电磁换向阀和电液换向阀1.结构和工作原理WE型电磁换向阀采用湿式交流或直流电磁铁。该阀是通过电磁铁控制阀芯的不同工作位置。当电磁铁断电时，阀芯靠弹簧压力保持在中间或终端位置(脉冲式阀除外)。电磁铁通电，阀芯被推到工作位置上，断电后又恢复到初始状态。这时用手推动故障检查按钮可使阀芯移动。由于湿式电磁铁内部与回油腔相通，这样衔铁油里移动，可以减少磨损、缓冲，并且提高了散热性能，提高了使用寿命。交流电磁铁具有动作时间短，电气控制线路简单，不需特殊的触头保护等特点。直流电磁铁是切换特性软，动作频率高，对过载或低电压反应不敏感，工作可靠。WE型换向阀是由电磁铁控制的滑阀式换向阀，它主要用于控制液体的通断和流动方向。其结构主要是由阀体、电磁铁、滑阀以及复位弹簧等组成。在不通电的情况下被复位弹簧保持在中间位置或初始位置上(脉冲阀除外)。电磁铁的推力通过推杆作用在滑阀上，并且把它从静止位置推到工作位置上(终端位置)，由此改变了液流的方向P→A和B→T或者P→B和A→T。当电磁铁断电后，滑阀被复位弹簧重新推到原来的静止位置上。在电磁铁断电时，用故障检查按钮推动滑阀移动。WEH型换向阀WEH型换向阀是由电磁阀作为先导控制的滑阀工换向阀。用于控制液流的通断和流动方向。换向阀是由主阀体、主阀芯、-个或二个复位弹簧和带一个或二个电磁铁的先导阀组成。主阀芯借助于弹簧力或液压力保持中间位置。先导阀可选择湿式直流(或交流)电磁铁，用先导阀的控制油使主阀芯换向(移位)。当电磁铁不通电时，推动故障检查按钮可导阀芯移动。控制油的输入与输出可选用内控或外控。弹簧对中的三位四通换向阀( 4WEH25,, 60/,型)主阀芯是靠两个弹簧保持在中间位置，两弹簧腔与导阀T腔相通(无背压)。控制油从通道引入供给先导阀，当先导阀换向后控制油作用在主阀芯两端中的一端上，推动主阀芯换向，从而使各油口按滑阀机能接通。当电磁铁断电时，导阀芯回到初始位置(脉冲阀除外)，控制油腔通过导阀T腔与油箱接通，在弹簧力的作用下，主阀芯回到中间位置。弹簧内的控制油经先导阀T腔或外排口Y排出。压力对中的三位四通换向阀(4WEH25H,,60/,型)在这种结构中是通过压力油作用在主阀芯的两端面上，由阀体内的定位套使主阀芯保持在中间位置上。如果主阀芯一端卸荷，则主阀换向，使相应的油口接通;此卸荷端的控制油通过先导阀通过通道Y排出。二位四通换向阀有4种不同的结构1.4WEH,, /,型:先导阀和主阀中各有一个复位弹簧(当电磁铁断电时，使主阀芯固定在初始位置上)2.4WEH，H/,, /,型:先导阀有一个复位弹簧，由它来控制导阀芯保持在初始位置上。3.4WEH,, H，/0.,型: 先导阀有两个电磁铁。在先导阀和主阀里都没有复位弹簧，在这种情况下分别由电磁铁和压力油的同时作用下使主阀芯换向。因此就总有一个电磁铁处于工作状态。4.4WEH, H/,, /0F,型:先导阀有两个电磁铁，可使阀芯停在某个工作位置上(脉冲式阀)。主阀上没有定位器，是在压力油作用下移到相应的工作位置。在上述结构中，主阀芯只有在控制油作用下才能正常动作。型号H.4WEH25,, 60/,, 6A,:在这种结构里控制油是外供外排型的。控制没从外排口X引入，并通过外排Y排出。力士乐电磁阀4WE6E70/HG24N9K4
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