DG4V系(xi)列
VICKERS換(huan)向閥有多(duo)級沈割槽(cao)的圓柱孔(kong)，結(jié)(jie)構(gòu)簡(jian)單(dan)、體(ti)積(ji)小(xiao)、重(zhong)量(liang)輕，只(zhi)由(you)少數(shù)幾個(gè)零件組成。而且只(zhi)需(xu)旋轉(zhuǎn)(zhuan)90度(du)即(ji)可(ke)快速(su)啟(qi)閉(bi)，操作簡(jian)單(dan)，同(tong)時(shí)該(gai)閥(fa)門具(ju)有良(liang)好的流(liu)體(ti)控(kong)制特(te)性。蝶(die)閥處(chu)於(yu)*開(kai)啟(qi)位(wei)置(zhi)時(shí)(shi)，蝶(die)板厚(hou)度是介(jie)質(zhì)(zhi)流經(jīng)閥體(ti)時(shí)(shi)*的阻(zu)力(li)，因(yin)此通(tong)過(guo)該閥門所(suo)產(chǎn)(chan)生(sheng)的壓力降(jiang)很(hen)小(xiao)，故(gu)具(ju)有較(jiao)好的流(liu)量(liang)控制(zhi)特性。蝶(die)閥有彈(dan)密封(feng)和金(jin)屬(shu)的密(mi)封(feng)兩(liang)種密(mi)封(feng)型式。彈(dan)性密封(feng)閥(fa)門，密(mi)封圈可(ke)以鑲嵌(qian)在閥(fa)體(ti)上(shang)或(huo)附在蝶(die)板周(zhou)邊。采(cai)用(yong)金(jin)屬(shu)密(mi)封(feng)的閥(fa)門(men)壹(yi)般(ban)比(bi)彈(dan)性密封(feng)的閥(fa)門(men)壽命長(chang)，但(dan)很(hen)難(nan)做(zuo)到(dao)*密(mi)封(feng)。
VICKERS換(huan)向閥由(you)手(shou)柄(bing)驅(qū)(qu)動，通(tong)過(guo)手(shou)柄(bing)帶(dai)動閥桿(gan)與(yu)凸輪(lun)旋轉(zhuǎn)(zhuan)，凸(tu)輪具(ju)有定(ding)位(wei)驅(qū)(qu)動與(yu)鎖(suo)定(ding)密(mi)封組件(jian)的開(kai)啟(qi)與關(guān)(guan)閉(bi)功(gong)能。手(shou)柄(bing)逆(ni)時(shí)針旋轉(zhuǎn)(zhuan)，兩(liang)組密(mi)封(feng)組件(jian)分別(bie)在(zai)凸輪的作(zuo)用(yong)下關(guān)(guan)閉(bi)下端的兩(liang)個(gè)(ge)通(tong)道，上(shang)端(duan)的兩(liang)個(gè)(ge)通(tong)道分別(bie)與(yu)管道裝置(zhi)的進(jìn)(jin)口(kou)相通。反(fan)之(zhi)，上(shang)端(duan)的兩(liang)個(gè)(ge)通(tong)道關(guān)閉(bi)，下端兩個(gè)通道與管(guan)道裝置(zhi)的進(jìn)(jin)口(kou)相通，實(shí)(shi)現(xiàn)(xian)了不停(ting)車(che)換(huan)向。
VICKERS換(huan)向閥出來的先(xian)導(dǎo)油(you)控(kong)制主換(huan)向閥閥芯(xin)的移(yi)動(dong)，使(shi)工(gong)作(zuo)泵(beng)的來油進(jìn)(jin)入(ru)動臂(bi)油(you)缸(gang)實(shí)(shi)現(xiàn)(xian)動臂(bi)上(shang)升(sheng)。比例(li)先導(dǎo)減壓閥的輸(shu)出壓力越(yue)大(da)，控制主換(huan)向閥閥芯(xin)的位(wei)移(yi)越(yue)大(da)，主換(huan)向閥通過(guo)的流(liu)量(liang)越大(da)，動臂(bi)上(shang)升(sheng)的速(su)度(du)越(yue)快。當(dāng)(dang)操(cao)作手(shou)柄(bing)拉(la)限位(wei)置(zhi)時(shí)(shi)，手(shou)柄(bing)中(zhong)的限位(wei)電磁鐵(tie)通電，手(shou)柄(bing)在(zai)極(ji)限位(wei)置(zhi)被(bei)吸(xi)合。動(dong)臂(bi)以zui大的速(su)度(du)上(shang)升(sheng)，當(dāng)升(sheng)至動(dong)臂(bi)上(shang)位(wei)限位(wei)開(kai)關(guān)(guan)所(suo)限定(ding)的位(wei)置(zhi)時(shí)(shi)，操(cao)作手(shou)柄(bing)限位(wei)電磁鐵(tie)斷電，手(shou)柄(bing)自(zi)動恢(hui)復(fù)(fu)到(dao)中(zhong)位(wei)，動(dong)臂(bi)就(jiu)可(ke)保持在所限定(ding)的位(wei)置(zhi)。在(zai)動(dong)臂(bi)上(shang)升(sheng)的過(guo)程(cheng)中(zhong)，若需(xu)要(yao)動(dong)臂(bi)在(zai)某壹(yi)位(wei)置(zhi)停(ting)留，則(ze)需(xu)將操作(zuo)手(shou)柄(bing)退(tui)回中位(wei)。
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