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VICKERS電磁(ci)閥(fa)(fa)出來(lai)的(de)(de)(de)先導(dao)油(you)控(kong)制主(zhu)換向(xiang)閥(fa)(fa)閥(fa)(fa)芯的(de)(de)(de)移(yi)(yi)動(dong)，使工作(zuo)泵的(de)(de)(de)來(lai)油(you)進入(ru)動(dong)臂(bei)油(you)缸(gang)實現動(dong)臂(bei)上(shang)升(sheng)(sheng)。比例先導(dao)減壓閥(fa)(fa)的(de)(de)(de)輸(shu)出壓力越(yue)大(da)，控(kong)制主(zhu)換向(xiang)閥(fa)(fa)閥(fa)(fa)芯的(de)(de)(de)位(wei)(wei)(wei)(wei)(wei)移(yi)(yi)越(yue)大(da)，主(zhu)換向(xiang)閥(fa)(fa)通(tong)過的(de)(de)(de)流量(liang)越(yue)大(da)，動(dong)臂(bei)上(shang)升(sheng)(sheng)的(de)(de)(de)速(su)度越(yue)快(kuai)。當操(cao)作(zuo)手柄拉*限(xian)位(wei)(wei)(wei)(wei)(wei)置時，手柄中的(de)(de)(de)限(xian)位(wei)(wei)(wei)(wei)(wei)電磁(ci)鐵(tie)通(tong)電，手柄在極限(xian)位(wei)(wei)(wei)(wei)(wei)置被吸合。動(dong)臂(bei)以zui大(da)的(de)(de)(de)速(su)度上(shang)升(sheng)(sheng)，當升(sheng)(sheng)至動(dong)臂(bei)上(shang)位(wei)(wei)(wei)(wei)(wei)限(xian)位(wei)(wei)(wei)(wei)(wei)開關所限(xian)定(ding)的(de)(de)(de)位(wei)(wei)(wei)(wei)(wei)置時，操(cao)作(zuo)手柄限(xian)位(wei)(wei)(wei)(wei)(wei)電磁(ci)鐵(tie)斷電，手柄自動(dong)恢復(fu)到(dao)中位(wei)(wei)(wei)(wei)(wei)，動(dong)臂(bei)就可保持在所限(xian)定(ding)的(de)(de)(de)位(wei)(wei)(wei)(wei)(wei)置。在動(dong)臂(bei)上(shang)升(sheng)(sheng)的(de)(de)(de)過程中，若需要(yao)動(dong)臂(bei)在某一位(wei)(wei)(wei)(wei)(wei)置停留(liu)，則需將(jiang)操(cao)作(zuo)手柄退回中位(wei)(wei)(wei)(wei)(wei)。

主要由閥(fa)體、密封(feng)組件、凸(tu)(tu)(tu)輪、閥(fa)桿(gan)、手(shou)柄(bing)和閥(fa)蓋等零部(bu)件組成（圖1）。閥(fa)門由手(shou)柄(bing)驅動，通過手(shou)柄(bing)帶動閥(fa)桿(gan)與凸(tu)(tu)(tu)輪旋(xuan)轉(zhuan)，凸(tu)(tu)(tu)輪具有定(ding)位驅動與鎖定(ding)密封(feng)組件的(de)(de)開啟與關(guan)(guan)閉功能。手(shou)柄(bing)逆時針(zhen)旋(xuan)轉(zhuan)，兩組密封(feng)組件分別在凸(tu)(tu)(tu)輪的(de)(de)作用下(xia)關(guan)(guan)閉下(xia)端(duan)的(de)(de)兩個(ge)通道(dao)，上(shang)端(duan)的(de)(de)兩個(ge)通道(dao)分別與管道(dao)裝置的(de)(de)進(jin)口(kou)相(xiang)通。反之，上(shang)端(duan)的(de)(de)兩個(ge)通道(dao)關(guan)(guan)閉，下(xia)端(duan)兩個(ge)通道(dao)與管道(dao)裝置的(de)(de)進(jin)口(kou)相(xiang)通，實現了不停車換(huan)向(xiang)。

優點

　　動作準確、自(zi)動化程度(du)高、工作穩定可靠，但(dan)需附(fu)設(she)驅(qu)動和(he)冷卻系統，結構較為復雜；閥(fa)瓣式(shi)結構則較簡(jian)單(dan)，多(duo)用于(yu)流量較小的生(sheng)產工藝上。

　　在(zai)石油(you)、化工、礦山和冶(ye)金等行業中，六通換向閥(fa)是(shi)一(yi)種重要的流體(ti)換向設備。該(gai)閥(fa)安(an)裝在(zai)稀油(you)潤滑(hua)系統輸(shu)送潤滑(hua)油(you)的管道中。通過變換密封組件在(zai)閥(fa)體(ti)中的相(xiang)對(dui)位置，使(shi)閥(fa)體(ti)各通道連通或斷開，從而控制流體(ti)的換向和啟停。

VICKERS PVH057R01AA10A250000001AE1AB010A 
VICKERS PVH057R01AA10A250000002001AB010A       
VICKERS PVH057R01AA10E252004001001AA010A  
VICKERS PVH057R01AB10A250000002001AE010A  
VICKERS PVH074L02AA10B252000001001AA010A         
VICKERS PVH074L13AA10B202000001AL1AB010A          
VICKERS PVH074R01AA10A250000002001AB010A 
VICKERS PVH074R01AA10A250000002001AB010A   
VICKERS PVH074R01AA10A250000002001AB010A
VICKERS PVH074R01AA10H002000AW1001AB010A  

VICKERS換向(xiang)(xiang)(xiang)閥DG4V-3-6C-VM-U-H7-60主(zhu)要用(yong)(yong)(yong)在(zai)水(shui)泵出口，起著防止(zhi)(zhi)(zhi)(zhi)介(jie)質倒(dao)流(liu)(liu)的(de)作(zuo)用(yong)(yong)(yong)。主(zhu)要應用(yong)(yong)(yong)在(zai)高層建筑給排水(shui)、消(xiao)防、空調泵房(fang)系(xi)統。止(zhi)(zhi)(zhi)(zhi)回(hui)閥成為(wei)消(xiao)聲(sheng)止(zhi)(zhi)(zhi)(zhi)回(hui)閥，是因為(wei)止(zhi)(zhi)(zhi)(zhi)回(hui)閥具(ju)有(you)消(xiao)除噪聲(sheng)的(de)特大優點。這取決于(yu)(yu)它結構長度短、重(zhong)量輕、密封性能(neng)好的(de)特點。泵前消(xiao)聲(sheng)止(zhi)(zhi)(zhi)(zhi)回(hui)閥鐵殼銅芯適(shi)用(yong)(yong)(yong)于(yu)(yu)給、排水(shui)管(guan)道，止(zhi)(zhi)(zhi)(zhi)回(hui)閥閥瓣(ban)采(cai)用(yong)(yong)(yong)進出口兩端(duan)中心軸(zhou)導(dao)向(xiang)(xiang)(xiang)，啟閉(bi)靈活，可水(shui)平定(ding)裝或垂直(zhi)安(an)裝。閥瓣(ban)采(cai)用(yong)(yong)(yong)彈簧加(jia)載，其快(kuai)速關(guan)(guan)閉(bi)能(neng)有(you)效地減小水(shui)錘壓(ya)力(li)，密封性能(neng)好，關(guan)(guan)閉(bi)無噪聲(sheng)。止(zhi)(zhi)(zhi)(zhi)回(hui)閥具(ju)有(you)體(ti)積小、重(zhong)量輕、流(liu)(liu)體(ti)阻(zu)力(li)小、耐疲勞、壽命(ming)長等(deng)優點，產生(sheng)的(de)的(de)作(zuo)用(yong)(yong)(yong)是只(zhi)允許介(jie)質向(xiang)(xiang)(xiang)一個方向(xiang)(xiang)(xiang)流(liu)(liu)動(dong)，而且阻(zu)止(zhi)(zhi)(zhi)(zhi)方向(xiang)(xiang)(xiang)流(liu)(liu)動(dong)。通常止(zhi)(zhi)(zhi)(zhi)回(hui)閥是自動(dong)工作(zuo)的(de)，在(zai)一個方向(xiang)(xiang)(xiang)流(liu)(liu)動(dong)的(de)流(liu)(liu)體(ti)壓(ya)力(li)作(zuo)用(yong)(yong)(yong)下(xia)，閥瓣(ban)打(da)開；流(liu)(liu)體(ti)反方向(xiang)(xiang)(xiang)流(liu)(liu)動(dong)時，由流(liu)(liu)體(ti)壓(ya)力(li)和閥瓣(ban)的(de)自重(zhong)合閥瓣(ban)作(zuo)用(yong)(yong)(yong)于(yu)(yu)閥座(zuo)，從而切斷流(liu)(liu)動(dong)。不宜用(yong)(yong)(yong)于(yu)(yu)含(han)有(you)固(gu)體(ti)顆粒和粘度較大的(de)介(jie)質。