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武穴黎翔机电设备有限公司，询价联系人：何女士
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行元件动作。油泵产生的压力先推动液压缸1运动，同时通过顺序阀的进油口作用在面积A上，当液压缸1运动完全成后，压力升高，作用在面积A的向上推力大於弹簧的调定值后，阀芯上升使进油口与出油口相通，使液压缸2运动。
流量控制阀利用调节阀芯和阀体间的节流口面积和它所产生的局部阻力对流量进行调节，从而控制执行元件的运动速度。流量控制阀按用途分为5种。
(1)节流阀：在调定节流口面积后，能使载荷压力变化不大和运动均匀性要求不高的执行元件的运动速度基本上保持稳定。
(2)调速阀：在载荷压力变化时能保持节流阀的进出口压差为定值。这样，在节流口面积调定以后，不论载荷压力如何变化，调速阀都能保持通过节流阀的流量不变，从而使执行元件的运动速度稳定。
(3)分流阀：不论载荷大小，能使同一油源的两个执行元件得到相等流量的为等量分流阀或同步阀;得到按比例分配流量的为比例分流阀。
(4)集流阀：作用与分流阀相反，使流入集流阀的流量按比例分配。
(5)分流集流阀：兼具分流阀和集流阀两种功能。方向控制阀按用途分为单向阀和换向阀。
单向阀：只允许流体在管道中单向接通，反向即切断。
换向阀：改变不同管路间的通断关系。根据阀芯在阀体中的工作位置数分两位、三位等;根据所控制的通道数分两通、三通、四通、五通等;根据阀芯驱动方式分手动、机动、电动、液动等。图2为三位四通换向阀的工作原理。P为供油口，O为回油口，A 、B是通向执行元件的输出口。当阀芯处於中位时，全部油口切断，执行元件不动;当阀芯移到右位时，P与A通，B与O通;当阀芯移到左位时，P与B通，A与O通。这样，执行元件就能作正、反向运动。
真空泵系统的阀门选择直接影响到真空泵的真空度，影响泵的工作性能。接下来深圳真空泵为大家介绍几种真空泵常用阀门。
球阀：
聚四氟乙烯阀座，这类阀门的冷工作压力应该为600psi
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