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介質(zhì)的流速大，閥門(mén)通徑可以小些，但阻力損失較大，閥門(mén)易損壞。流速大，對易燃易爆介質(zhì)會(huì )產(chǎn)生靜電效應，造成危險；流速太小，效率低，不經(jīng)濟。對粘度大和易爆的介質(zhì)，應取較小的流速。油及粘度大的液體隨粘度大小選擇流速，一般取0.1～2m/s。</p><p> 一般情況下，流量是已知的，流速可由經(jīng)驗確定。通過(guò)流速和流量可以計算閥門(mén)的公稱(chēng)通徑。</p><p> 閥門(mén)通徑相同，其結構型式不同，流體的阻力也不一樣。在相同條件下，閥門(mén)的阻力系數越大，流體通過(guò)閥門(mén)的流速、流量下降越多；閥門(mén)阻力系數越小，流體通過(guò)閥門(mén)的流速、流量下降越少。</p><p><br/></p></div> <div id="hn5hjx1" class="clear"></div> <dl class="news_page clearfix"> <dt class="pagepre"> 上一篇：篇</dt> <dd class="pagenext"> 下一篇：<a href="/index.php/Show/index/cid/471/id/957.html">布袋除塵器屬于什么設備</a></dd> </dl> </div> <div id="5jn5vjl" class="clear"></div> </div> <div id="tzrvx5h" class="clear"></div> </div> <div id="pjjjbf5" class="f_bg"> <div id="5xflr5f" class="footer"> <h5 class="f_logo fl"><a href="/"><img src="/Public/Home/default/images/dbewm.jpg"></a></h5> <div id="55txzxx" class="f02 fl"> <div id="pxx5bf5" class="f_nav"> <ul> <li> <a href="/index.php/Index/index.html"> 官網(wǎng)首頁(yè) </a> </li> <li> <a 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