </p> <p> 2）中真空閥門：p=1×10-3 毫米汞柱。 </p> <p> 3）高真空閥門：p=1×10-4 ~1×10-7 毫米汞柱； </p> <p> 4）超高真空閥門：p≤1×10-8 毫米汞柱，浙江FSA真空管道蝶閥廠家供應(yīng)。 </p> <p> 真空閥門很多采用的的閥桿作直線運動的真空波紋管截止閥，浙江FSA真空管道蝶閥廠家供應(yīng)。閘閥卻受到較大的限制，但大通徑來說，可用的還有球閥、柱塞閥和蝶閥。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江FSA真空管道蝶閥廠家供應(yīng)" src="https://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737718496094/8657721.jpg"></div><p> 2 國際上閥門密封等級分類標準 </p> <p> <br /> </p> <p> 目前圍際上比較常用的閥門密封等級分類標準主要有以下。 </p> <p> <br /> </p> <p> 2．2 國際標準化組織對閥門密封等級的分類 </p> <p> <br /> </p> <p> 國際標準化組織標準ISO5208《工業(yè)閥門金屬閥門的壓力試驗》。 </p> <p> <br /> </p> <p> 2．3 美國石油協(xié)會(APl)對閥門密封等級的分類美國石油協(xié)會標準API 598--2004《閥門的檢查和試驗》。 </p> <p> <br /> </p> <p> 2．4 美國閥門和管件工業(yè)制造商標準化協(xié)會(MSS)對閥門密封等級的分類美國閥門和管件工業(yè)制造商標準化協(xié)會標準《鋼制閥門的壓力試驗》MSS SP61允許的閥門泄漏量要求如下： </p> <p> <br /> </p> <p> (1)在閥門密封副中有一個密封面使用塑料或橡膠的情況下，在密封試驗的持續(xù)時間內(nèi)應(yīng)無可見泄漏。 </p> <p> <br /> </p> <p> (2)關(guān)閉時每一側(cè)的比較大允許泄漏量應(yīng)是：液體為公稱尺寸(DN)每毫米、每小時0．4毫升；氣體為公稱尺寸(DN)每毫米、每小時120毫升。 </p> <p> <br /> </p> <p> (3)止回閥允許的泄漏量可增大4倍。 </p> <p> <br /> </p> <p> 2．5 美國國家標準／美國儀表協(xié)會標準(ANSI／FCI)對控制閥密封等級的分類 </p> <p> <br /> </p> <p> 美國國家標彬美國儀表協(xié)會標準ANSI／FCI70-2(ASME B16．104)《控制閥閥座泄漏》。 </p> <p> <br /> </p> <p> 2．6 歐盟標準對閥門密封等級的分類 </p> <p> <br /> </p> <p> 歐洲標準EN 12266—1《工業(yè)閥門閥門的試驗》第l部分。壓力試驗、試驗方法和驗收標準-強制性要求。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江FSA真空管道蝶閥廠家供應(yīng)" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737890810547/4528489.jpg"></div><p> 單偏心蝶閥 </p> <p> 為解決同心蝶閥的蝶板與閥座的擠壓問題、產(chǎn)生了單偏心蝶閥、結(jié)構(gòu)特征為閥桿軸心偏離了蝶板中心、從而使蝶板上下端不再成為回轉(zhuǎn)軸心、分散、減輕了蝶板上下端與閥座的過度擠壓。 </p> <p> 雙偏心蝶閥 </p> <p> 單偏心蝶閥的基礎(chǔ)上進一步改良成型的就是目前應(yīng)用**很多的雙偏心蝶閥。其結(jié)構(gòu)特征為在閥桿軸心既偏離蝶板中心、也偏離本體中心。雙偏心的效果使閥門被開啟后蝶板能迅即脫離閥座、大幅度地消除了蝶板與閥座的不必要的過度擠壓、刮擦現(xiàn)象、減輕了開啟阻距、降低了磨損、提高了閥座壽命。 </p> <p> 三偏心蝶閥 </p> <p> 要耐高溫、必須使用硬密封、但泄漏量大；要零泄漏、必須使用軟密封、卻不耐高溫。為克服雙偏心蝶閥這一矛盾、又對蝶閥進行了第三次偏心。而所謂第三次偏心，就是密封副的形狀不是正錐，而是斜錐。 </p> <p> 變偏心蝶閥 </p> <p> 獨特之處在于安裝蝶板的閥桿軸是一個三段軸式結(jié)構(gòu)，此三段軸式閥桿兩段軸段同心，而中心段軸中心線與兩端軸線偏離一個中心距，蝶板就安裝在中間軸段上。這樣的偏心結(jié)構(gòu)使得蝶板在全開位置時成為雙偏心狀，而在蝶板轉(zhuǎn)動到關(guān)閉位置時則成為單偏心狀。由于偏心軸的作用，在接近關(guān)閉時，蝶板向閥座的密封錐面內(nèi)移進一個距離，蝶板與閥座的密封的密封面相吻合達到可靠的密封性能。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江FSA真空管道蝶閥廠家供應(yīng)" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737896250000/4170655.jpg"></div></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/79928.html</p></div></div></div></div></div><div id="ocokgxb" class="page-right twoColRt"><div id="smoamiu" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="zjvnzqs" 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" 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