減壓閥的工作原理,減壓閥的選用,減壓閥技巧 - 廣州富山閥門有限公司_威客电竞

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減壓閥的工作原理與選用技巧

2015-10-10 09:39:50| 發布者: 廣州富山閥門有限公司| 查看: 1530

減壓閥的工作原理

減壓閥是氣動調節閥的一個必備配件,主要作用是将氣源的壓力減壓并穩定到一個定值,以便于調節閥能夠獲得穩定的氣源動力用于調節控制。 按結構形式可分為薄膜式、彈簧薄膜式、活塞式、杠杆式和波紋管式;按閥座數目可人為單座式和雙座式;按閥瓣的位置不同可分為正作用式和反作用式。

當減壓閥的輸出壓力較高或通徑較大時,用調壓彈簧直接調壓,則彈簧剛度必然過大,流量變化時,輸出壓力波動較大,閥的結構尺寸也将增大。為了克服這些缺點,可采用先導式減壓閥。先導式減壓閥的工作原理與直動式的基本相同。先導式減壓閥所用的調壓氣體,是由小型的直動式減壓閥供給的。若把小型直動式減壓閥裝在閥體内部,則稱為内部先導式減壓閥;若将小型直動式減壓閥裝在主閥體外部,則稱為外部先導式減壓閥。圖14—2所示為内部先導式減壓閥的結構圖,與直動式減壓閥相比,該閥增加了由噴嘴4、擋闆3、固定節流孔9及氣室B所組成的噴嘴擋闆放大環節。當噴嘴與擋闆之間的距離發生微小變化時,就會使B室中的壓力發生根明顯的變化,從而引起膜片10有較大的位移,去控制閥芯6的上下移動,使進氣閥口8開大或關小、提高了對閥芯控制的靈敏度,即提高了穩壓精度。

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