美國派克(ke)調節閥(fa)(fa)是通(tong)(tong)過(guo)旋轉旋鈕(niu)的(de)膜片(pian)(pian)開度變(bian)化，氣流(liu)通(tong)(tong)過(guo)孔徑的(de)變(bian)化，從而使(shi)空(kong)(kong)氣受(shou)量的(de)變(bian)化，本實用更多(duo)的(de)空(kong)(kong)氣，減少(shao)隔膜的(de)壓(ya)縮，孔的(de)增大，體積(ji)也更大，當(dang)下(xia)游隨著空(kong)(kong)氣流(liu)量的(de)減少(shao)。膜片(pian)(pian)的(de)力(li)使(shi)通(tong)(tong)孔變(bian)小，減少(shao)空(kong)(kong)氣流(liu)動，多(duo)余的(de)氣體會從溢(yi)(yi)流(liu)閥(fa)(fa)溢(yi)(yi)出。接下(xia)來小編(bian)為大家介紹(shao)調壓(ya)閥(fa)(fa)工(gong)作(zuo)原理及調壓(ya)閥(fa)(fa)作(zuo)用。

PARKER減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)工作(zuo)原理(li)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)按(an)結構形式(shi)(shi)(shi)(shi)(shi)可分為(wei)(wei)薄(bo)膜(mo)式(shi)(shi)(shi)(shi)(shi)、彈(dan)簧(huang)薄(bo)膜(mo)式(shi)(shi)(shi)(shi)(shi)、活塞式(shi)(shi)(shi)(shi)(shi)、杠桿(gan)式(shi)(shi)(shi)(shi)(shi)和波紋管式(shi)(shi)(shi)(shi)(shi)；按(an)閥(fa)(fa)(fa)(fa)座數目(mu)可人(ren)為(wei)(wei)單座式(shi)(shi)(shi)(shi)(shi)和雙座式(shi)(shi)(shi)(shi)(shi)；按(an)閥(fa)(fa)(fa)(fa)瓣的(de)位置(zhi)不(bu)同可分為(wei)(wei)正作(zuo)用式(shi)(shi)(shi)(shi)(shi)和反作(zuo)用式(shi)(shi)(shi)(shi)(shi)。先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)當減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)的(de)輸出壓(ya)(ya)(ya)(ya)(ya)力較高或通徑(jing)較大(da)時，用調壓(ya)(ya)(ya)(ya)(ya)彈(dan)簧(huang)直(zhi)接調壓(ya)(ya)(ya)(ya)(ya)，則(ze)(ze)彈(dan)簧(huang)剛(gang)度必(bi)然過大(da)，流(liu)量變化時，輸出壓(ya)(ya)(ya)(ya)(ya)力波動(dong)較大(da)，閥(fa)(fa)(fa)(fa)的(de)結構尺寸也將(jiang)增大(da)。為(wei)(wei)了克服這些缺點，可采用先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)。先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)的(de)工作(zuo)原理(li)與直(zhi)動(dong)式(shi)(shi)(shi)(shi)(shi)的(de)基本相同。先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)所用的(de)調壓(ya)(ya)(ya)(ya)(ya)氣體(ti)，是由小型(xing)的(de)直(zhi)動(dong)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)供給的(de)。若把小型(xing)直(zhi)動(dong)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)裝在閥(fa)(fa)(fa)(fa)體(ti)內(nei)部(bu)(bu)，則(ze)(ze)稱為(wei)(wei)內(nei)部(bu)(bu)先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)；若將(jiang)小型(xing)直(zhi)動(dong)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)裝在主閥(fa)(fa)(fa)(fa)體(ti)外部(bu)(bu)，則(ze)(ze)稱為(wei)(wei)外部(bu)(bu)先(xian)導(dao)(dao)式(shi)(shi)(shi)(shi)(shi)減(jian)(jian)(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)(fa)(fa)。

PARKER減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)的(de)(de)輸出壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)較(jiao)高(gao)(gao)或通徑較(jiao)大(da)時(shi)(shi)，用(yong)(yong)調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)彈簧直(zhi)接調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)，則彈簧剛(gang)度必然過大(da)，流量變(bian)化時(shi)(shi)，輸出壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)波動(dong)(dong)較(jiao)大(da)，閥(fa)(fa)的(de)(de)結構尺寸也(ye)將增大(da)。為(wei)了(le)克服這(zhe)些缺(que)點，可采用(yong)(yong)先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)。先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)的(de)(de)工作原(yuan)理與直(zhi)動(dong)(dong)式(shi)(shi)(shi)的(de)(de)基本相同。先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)所用(yong)(yong)的(de)(de)調壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)氣(qi)體(ti)(ti)，是由小(xiao)型的(de)(de)直(zhi)動(dong)(dong)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)供(gong)給的(de)(de)。若把小(xiao)型直(zhi)動(dong)(dong)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)裝在閥(fa)(fa)體(ti)(ti)內(nei)部(bu)(bu)，則稱為(wei)內(nei)部(bu)(bu)先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)；若將小(xiao)型直(zhi)動(dong)(dong)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)裝在主閥(fa)(fa)體(ti)(ti)外部(bu)(bu)，則稱為(wei)外部(bu)(bu)先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)。 圖(tu)14—2所示為(wei)內(nei)部(bu)(bu)先導(dao)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)的(de)(de)結構圖(tu)，與直(zhi)動(dong)(dong)式(shi)(shi)(shi)減(jian)(jian)(jian)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)閥(fa)(fa)相比，該(gai)閥(fa)(fa)增加了(le)由噴嘴(zui)4、擋(dang)板(ban)3、固(gu)定節流孔9及氣(qi)室(shi)B所組成的(de)(de)噴嘴(zui)擋(dang)板(ban)放(fang)大(da)環節。當噴嘴(zui)與擋(dang)板(ban)之(zhi)間的(de)(de)距離發生微(wei)小(xiao)變(bian)化時(shi)(shi)，就會使(shi)B室(shi)中的(de)(de)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)力(li)發生根明顯的(de)(de)變(bian)化，從而引起膜片10有較(jiao)大(da)的(de)(de)位移，去控制(zhi)閥(fa)(fa)芯6的(de)(de)上下移動(dong)(dong)，使(shi)進氣(qi)閥(fa)(fa)口8開大(da)或關小(xiao)、提高(gao)(gao)了(le)對(dui)閥(fa)(fa)芯控制(zhi)的(de)(de)靈敏(min)度，即提高(gao)(gao)了(le)穩(wen)壓(ya)(ya)(ya)(ya)(ya)(ya)(ya)精度。

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