德國(guó)FESTO減壓閥，F(xiàn)ESTO過濾減壓閥，費(fèi)斯托的調(diào)壓閥

德國(guó)FESTO減壓閥，F(xiàn)ESTO過濾減壓閥
FESTO過減壓閥正常工作，配用的執(zhí)行機(jī)構(gòu)要能產(chǎn)生足夠的輸出力來保證高度密封和閥門的開啟。 
對(duì)于雙作用的氣動(dòng)、液動(dòng)、電動(dòng)執(zhí)行機(jī)構(gòu)，一般都沒有復(fù)位彈簧。作用力的大小與它的運(yùn)行方向無關(guān)，因此，選擇執(zhí)行機(jī)構(gòu)的關(guān)鍵在于弄清zui大的輸出力和電機(jī)的轉(zhuǎn)動(dòng)力矩。對(duì)于單作用的氣動(dòng)執(zhí)行機(jī)構(gòu)，輸出力與閥門的開度有關(guān)，調(diào)節(jié)閥上的出現(xiàn)的力也將影響運(yùn)動(dòng)特性，因此要求在整個(gè)調(diào)節(jié)閥的開度范圍建立力平衡。
FESTO過減壓閥,festo過濾減壓閥,德國(guó)FESTO
FESTO過減壓閥是保護(hù)油罐安全的重要附件，裝設(shè)在油罐的頂板上，由壓力閥和真空閥兩部分組成。它的作用在一般情況下，保持油罐的密閉性，在一定程度上減少油品的蒸發(fā)損耗。而在必要時(shí)，能自動(dòng)通氣調(diào)節(jié)平衡油罐內(nèi)外壓力，對(duì)油罐起到安全作用。當(dāng)罐內(nèi)油氣壓力大于油罐允許壓力時(shí)，油蒸汽經(jīng)壓力閥外逸，此時(shí)真空閥處于關(guān)閉狀態(tài)；當(dāng)罐內(nèi)油氣壓力小于油罐允許真空度時(shí)，新鮮空氣通過真空閥進(jìn)入罐內(nèi)，此時(shí)壓力閥處于關(guān)閉狀態(tài)，允許壓力（或真空壓力）靠調(diào)節(jié)盤的重量來控制。
德國(guó)FESTO減壓閥，F(xiàn)ESTO過濾減壓閥
FESTO過減壓閥的輸出壓力較高或通徑較大時(shí)，用調(diào)壓彈簧直接調(diào)壓，則彈簧剛度必然過大，流量變化時(shí)，輸出壓力波動(dòng)較大，閥的結(jié)構(gòu)尺寸也將增大。為了克服這些缺點(diǎn)，可采用先導(dǎo)式減壓閥。先導(dǎo)式減壓閥的工作原理與直動(dòng)式的基本相同。先導(dǎo)式減壓閥所用的調(diào)壓氣體，是由小型的直動(dòng)式減壓閥供給的。若把小型直動(dòng)式減壓閥裝在閥體內(nèi)部，則稱為內(nèi)部先導(dǎo)式減壓閥；若將小型直動(dòng)式減壓閥裝在主閥體外部，則稱為外部先導(dǎo)式減壓閥。
 
圖14—2所示為內(nèi)部先導(dǎo)式減壓閥的結(jié)構(gòu)圖，與直動(dòng)式減壓閥相比，該閥增加了由噴嘴4、擋板3、固定節(jié)流孔9及氣室B所組成的噴嘴擋板放大環(huán)節(jié)。當(dāng)噴嘴與擋板之間的距離發(fā)生微小變化時(shí)，就會(huì)使B室中的壓力發(fā)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(dòng)，使進(jìn)氣閥口8開大或關(guān)小、提高了對(duì)閥芯控制的靈敏度，即提高了穩(wěn)壓精度。
產(chǎn)品代號(hào): 162727
過濾減壓閥 具有金屬保護(hù)罩和壓力表, 過濾等級(jí) 5 祄

德國(guó)FESTO減壓閥，F(xiàn)ESTO過濾減壓閥，費(fèi)斯托的調(diào)壓閥

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