力士乐先导溢流阀DB20G2-5X/50溢流阀一般有两种结构：1、直动型溢流阀 。2、先导式溢流阀。 对溢流阀的主要要求：调压范围大，调压偏差小，压力振摆小，动作灵敏，过载能力大，噪声小。 1）电磁溢流阀原理上，一般是由先导式溢流阀加上一个2位2通电磁阀组成。 2）这个电磁阀实际上由两部分组成：2位2通的液压阀部分，加上一个电磁铁。2位2通阀是开通，还是关闭，是由电磁铁推动阀芯运动来实现的。像楼上朋友讲的，有的阀电磁铁通电时打开，有的阀电磁铁断电时打开，萝目青菜个人各爱（根据系统要求选择）。也就是说，电磁阀这里有一条通路一头与先导溢流阀的某个部位相连，另一头通过油管与油箱相连。通过操作电磁铁可以让先导溢流阀的某个部位或者与油箱相通，或者不与油箱相通。 3）先导溢流阀的主阀上腔压力，是由先导阀加于控制的。如果先导阀正常工作，即主阀上腔有先导阀规定的压力，则整个溢流阀就会在系统压力到达调定压力时其主阀口打开一定的开度，一方面能将系统多余流量流回油箱，另一方面又能维持系统的压力为先导阀的调定值。可见，先导阀主要管压力，主阀服从先导阀的领导，在先导阀动作时将主阀口开到合适大小，正好将多余流量流出去，又不影响系统压力。 4）如果先导阀不调什么压力，也就是说主阀上腔没有先导阀控制的压力，这样主阀芯就解放了，由于没有来自上腔调压力，阀口就开到最da，油源来的油不再进入系统而以尽可能低的卸荷压力流回油箱。 5）可见定差溢流阀中的电磁阀，仅仅在系统卸荷时（液压阀部分）流过1－2升/分的先导流量，而浩浩荡荡的主流量还是通过主阀口流回油箱。 DB10G.-4X/...W65 DB10G.-5X/... DB10G1-4X/100XW65 DB10G1-4X/200W65 DB10G1-4X/315W65 DB10G1-4X/50UW65 DB10G1-5X/100 DB10G1-5X DB10G1-5X/200 DB10G1-5X/315X DB10G1-5X/315XY DB10G1-5X/350 DB10G2-4X/100W65 DB10G2-4X/100VW65 DB10G2-4X/100XW65 DB10G2-4X/200W65 DB10G2-4X/200VW65 DB10G2-4X/200V/12W65 DB10G2-4X/200XW65 DB10G2-4X/200XYW65 DB10G2-4X/200YW65 DB10G2-4X/315W65 DB10G2-4X/315/2W65 DB10G2-4X/315XW65 DB10G2-4X/315XYW65 DB10G2-4X/350W65 DB10G2-4X/350XYW65 DB10G2-4X/350YW65 DB10G2-4X/50W65 DB10G2-4X/50/12W65 DB10G2-4X/50VW65 DB10G2-5X/100 DB10G2-5X/100Y DB10G2-5X/200 DB10G2-5X/200P180 DB10G2-5X/200YV DB10G2-5X/250E DB10G2-5X/315 DB10G2-5X/315U/12 DB10G2-5X/315X DB10G2-5X/315XU DB10G2-5X DB10G2-5X/50 DB10G2-5X/50-40 DB10G2-5X/50Y DB10G2-5X/50YV DB10G2-5X=50U DB10G3-4X/100W65 DB10G3-4X/200YW65 DB10G3-5X/200 DB10G3-5X/50YU DB10G7-4X/315XYW65 DB10K1-4X/100Y DB10K1-4X/100YV DB10K1-4X/315Y DB10K1-4X/315YV DB10K2-4X/100XY DB10K2-4X/100Y DB10K2-4X/100YV DB10K2-4XYV DB10K2-4X/200XY DB10K2-4X/200Y DB10K2-4X/200YMIL15 DB10K2-4X/200YV DB10K2-4X/315XY DB10K2-4X/315Y DB10K2-4X/315YMIL15 DB10K2-4X/315YV DB10K2-4X/350YV DB10K2-4X/50Y DB10K2-4X/50YV DB10K3-4XYV DB10K3-4X/200Y DB10K3-4X/200YV DB10K3-4X/315YV DB10K7-4X/100XY DB10K7-4X/100YV DB10-.-4X/...W65 DB10-.-5X/... DB10-1-4X/100W65 DB20G.-4X/...W65 DB20G.-5X/... DB20G1-4X/100W65 DB20G1-4X/200W65 DB20G1-4X/315W65 DB20G1-4X/350W65 DB20G1-4X/350XW65 DB20G1-4X/50W65 DB20G1-4X/50UW65 DB20G1-5X/200 DB20G1-5X/315 DB20G1-5X/315U DB20G1-5X/315Y DB20G1-5X/350 DB20G1-5X/50 DB20G2-4X/100W65 DB20G2-4X/100-40W65 DB20G2-4X/100VW65 DB20G2-4X/100V/12W65 DB20G2-4X/100XW65 DB20G2-4X/200W65 DB20G2-4X/200XUW65 DB20G2-4X/200XYW65 DB20G2-4X/200YW65 DB20G2-4X/315W65 DB20G2-4X/315/12W65 DB20G2-4X/315XW65 DB20G2-4X/315XUW65 DB20G2-4X/315XYW65 DB20G2-4X/315YW65 DB20G2-4X/315Y/12W65 DB20G2-4X/350W65 DB20G2-4X/350VW65 DB20G2-4X/350XW65 DB20G2-4X/350X/12W65 DB20G2-4X/350XYW65 DB20G2-4X/50W65 DB20G2-4X/50UW65 DB20G2-4X/50V/12W65 DB20G2-4X/50YW65 DB20G2-4X/50YVW65 DB20G2-5X/100 DB20G2-5X/100Y DB20G2-5X/150E DB20G2-5X/200 DB20G2-5X DB20G2-5X/200E DB20G2-5X/200U DB20G2-5X/200V DB20G2-5X/200X DB20G2-5X/200Y DB20G2-5X/210E DB20G2-5X/250E DB20G2-5X/315 DB20G2-5X DB20G2-5X/315U DB20G2-5X/315X DB20G2-5X/315XU DB20G2-5X/350 DB20G2-5X/350X DB20G2-5X/350XY DB20G2-5X/50 DB20G2-5X/50V DB20G2-5X/50Y DB20G2-5X=50YU DB20G3-4X/200W65 DB20G3-4X/200YW65 DB20G7-5X/200YV DB20G7-5X/315XY DB20K1-1X/100XY DB20K1-1X/100XYV DB20K1-1X/100Y DB20K1-1X/180YE DB20K1-1X/200XY DB20K1-1X/200XYV DB20K1-1X/200Y DB20K1-1X/200YV DB20K1-1X/315XY DB30G.-5X/... DB30G1-5X/315 DB30G1-5X/315U DB30G2-5X/100 DB30G2-5X/100J DB30G2-5X/100U DB30G2-5X/100XU DB30G2-5X/100XYSO572 DB30G2-5X/100Y DB30G2-5X/200 DB30G2-5X/200V/12 DB30G2-5X/315 DB30G2-5X DB30G2-5X/315U DB30G2-5X/315U/12 DB30G2-5X/315X DB30G2-5X/315XY DB30G2-5X/315Y DB30G2-5X/350 DB30G2-5X/350XY DB30G2-5X/50 DB30G2-5X/50P15V DB30G2-5X/50YU DB30G2N5X/100P65 DB30G2N5X/100YE DB30G2N5X/150YE DB30G2N5X/160E DB30G2N5X/180E DB30G2N5X/200 DB30G2N5X/230E DB30G2N5X/250YE DB30G2N5X/30E DB30G2N5X/315YE DB30G2N5X/50 DB30G2N5X/50P15 DB30G2N5X/50P7Y DB30G2N5X/50U DB30G2N5X/50V DB30G7N5X/50YU DB30-.-5X/... DB30-1-5X/100 DB30-1-5X/100U DB30-1-5X/100V DB30-1-5X/100X DB30-1-5X/100Y DB30-1-5X/100YU DB30-1-5X/200 DB30-1-5X/200X DB30-1-5X/315 DB30-1-5X/315U DB30-1-5X/315V DB30-1-5X/315X DB30-1-5X/315XU DB30-1-5X/315XY DB30-1-5X/315XYSO283 DB30-1-5X/350 DB30-1-5X/350X DB30-1-5X/50 DB30-1-5X/50U DB30-1-5X/50XY DB30-1N5X/100 DB30-1N5X/300YE DB30-1N5X/50YE DB30-2-5X/100 DB30-2-5X/100U DB30-2-5X/100U/12 DB30-2-5X/100V DB30-2-5X/100X DB30-2-5X/100XU DB30-2-5X/100XYU DB30-2-5X/100Y DB30-2-5X/100YU DB30-2-5X/200 DB30-2-5X DB30-2-5X DB30-2-5X/200X DB30-2-5X/200XY DB30-2-5X/200Y DB30-2-5X/315 DB30-2-5X