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當前中心
閥門通徑和介質流速之間的關系，你知道多少？
兩者之間知乎問答有是什么直接關系？
調節閥的(de)流道規(gui)模(mo)與水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)、用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)都有一直相(xiang)(xiang)互之(zhi)間關系，而水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)與用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)是相(xiang)(xiang)互之(zhi)間依存的(de)5個(ge)量。當用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)一段(duan)時，水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)大(da)，流道規(gui)模(mo)便可小(xiao)些；水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)小(xiao)，流道規(gui)模(mo)就可能大(da)點。相(xiang)(xiang)反(fan)、，流道規(gui)模(mo)大(da)，其水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)小(xiao)；流道規(gui)模(mo)小(xiao)，其水用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)用(yong)(yong)(yong)(yong)戶(hu)(hu)(hu)(hu)(hu)大(da)。
介質的流速大，閥門通徑可以小些，但阻力損失較大，閥門易損壞。流速大，對易燃易爆介質會產生靜電效應，造成危險；流速太小，效率低，不經濟。對粘度大和易爆的介質，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。
一般情況下，流量是已知的，流速可由經驗確定。通過流速和流量可以計算閥門的公稱通徑。
閥門通徑相同，其結構型式不同，流體的阻力也不一樣。在相同條件下，閥門的阻力系數越大，流體通過閥門的流速、流量下降越多；閥門阻力系數越小，流體通過閥門的流速、流量下降越少。
多種多樣媒質普遍流動速度一睹表
注：
●DN值的單位為：mm
●P值的單位為：MPa
●閘閥的阻力系數小，僅在0.1～1.5的范圍內
●口徑大的閘閥，阻力系數為0.2～0.5
●縮口閘閥阻力系數大一些
●截止閥的阻力系數比閘閥大得多，一般在4～7之間。Y型截止閥（直流式）阻力系數最 小，在1.5～2之間
●鍛鋼截止閥阻力系數最大，甚至高達8
●止回閥的阻力系數視結構而定：旋啟式止回閥通常約為0.8～2，其中多瓣旋啟式止回閥的阻力系數較大
●升降式止回閥阻力系數最大，高達12
●旋塞閥的阻力系數小，通常約為0.4～1.2
●隔膜閥的阻力系數一般在2.3左右
●蝶閥的阻力系數小，一般在0.5以內
