威(wei)格士(shi)VICKERS電磁(ci)閥(fa)/VICKERS中(zhong)國
VICKERS電磁(ci)閥(fa)出來的先(xian)導油(you)控(kong)制主(zhu)換向(xiang)閥(fa)閥(fa)芯的(de)移(yi)動，使(shi)工作泵的(de)來油進(jin)入動臂(bi)油缸實現(xian)動(dong)臂上升。比(bi)例(li)先(xian)導減壓(ya)閥(fa)的(de)輸(shu)出壓力越大，控制主(zhu)換向(xiang)閥(fa)閥(fa)芯的(de)位(wei)移越大，主(zhu)換向(xiang)閥(fa)通過的流量(liang)越大，動臂(bi)上(shang)升的速度(du)越快。當(dang)操(cao)作手(shou)柄拉(la)*限位(wei)置時，手(shou)柄中(zhong)的限位(wei)電磁(ci)鐵(tie)通電，手(shou)柄在(zai)極(ji)限位(wei)置被吸合(he)。動(dong)臂以(yi)zui大的速度(du)上升(sheng)，當(dang)升(sheng)至動(dong)臂上(shang)位(wei)限位(wei)開關所限定的(de)位(wei)置時，操作(zuo)手(shou)柄限位(wei)電磁(ci)鐵(tie)斷電，手(shou)柄自(zi)動恢(hui)復(fu)到(dao)中(zhong)位，動(dong)臂(bi)就可保(bao)持在(zai)所限定的(de)位(wei)置。在(zai)動臂上(shang)升的過程(cheng)中(zhong)，若(ruo)需要(yao)動(dong)臂在某壹(yi)位(wei)置(zhi)停留，則(ze)需將操(cao)作(zuo)手(shou)柄退(tui)回中(zhong)位。
威(wei)格士(shi)電磁(ci)閥(fa)*常(chang)規(gui)現(xian)貨(huo)型號如下(xia)：
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DG4V-3-0A-M-U-G7-60  （DC12）
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VICKERS電磁(ci)閥(fa)和(he)安(an)全閥(fa)為(wei)壹(yi)體(ti)，組成先(xian)導式(shi)壓(ya)力閥(fa)，該閥(fa)即(ji)是(shi)卸(xie)荷閥(fa)又(you)是(shi)安(an)全閥(fa)，有(you)時又是(shi)溢流(liu)閥(fa)．卸(xie)荷時其(qi)控(kong)制油道貫穿(chuan)各路換向(xiang)閥(fa)，同(tong)前(qian)述卸(xie)荷油(you)道．當(dang)各路換向(xiang)閥(fa)處(chu)於中(zhong)立(li)位(wei)置(zhi)時，卸(xie)荷閥(fa)的(de)控(kong)制油道（見圖1b和圖2）貫穿各路換向(xiang)閥(fa)並與(yu)油箱連通．卸(xie)荷時，大部分(fen)油(you)液(ye)卸(xie)荷，通道短，壓力損失(shi)低．任(ren)壹(yi)路閥(fa)換向(xiang)工作，便切(qie)斷(duan)控(kong)制油道，油源來油就從換向(xiang)閥(fa)進(jin)入執(zhi)行元件(jian)工作，其(qi)工作壓(ya)力大小由導閥(fa)控(kong)制．此時系(xi)統壓(ya)力為(wei)導閥(fa)調(tiao)整(zheng)壓(ya)力．該種卸(xie)荷方(fang)式(shi)，即(ji)使(shi)換向(xiang)閥(fa)路數增加(jia)，只(zhi)是控(kong)制油道增加(jia)，卸(xie)荷壓(ya)力增加(jia)不(bu)大，始(shi)終(zhong)保(bao)持較(jiao)低卸(xie)荷壓(ya)力，此種卸(xie)荷方(fang)式(shi)多(duo)用於手(shou)動換向(xiang)閥(fa)，卸(xie)荷可(ke)靠．
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