英國NORGREN諾冠電磁閥諾冠精密調壓閥是怎么工作的
適用于氣動計量和實驗室以及精密先導控制,當輸出壓力高于設置壓力時整體式安全閥可自動溢流,在到達先導閥之前的雙濾單元協助阻止泄漏和故障易于面板安裝
NORGREN精密調壓閥,諾冠過濾器,NORGREN減壓閥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,閥的結構尺寸也將增大。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內部,則稱為內部先導式減壓閥;若將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。與直動式減壓閥相比,該閥增加了由噴嘴4、擋板固定節流孔9及氣室B所組成的噴嘴擋板放大環節。當噴嘴與擋板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。
NORGREN減壓閥是一種高精度的減壓閥,主要用于壓力定值。目前有兩種壓力規格的定值器:其氣源壓力分別為0.14MPa和0.35MPa,輸出壓力范圍分別為0—0.1MPa和0一0.25MPa。其輸出壓力波動不大于zui大輸出壓力的1%,常用于需要供給精確氣源壓力和信號壓力的場合,如氣動實驗設備、氣動自動裝置等。
由于定值器利用輸出壓力的反饋作用和噴嘴擋板的放大作用控制主閥,使其能對較小的壓力變化作出反應,從而使輸出壓力得到及時調節,保持出口壓力基本穩定,即定值穩壓精度較高。
英國NORGREN諾冠電磁閥諾冠精密調壓閥是怎么工作的
NORGREN精密調壓閥的基本性能
(1) 調壓范圍:它是指減壓閥輸出壓力P2的可調范圍,在此范圍內要求達到規定的精度。調壓范圍主要與調壓彈簧的剛度有關。
(2) 壓力特性:它是指流量g為定值時,因輸入壓力波動而引起輸出壓力波動的特性。輸出壓力波動越小,減壓閥的特性越好。輸出壓力必須低于輸入壓力—定值才基本上不隨輸入壓力變化而變化。
(3) 流量特性:它是指輸入壓力—定時,輸出壓力隨輸出流量g的變化而變化的持性。當流量g發生變化時,輸出壓力的變化越小越好。一般輸出壓力越低,它隨輸出流量的變化波動就越小。
英國NORGREN諾冠電磁閥諾冠精密調壓閥是怎么工作的
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