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操作(zuo)(zuo)(zuo)形式；該(gai)閥(fa)采(cai)用導閥(fa)，主閥(fa)構(gou)造，結構(gou)緊(jin)湊，重量較輕。該(gai)閥(fa)安裝于(yu)(yu)水(shui)(shui)泵(beng)(beng)出口(kou),在單泵(beng)(beng)啟動(dong)和非(fei)全(quan)數設(she)(she)計(ji)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)泵(beng)(beng)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)時(shi)(shi)(shi)，對工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)泵(beng)(beng)起限制(zhi)(zhi)(zhi)(zhi)(zhi)流量作(zuo)(zuo)(zuo)用，使泵(beng)(beng)在較率狀態下工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)；防止(zhi)電(dian)動(dong)機(ji)(ji)在水(shui)(shui)泵(beng)(beng)低揚(yang)(yang)(yang)(yang)程(cheng)(cheng)、大(da)流量、低效率時(shi)(shi)(shi)，發(fa)生過(guo)載現象；防止(zhi)超額(e)定(ding)(ding)(ding)電(dian)流燒電(dian)機(ji)(ji)現象的(de)(de)(de)(de)(de)發(fa)生，同時(shi)(shi)(shi)起到一(yi)定(ding)(ding)(ding)的(de)(de)(de)(de)(de)節能(neng)效果。其限流原理為：依據水(shui)(shui)泵(beng)(beng)的(de)(de)(de)(de)(de)設(she)(she)計(ji)工(gong)(gong)(gong)(gong)(gong)(gong)況點(dian)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)，導閥(fa)自動(dong)檢測并(bing)控制(zhi)(zhi)(zhi)(zhi)(zhi)水(shui)(shui)泵(beng)(beng)的(de)(de)(de)(de)(de)實際(ji)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)，以限制(zhi)(zhi)(zhi)(zhi)(zhi)水(shui)(shui)泵(beng)(beng)的(de)(de)(de)(de)(de)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)流量，限制(zhi)(zhi)(zhi)(zhi)(zhi)電(dian)機(ji)(ji)的(de)(de)(de)(de)(de)負載。該(gai)閥(fa)設(she)(she)定(ding)(ding)(ding)一(yi)個控制(zhi)(zhi)(zhi)(zhi)(zhi)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)，當(dang)水(shui)(shui)泵(beng)(beng)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)低于(yu)(yu)控制(zhi)(zhi)(zhi)(zhi)(zhi)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)時(shi)(shi)(shi)閥(fa)門(men)做關閥(fa)動(dong)作(zuo)(zuo)(zuo)，使實際(ji)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)加(jia)大(da)；當(dang)水(shui)(shui)泵(beng)(beng)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)大(da)于(yu)(yu)設(she)(she)定(ding)(ding)(ding)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)時(shi)(shi)(shi)閥(fa)門(men)全(quan)開(kai)，閥(fa)門(men)阻力極小。控制(zhi)(zhi)(zhi)(zhi)(zhi)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)的(de)(de)(de)(de)(de)設(she)(she)定(ding)(ding)(ding)可(ke)(ke)(ke)以按電(dian)機(ji)(ji)額(e)定(ding)(ding)(ding)電(dian)流設(she)(she)定(ding)(ding)(ding)，也(ye)可(ke)(ke)(ke)以按率工(gong)(gong)(gong)(gong)(gong)(gong)況設(she)(she)定(ding)(ding)(ding)，該(gai)閥(fa)門(men)工(gong)(gong)(gong)(gong)(gong)(gong)作(zuo)(zuo)(zuo)揚(yang)(yang)(yang)(yang)程(cheng)(cheng)設(she)(she)定(ding)(ding)(ding)值可(ke)(ke)(ke)調，一(yi)般出廠設(she)(she)定(ding)(ding)(ding)值為設(she)(she)計(ji)工(gong)(gong)(gong)(gong)(gong)(gong)況揚(yang)(yang)(yang)(yang)程(cheng)(cheng)。

先導閥的共同特點 　　
輸(shu)入(ru)(ru)信號(hao)都比較小；可(ke)以接受多(duo)(duo)種輸(shu)入(ru)(ru)方式，如手(shou)動(dong)、電動(dong)、液動(dong)、氣動(dong)、機械凸輪、電比例(li)等(deng)(deng)；根據(ju)輸(shu)入(ru)(ru)信號(hao)對主閥(fa)(fa)或次級閥(fa)(fa)或變(bian)量(liang)杠進(jin)行控制； 首級先導(dao)閥(fa)(fa)的流(liu)量(liang)一(yi)般都只在1升/分左(zuo)右，z大3升/分。二級先導(dao)閥(fa)(fa)流(liu)量(liang)就要根據(ju)實際需要決定。 在變(bian)量(liang)泵控制等(deng)(deng)情況，多(duo)(duo)種先導(dao)閥(fa)(fa)形成模塊化結(jie)構(gou)，多(duo)(duo)種功(gong)能取舍(she)方便； 先導(dao)閥(fa)(fa)本身(shen)往往就是一(yi)種小規格控制閥(fa)(fa)，多(duo)(duo)為壓力(li)控制閥(fa)(fa)。

55102009     55102011      EF8300D61U   43004422
U8325B39V   ; SCE238A007    43004166     NFB316A54
55192005     E238A207      34207093     EF8025B224
HT8316G074   12100309      34203086     8345G1
19200001     8210G13       8321G1       EF8300D61U
SCG531B001MS 8262G80M0     EF8320G188   EF8342C1
43550447     55192009      55192011     EV8316G82
8210G037     SCXG327A001   EF8210G088   EF8342G3MS

ASCO三通電磁(ci)閥具有三個(ge)(ge)管道連接和(he)兩個(ge)(ge)節流孔(kong)。當一個(ge)(ge)孔(kong)口(kou)打開時，另一個(ge)(ge)孔(kong)口(kou)關閉(bi)，反(fan)之亦然。它(ta)們(men)通常用(yong)于將壓(ya)力(li)交替(ti)施加(jia)到(dao)來自(zi)閥門執行器或(huo)單作用(yong)氣(qi)缸的排氣(qi)壓(ya)力(li)。這(zhe)些閥門可以常閉(bi)，常開或(huo)通用(yong)。