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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>浙江德國(guó)真空管道蝶閥價(jià)格</p><p><span>***更新：</span>2020-06-22 14:26:09</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="fjlkmdp" 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="peq7lhj" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="j77vzgx" 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，浙江德國(guó)真空管道蝶閥價(jià)格。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，浙江德國(guó)真空管道蝶閥價(jià)格,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)，浙江德國(guó)真空管道蝶閥價(jià)格。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="浙江德國(guó)真空管道蝶閥價(jià)格" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737719785157/327671.jpg"></div><p> 從而使閥門密封的性能減小。因此，在選擇密封件時(shí)，一定要選擇具有彈性變形的密封件。同時(shí)，也要注意密封面的寬度。原因在于密封副的接觸面不能完全吻合，當(dāng)密封面寬度增加，就要加大密封所需要的作用力。2密封面比壓密封面的比壓大小影響著閥門密封性能大小和閥門的使用壽命。因此，密封面比壓也是非常重要的一個(gè)因素。在相同的條件下，比壓太大會(huì)引起閥門的損壞，但比壓太小酒會(huì)造成閥門泄漏。因此，需要我們?cè)谠O(shè)計(jì)時(shí)要充分考慮到比壓的合適度。3介質(zhì)的物理性質(zhì)介質(zhì)的物理性質(zhì)也影響到閥門密封性能。這些物理性質(zhì)包括溫度，粘度和表面的親水性等。溫度變化不僅影響著密封副的松弛度和零件尺寸的改變，還與氣體的粘度有著密不可分的關(guān)系。氣體粘度隨著溫度的升高或降低而增大或減小。因此，為了減少溫度對(duì)閥門密封性能的影響程度，我們?cè)谶M(jìn)行密封副設(shè)計(jì)時(shí)，要把其設(shè)計(jì)成彈性閥座等具有熱補(bǔ)償性的閥門。粘度與流體的滲透能力有關(guān)。當(dāng)在相同條件下時(shí)，粘度越大，流體的滲透能力就越小。表面的親水性是指在金屬表面有一層薄膜時(shí)，要去掉這層薄膜。因?yàn)檫@層很薄的油膜，會(huì)破壞表面的親水性，導(dǎo)致堵塞流體的通道。4密封副的質(zhì)量密封副質(zhì)量主要是指我們要對(duì)材料的選擇，匹配。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江德國(guó)真空管道蝶閥價(jià)格" src="http://tyunfile.71360.com/WaterMark/UploadFile/shdign/637129737496279297/8393517.png"></div><p> 真空閥門是指閥門內(nèi)腔為真空狀態(tài)，通常叫負(fù)壓，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(wú)區(qū)別，在閥門連接部位設(shè)計(jì)上是有分別的，只是細(xì)節(jié)上的問(wèn)題。 </p> <p> 真空閥門相對(duì)于正壓閥門具有下列特點(diǎn)： </p> <p> 壓力低于大氣壓，而閥瓣上的壓降不能超過(guò)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(guò)程。溫度一般不超過(guò)-70 ~ +150℃的范圍。 </p> <p> 對(duì)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。 </p> <p> 真空閥門很多采用的的閥桿作直線運(yùn)動(dòng)的真空波紋管截止閥。閘閥卻受到較大的限制，但大通徑來(lái)說(shuō)，可用的還有球閥、柱塞閥和蝶閥。 </p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/350920.html</p></div></div></div></div></div><div id="dseyuls" class="page-right twoColRt"><div id="r3jkhyk" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="88n7j7c" class="recomPic likePro"><a 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