寶德BURKERT防水錘電磁閥

BURKERT防水(shui)錘電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)閥(fa)(fa)是(shi)(shi)(shi)利用(yong)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)推動(dong)閥(fa)(fa)芯(xin)來(lai)控制(zhi)液流(liu)方(fang)向(xiang)的(de)(de)(de)。采用(yong)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)換(huan)向(xiang)閥(fa)(fa)可(ke)以(yi)(yi)使操(cao)作輕便，容易實現自(zi)動(dong)化操(cao)作，因(yin)此應(ying)用(yong)極廣(guang)。電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)換(huan)向(xiang)閥(fa)(fa)只是(shi)(shi)(shi)采用(yong)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)來(lai)操(cao)縱滑閥(fa)(fa)閥(fa)(fa)芯(xin)運動(dong)，而(er)(er)閥(fa)(fa)芯(xin)的(de)(de)(de)結(jie)構及型式可(ke)以(yi)(yi)是(shi)(shi)(shi)各(ge)種各(ge)樣(yang)的(de)(de)(de)，所以(yi)(yi)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)滑閥(fa)(fa)可(ke)以(yi)(yi)是(shi)(shi)(shi)二位(wei)(wei)二通、二位(wei)(wei)三(san)(san)通、二位(wei)(wei)四通、三(san)(san)位(wei)(wei)四通和三(san)(san)位(wei)(wei)五(wu)通等(deng)多(duo)種型式。般二位(wei)(wei)閥(fa)(fa)用(yong)個(ge)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)，三(san)(san)位(wei)(wei)閥(fa)(fa)需用(yong)兩個(ge)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)。操(cao)縱電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)閥(fa)(fa)用(yong)的(de)(de)(de)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)分為交、直(zhi)流(liu)兩種，交流(liu)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)的(de)(de)(de)電(dian)(dian)(dian)(dian)壓般為220伏。其特(te)點是(shi)(shi)(shi)啟(qi)動(dong)力(li)較(jiao)大(da)，換(huan)向(xiang)時(shi)間短，價廉(lian)。但(dan)當閥(fa)(fa)芯(xin)卡住(zhu)或吸力(li)不夠而(er)(er)使鐵(tie)(tie)(tie)芯(xin)吸不上(shang)時(shi)，電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)容易因(yin)電(dian)(dian)(dian)(dian)流(liu)過(guo)大(da)而(er)(er)燒(shao)壞，故工作可(ke)靠性較(jiao)差，動(dong)作時(shi)有沖擊(ji)，壽命較(jiao)低。直(zhi)流(liu)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)電(dian)(dian)(dian)(dian)壓般為24伏。其優點是(shi)(shi)(shi)工作可(ke)靠，不會因(yin)閥(fa)(fa)芯(xin)卡住(zhu)而(er)(er)燒(shao)壞，壽命長，體積小(xiao)(xiao)，但(dan)啟(qi)動(dong)力(li)較(jiao)交流(liu)電(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)鐵(tie)(tie)(tie)小(xiao)(xiao)，而(er)(er)且在無直(zhi)流(liu)電(dian)(dian)(dian)(dian)源時(shi)，需整流(liu)設備。

寶德BURKERT防水錘電磁閥
BURKERT防水錘電磁閥的流量恒定呢?其工作原理如圖6.18所示。它的導以固定節流孔I作為流量傳感器（Flow Sensor），將流量轉化為I上的壓力差后與彈簧力平衡，壓差恒定時流量自然恒定。通過可變節流口Ⅱ，可以自動調節流量。流量大時，流量傳感器（固定節流孔I）的壓差則大，該壓差作用在活塞6上，壓縮彈簧，關小可變節流口Ⅱ，將導的流量向減小的方向調節；反之則增大可變節流口Ⅱ，將導的流量向增大的方向調節。總之自動維持導流量穩定。因此這種閥的出口壓力p2，與閥的進口壓力p1 ，以及流經主閥的流量無關。如果閥的出口壓力出現沖擊，主閥芯上的單向閥4將迅速開啟卸壓，使閥的出口壓力很快降低。在出口壓力恢復到調定值后，單向閥重新關閉。故單向閥在這里起壓力緩沖作用。
BURKERT防水錘電磁閥進口壓力p1未經穩壓，壓力波動可能較大，又不利于導的控制。為了減小p1波動可能帶來的不利影響，保證導的控制精度，可以在導進口處用個小型“恒流器”（Constant Flow Regulation）代替原固定節流孔，通過“恒流器”的調節作用使導的流量及導閥開口度近似恒定，結果使有利于提高主閥上腔壓力p3的穩壓精度。圖6.19所示就是種導由減壓進口供油的減壓閥。該閥導進口處設有“控制油流量恒定器”6，它由個固定節流孔I和個可變節流口Ⅱ串聯而成。可變節流口借助于個可以軸向移動的小活塞來改變通油孔N的過流面積，從而改變液阻。小活塞左端的固定節流孔，使小活塞兩端出現壓力差。小活塞在此壓力差和右端彈簧的共同作用下而處于某平衡位置。
德國BURKERT防水錘電磁閥,寶德防水錘電磁閥
BURKERT防水錘電磁閥(fa)(fa)(fa)可以設計成隨著(zhu)它被(bei)供給能量或(huo)(huo)失(shi)去(qu)能量而(er)使(shi)(shi)(shi)主閥(fa)(fa)(fa)開啟（排放）的兩(liang)種(zhong)形式(shi)。若采(cai)用(yong)(yong)供能釋放原(yuan)理(li)，當萬發生(sheng)事故而(er)失(shi)去(qu)能量時，將(jiang)使(shi)(shi)(shi)主閥(fa)(fa)(fa)保(bao)持關閉。因此，在(zai)這種(zhong)場(chang)合使(shi)(shi)(shi)用(yong)(yong)的導(dao)式(shi)安全閥(fa)(fa)(fa)采(cai)用(yong)(yong)系統介質(zhi)作(zuo)(zuo)(zuo)為操(cao)(cao)(cao)作(zuo)(zuo)(zuo)介質(zhi)是zui安全的。不(bu)過(guo)，某些(xie)規范(fan)也允許采(cai)用(yong)(yong)外部操(cao)(cao)(cao)作(zuo)(zuo)(zuo)介質(zhi)，只要(yao)這些(xie)操(cao)(cao)(cao)作(zuo)(zuo)(zuo)介質(zhi)系由(you)幾個獨(du)立的能源供給，或(huo)(huo)者只要(yao)導(dao)式(shi)安全閥(fa)(fa)(fa)的載荷是有(you)限的。若采(cai)用(yong)(yong)失(shi)能釋放原(yuan)理(li)，失(shi)能將(jiang)使(shi)(shi)(shi)主閥(fa)(fa)(fa)開啟。于是在(zai)這種(zhong)情況下(xia)，導(dao)閥(fa)(fa)(fa)的失(shi)效保(bao)護操(cao)(cao)(cao)作(zuo)(zuo)(zuo)將(jiang)不(bu)受操(cao)(cao)(cao)作(zuo)(zuo)(zuo)介質(zhi)的影(ying)響。